From f799f7465ae46d4ce0d368555683f5bf0232678a Mon Sep 17 00:00:00 2001
From: Marian Buschsieweke <marian.buschsieweke@ml-pa.com>
Date: Wed, 19 Nov 2025 17:47:59 +0100
Subject: [PATCH 1/2] tests/unittests: use SPDX copyright tags
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: crasbe <crasbe@gmail.com>
Co-authored-by: Ann🐸 <git@annsann.eu>
---
 tests/unittests/common/unittests-constants.h  |  7 ++---
 tests/unittests/map.h                         | 27 ++-----------------
 .../tests-analog_util/tests-analog_util.c     |  7 ++---
 .../tests-analog_util/tests-analog_util.h     |  7 ++---
 tests/unittests/tests-base64/tests-base64.c   |  9 +++----
 tests/unittests/tests-base64/tests-base64.h   |  7 ++---
 tests/unittests/tests-bcd/tests-bcd.c         |  7 ++---
 tests/unittests/tests-bcd/tests-bcd.h         |  7 ++---
 .../tests-bhp_event/tests-bhp_event.c         |  7 ++---
 .../tests-bhp_event/tests-bhp_event.h         |  7 ++---
 tests/unittests/tests-bhp_msg/tests-bhp_msg.c |  7 ++---
 tests/unittests/tests-bhp_msg/tests-bhp_msg.h |  7 ++---
 .../unittests/tests-bitfield/tests-bitfield.c |  9 +++----
 .../unittests/tests-bloom/tests-bloom-sets.h  |  7 ++---
 tests/unittests/tests-bloom/tests-bloom.c     | 10 +++----
 tests/unittests/tests-bloom/tests-bloom.h     |  7 ++---
 tests/unittests/tests-bluetil/tests-bluetil.c |  7 ++---
 tests/unittests/tests-bluetil/tests-bluetil.h |  7 ++---
 .../tests-checksum-crc16-ccitt-aug.c          |  7 ++---
 .../tests-checksum-crc16-ccitt-false.c        |  7 ++---
 .../tests-checksum-crc16-ccitt-fcs.c          |  8 +++---
 .../tests-checksum-crc16-ccitt-kermit.c       |  7 ++---
 .../tests-checksum-crc16-ccitt-mcrf4xx.c      |  7 ++---
 .../tests-checksum/tests-checksum-crc32.c     |  7 ++---
 .../tests-checksum/tests-checksum-crc8-lsb.c  |  7 ++---
 .../tests-checksum/tests-checksum-crc8.c      |  7 ++---
 .../tests-checksum-fletcher16.c               |  7 ++---
 .../tests-checksum-fletcher32.c               |  7 ++---
 .../tests-checksum/tests-checksum-ucrc16.c    |  7 ++---
 .../unittests/tests-checksum/tests-checksum.c |  7 ++---
 .../unittests/tests-checksum/tests-checksum.h |  7 ++---
 .../tests-chunked_ringbuffer.c                |  7 ++---
 tests/unittests/tests-clif/tests-clif.c       |  9 +++----
 tests/unittests/tests-clif/tests-clif.h       |  7 ++---
 .../unittests/tests-coding/tests-coding-xor.c |  7 ++---
 tests/unittests/tests-coding/tests-coding.c   |  7 ++---
 tests/unittests/tests-coding/tests-coding.h   |  7 ++---
 tests/unittests/tests-color/tests-color.c     |  7 ++---
 tests/unittests/tests-color/tests-color.h     |  7 ++---
 .../unittests/tests-core/tests-core-atomic.c  |  9 +++----
 .../tests-core/tests-core-bitarithm.c         |  7 ++---
 .../tests-core/tests-core-byteorder.c         |  7 ++---
 tests/unittests/tests-core/tests-core-cib.c   |  7 ++---
 tests/unittests/tests-core/tests-core-clist.c |  7 ++---
 tests/unittests/tests-core/tests-core-list.c  |  7 ++---
 .../unittests/tests-core/tests-core-macros.c  |  7 ++---
 tests/unittests/tests-core/tests-core-mbox.c  |  7 ++---
 .../tests-core/tests-core-priority-queue.c    |  8 +++---
 .../tests-core/tests-core-ringbuffer.c        | 17 ++----------
 .../tests-core/tests-core-xfa-data1.c         |  7 ++---
 .../tests-core/tests-core-xfa-data2.c         |  7 ++---
 tests/unittests/tests-core/tests-core-xfa.c   |  7 ++---
 tests/unittests/tests-core/tests-core-xfa.h   |  7 ++---
 tests/unittests/tests-core/tests-core.c       |  7 ++---
 tests/unittests/tests-core/tests-core.h       |  7 ++---
 tests/unittests/tests-credman/credentials.h   |  7 ++---
 tests/unittests/tests-credman/tests-credman.c |  7 ++---
 tests/unittests/tests-credman/tests-credman.h |  7 ++---
 tests/unittests/tests-div/tests-div.c         |  9 +++----
 tests/unittests/tests-div/tests-div.h         |  7 ++---
 .../tests-dns_cache/tests-dns_cache.c         |  7 ++---
 .../tests-dns_cache/tests-dns_cache.h         |  7 ++---
 tests/unittests/tests-dns_msg/tests-dns_msg.c |  7 ++---
 tests/unittests/tests-dns_msg/tests-dns_msg.h |  7 ++---
 tests/unittests/tests-ecc/tests-ecc.c         |  7 ++---
 tests/unittests/tests-fib/tests-fib.c         |  9 +++----
 tests/unittests/tests-fib/tests-fib.h         |  7 ++---
 tests/unittests/tests-fib_sr/tests-fib_sr.c   |  7 ++---
 tests/unittests/tests-fib_sr/tests-fib_sr.h   |  7 ++---
 tests/unittests/tests-fmt/tests-fmt.c         |  7 ++---
 tests/unittests/tests-fmt/tests-fmt.h         |  7 ++---
 tests/unittests/tests-frac/tests-frac.c       |  7 ++---
 tests/unittests/tests-frac/tests-frac.h       |  7 ++---
 tests/unittests/tests-gcoap/tests-gcoap.c     |  7 ++---
 tests/unittests/tests-gcoap/tests-gcoap.h     |  7 ++---
 .../tests-gnrc_ipv6/tests-gnrc_ipv6.c         |  7 ++---
 .../tests-gnrc_ipv6/tests-gnrc_ipv6.h         |  7 ++---
 .../tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.c |  7 ++---
 .../tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.h |  7 ++---
 .../tests-gnrc_ipv6_nib-abr.c                 |  7 ++---
 .../tests-gnrc_ipv6_nib-ft.c                  |  7 ++---
 .../tests-gnrc_ipv6_nib-internal.c            |  7 ++---
 .../tests-gnrc_ipv6_nib-nc.c                  |  7 ++---
 .../tests-gnrc_ipv6_nib-pl.c                  |  7 ++---
 .../tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib.c |  7 ++---
 .../tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib.h |  7 ++---
 .../tests-gnrc_netif_pktq.c                   |  7 ++---
 .../tests-gnrc_netif_pktq.h                   |  7 ++---
 .../tests-gnrc_sixlowpan_frag_vrb.c           |  7 ++---
 .../tests-gnrc_sixlowpan_frag_vrb.h           |  7 ++---
 .../unittests/tests-gnrc_udp/tests-gnrc_udp.c |  7 ++---
 .../unittests/tests-gnrc_udp/tests-gnrc_udp.h |  7 ++---
 .../tests-hashes/tests-hashes-aes128_cmac.c   |  7 ++---
 .../unittests/tests-hashes/tests-hashes-md5.c |  7 ++---
 .../tests-hashes/tests-hashes-sha1.c          |  7 ++---
 .../tests-hashes/tests-hashes-sha224.c        |  9 +++----
 .../tests-hashes/tests-hashes-sha256-chain.c  |  9 +++----
 .../tests-hashes/tests-hashes-sha256-hmac.c   |  9 +++----
 .../tests-hashes/tests-hashes-sha256.c        | 13 ++++-----
 .../tests-hashes/tests-hashes-sha3.c          |  7 ++---
 .../tests-hashes/tests-hashes-sha384.c        |  9 +++----
 .../tests-hashes/tests-hashes-sha512.c        |  9 +++----
 .../tests-hashes/tests-hashes-sha512_224.c    |  9 +++----
 .../tests-hashes/tests-hashes-sha512_256.c    |  9 +++----
 tests/unittests/tests-hashes/tests-hashes.c   |  7 ++---
 tests/unittests/tests-hashes/tests-hashes.h   |  7 ++---
 .../tests-ieee802154/tests-ieee802154.c       |  7 ++---
 .../tests-ieee802154/tests-ieee802154.h       |  7 ++---
 .../tests-inet_csum/tests-inet_csum.c         |  7 ++---
 .../tests-inet_csum/tests-inet_csum.h         |  7 ++---
 .../tests-ipv4_addr/tests-ipv4_addr.c         |  7 ++---
 .../tests-ipv4_addr/tests-ipv4_addr.h         |  7 ++---
 .../tests-ipv6_addr/tests-ipv6_addr.c         |  7 ++---
 .../tests-ipv6_addr/tests-ipv6_addr.h         |  7 ++---
 .../unittests/tests-ipv6_hdr/tests-ipv6_hdr.c |  9 +++----
 .../unittests/tests-ipv6_hdr/tests-ipv6_hdr.h |  7 ++---
 .../tests-isrpipe-read_timeout.c              |  7 ++---
 tests/unittests/tests-isrpipe/tests-isrpipe.c |  7 ++---
 tests/unittests/tests-isrpipe/tests-isrpipe.h |  7 ++---
 .../tests-kernel_defines.c                    |  7 ++---
 .../tests-kernel_defines.h                    |  7 ++---
 tests/unittests/tests-libc/tests-libc.c       |  7 ++---
 tests/unittests/tests-libc/tests-libc.h       |  7 ++---
 tests/unittests/tests-luid/tests-luid.c       |  7 ++---
 tests/unittests/tests-luid/tests-luid.h       |  7 ++---
 tests/unittests/tests-matstat/tests-matstat.c |  7 ++---
 tests/unittests/tests-matstat/tests-matstat.h |  7 ++---
 tests/unittests/tests-mtd/tests-mtd.c         |  7 ++---
 tests/unittests/tests-mtd/tests-mtd.h         |  7 ++---
 .../unittests/tests-nanocoap/tests-nanocoap.c |  7 ++---
 .../tests-nanocoap_cache.c                    |  7 ++---
 .../tests-nanocoap_cache.h                    |  7 ++---
 tests/unittests/tests-netopt/tests-netopt.c   |  7 ++---
 tests/unittests/tests-netopt/tests-netopt.h   |  7 ++---
 tests/unittests/tests-netreg/tests-netreg.c   |  7 ++---
 tests/unittests/tests-netreg/tests-netreg.h   |  7 ++---
 tests/unittests/tests-phydat/tests-phydat.c   | 11 +++-----
 tests/unittests/tests-phydat/tests-phydat.h   |  9 +++----
 tests/unittests/tests-pkt/tests-pkt.c         |  9 +++----
 tests/unittests/tests-pkt/tests-pkt.h         |  7 ++---
 tests/unittests/tests-pktbuf/tests-pktbuf.c   |  9 +++----
 tests/unittests/tests-pktbuf/tests-pktbuf.h   |  7 ++---
 .../unittests/tests-pktqueue/tests-pktqueue.c |  7 ++---
 .../unittests/tests-pktqueue/tests-pktqueue.h |  7 ++---
 .../tests-printf_float/tests-printf_float.c   |  7 ++---
 .../tests-printf_float/tests-printf_float.h   |  7 ++---
 .../tests-priority_pktqueue.c                 |  7 ++---
 .../tests-priority_pktqueue.h                 |  7 ++---
 tests/unittests/tests-rtc/tests-rtc.c         |  7 ++---
 tests/unittests/tests-rtc/tests-rtc.h         |  7 ++---
 tests/unittests/tests-rtt_rtc/mock_rtt.c      |  7 ++---
 tests/unittests/tests-rtt_rtc/tests-rtt_rtc.c |  7 ++---
 tests/unittests/tests-rtt_rtc/tests-rtt_rtc.h |  7 ++---
 .../unittests/tests-saul_reg/tests-saul_reg.c |  7 ++---
 .../unittests/tests-saul_reg/tests-saul_reg.h |  7 ++---
 .../tests-scanf_float/tests-scanf_float.c     |  7 ++---
 .../tests-scanf_float/tests-scanf_float.h     |  7 ++---
 tests/unittests/tests-seq/tests-seq.c         |  7 ++---
 tests/unittests/tests-seq/tests-seq.h         |  7 ++---
 tests/unittests/tests-sht1x/tests-sht1x.c     |  7 ++---
 tests/unittests/tests-sht1x/tests-sht1x.h     |  7 ++---
 .../tests-sixlowpan/tests-sixlowpan.c         |  7 ++---
 .../tests-sixlowpan/tests-sixlowpan.h         |  7 ++---
 .../tests-sixlowpan_ctx/tests-sixlowpan_ctx.c |  7 ++---
 .../tests-sixlowpan_ctx/tests-sixlowpan_ctx.h |  7 ++---
 .../tests-sixlowpan_sfr/tests-sixlowpan_sfr.c |  7 ++---
 .../tests-sixlowpan_sfr/tests-sixlowpan_sfr.h |  7 ++---
 .../tests-sock_util/tests-sock_util.c         |  9 +++----
 .../tests-sock_util/tests-sock_util.h         |  9 +++----
 tests/unittests/tests-timex/tests-timex.c     |  9 +++----
 tests/unittests/tests-timex/tests-timex.h     |  7 ++---
 tests/unittests/tests-tsrb/tests-tsrb.c       |  7 ++---
 tests/unittests/tests-tsrb/tests-tsrb.h       |  7 ++---
 tests/unittests/tests-turo/tests-turo.c       |  8 +++---
 .../tests-unicoap/tests-unicoap-message.c     |  9 +++----
 .../tests-unicoap/tests-unicoap-options.c     |  9 +++----
 .../tests-unicoap/tests-unicoap-pdu.c         |  9 +++----
 tests/unittests/tests-unicoap/tests-unicoap.c |  9 +++----
 tests/unittests/tests-unicoap/tests-unicoap.h |  9 +++----
 .../tests-uri_parser/tests-uri_parser.c       |  8 +++---
 .../tests-uri_parser/tests-uri_parser.h       |  7 ++---
 .../tests-ut_process/tests-ut_process.c       |  7 ++---
 .../tests-ut_process/tests-ut_process.h       |  7 ++---
 tests/unittests/tests-uuid/tests-uuid.c       |  9 +++----
 tests/unittests/tests-uuid/tests-uuid.h       |  9 +++----
 tests/unittests/tests-vfs/tests-vfs-bind.c    |  7 ++---
 tests/unittests/tests-vfs/tests-vfs-dir-ops.c |  7 ++---
 .../unittests/tests-vfs/tests-vfs-file-ops.c  |  7 ++---
 .../tests-vfs/tests-vfs-file-system-ops.c     |  7 ++---
 .../tests-vfs/tests-vfs-mount-constfs.c       |  7 ++---
 .../tests-vfs/tests-vfs-normalize_path.c      |  7 ++---
 .../tests-vfs/tests-vfs-open-close.c          |  7 ++---
 tests/unittests/tests-vfs/tests-vfs.c         |  7 ++---
 tests/unittests/tests-vfs/tests-vfs.h         |  7 ++---
 tests/unittests/tests-zptr/tests-zptr.c       |  7 ++---
 tests/unittests/tests-zptr/tests-zptr.h       |  7 ++---
 .../tests-ztimer-convert-muldiv64.c           |  7 ++---
 .../tests-ztimer/tests-ztimer-mock.c          |  7 ++---
 .../tests-ztimer/tests-ztimer-ondemand.c      |  7 ++---
 tests/unittests/tests-ztimer/tests-ztimer.c   |  7 ++---
 tests/unittests/tests-ztimer/tests-ztimer.h   |  7 ++---
 .../tests-ztimer64/tests-ztimer64-core.c      |  4 +--
 .../unittests/tests-ztimer64/tests-ztimer64.c |  4 +--
 .../unittests/tests-ztimer64/tests-ztimer64.h |  4 +--
 204 files changed, 443 insertions(+), 1077 deletions(-)

diff --git a/tests/unittests/common/unittests-constants.h b/tests/unittests/common/unittests-constants.h
index 107130fd8aff..8abaa3686c85 100644
--- a/tests/unittests/common/unittests-constants.h
+++ b/tests/unittests/common/unittests-constants.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Philipp Rosenkranz <philipp.rosenkranz@fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Philipp Rosenkranz <philipp.rosenkranz@fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/map.h b/tests/unittests/map.h
index 1de257c1efa6..dd3b83f5d2c4 100644
--- a/tests/unittests/map.h
+++ b/tests/unittests/map.h
@@ -1,29 +1,6 @@
 /*
- * Copyright (C) 2012 William Swanson
- *
- * Permission is hereby granted, free of charge, to any person
- * obtaining a copy of this software and associated documentation
- * files (the "Software"), to deal in the Software without
- * restriction, including without limitation the rights to use, copy,
- * modify, merge, publish, distribute, sublicense, and/or sell copies
- * of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
- * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
- * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- * Except as contained in this notice, the names of the authors or
- * their institutions shall not be used in advertising or otherwise to
- * promote the sale, use or other dealings in this Software without
- * prior written authorization from the authors.
+ * SPDX-FileCopyrightText: 2012 William Swanson
+ * SPDX-License-Identifier: MIT
  */
 
 #pragma once
diff --git a/tests/unittests/tests-analog_util/tests-analog_util.c b/tests/unittests/tests-analog_util/tests-analog_util.c
index a9b2f631f077..d2f957760954 100644
--- a/tests/unittests/tests-analog_util/tests-analog_util.c
+++ b/tests/unittests/tests-analog_util/tests-analog_util.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include "embUnit.h"
diff --git a/tests/unittests/tests-analog_util/tests-analog_util.h b/tests/unittests/tests-analog_util/tests-analog_util.h
index 493bdf58ea31..b4c07ab53413 100644
--- a/tests/unittests/tests-analog_util/tests-analog_util.h
+++ b/tests/unittests/tests-analog_util/tests-analog_util.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-base64/tests-base64.c b/tests/unittests/tests-base64/tests-base64.c
index b57f4ea74c6c..6a6bc4e26557 100644
--- a/tests/unittests/tests-base64/tests-base64.c
+++ b/tests/unittests/tests-base64/tests-base64.c
@@ -1,10 +1,7 @@
 /*
-* Copyright (C) 2015 Martin Landsmann
-*
-* This file is subject to the terms and conditions of the GNU Lesser
-* General Public License v2.1. See the file LICENSE in the top level
-* directory for more details.
-*/
+ * SPDX-FileCopyrightText: 2015 Martin Landsmann
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
 
 #define TEST_BASE64_SHOW_OUTPUT (0) /**< set if encoded/decoded string is displayed */
 
diff --git a/tests/unittests/tests-base64/tests-base64.h b/tests/unittests/tests-base64/tests-base64.h
index 026ed571e941..3bb684d6f451 100644
--- a/tests/unittests/tests-base64/tests-base64.h
+++ b/tests/unittests/tests-base64/tests-base64.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martin Landsmann
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martin Landsmann
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-bcd/tests-bcd.c b/tests/unittests/tests-bcd/tests-bcd.c
index 51712e4d3a7a..26e426f8f029 100644
--- a/tests/unittests/tests-bcd/tests-bcd.c
+++ b/tests/unittests/tests-bcd/tests-bcd.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-bcd/tests-bcd.h b/tests/unittests/tests-bcd/tests-bcd.h
index 88bdf11e7a14..b666bee6dab0 100644
--- a/tests/unittests/tests-bcd/tests-bcd.h
+++ b/tests/unittests/tests-bcd/tests-bcd.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-bhp_event/tests-bhp_event.c b/tests/unittests/tests-bhp_event/tests-bhp_event.c
index ea92580357c8..20e4cc3d0e1f 100644
--- a/tests/unittests/tests-bhp_event/tests-bhp_event.c
+++ b/tests/unittests/tests-bhp_event/tests-bhp_event.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-bhp_event/tests-bhp_event.h b/tests/unittests/tests-bhp_event/tests-bhp_event.h
index dd88458f4636..89d5cd4a92b5 100644
--- a/tests/unittests/tests-bhp_event/tests-bhp_event.h
+++ b/tests/unittests/tests-bhp_event/tests-bhp_event.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-bhp_msg/tests-bhp_msg.c b/tests/unittests/tests-bhp_msg/tests-bhp_msg.c
index 193fc479aeb7..9b5ac2555a0d 100644
--- a/tests/unittests/tests-bhp_msg/tests-bhp_msg.c
+++ b/tests/unittests/tests-bhp_msg/tests-bhp_msg.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-bhp_msg/tests-bhp_msg.h b/tests/unittests/tests-bhp_msg/tests-bhp_msg.h
index 42561e97488d..6ce562c23bf6 100644
--- a/tests/unittests/tests-bhp_msg/tests-bhp_msg.h
+++ b/tests/unittests/tests-bhp_msg/tests-bhp_msg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-bitfield/tests-bitfield.c b/tests/unittests/tests-bitfield/tests-bitfield.c
index b29d30df1fb9..784c00e89322 100644
--- a/tests/unittests/tests-bitfield/tests-bitfield.c
+++ b/tests/unittests/tests-bitfield/tests-bitfield.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- *               2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-bloom/tests-bloom-sets.h b/tests/unittests/tests-bloom/tests-bloom-sets.h
index 907365b28f68..15bc5abbe9e6 100644
--- a/tests/unittests/tests-bloom/tests-bloom-sets.h
+++ b/tests/unittests/tests-bloom/tests-bloom-sets.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Philipp Rosenkranz
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Philipp Rosenkranz
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-bloom/tests-bloom.c b/tests/unittests/tests-bloom/tests-bloom.c
index b6452989fb07..ba2d2735c3ce 100644
--- a/tests/unittests/tests-bloom/tests-bloom.c
+++ b/tests/unittests/tests-bloom/tests-bloom.c
@@ -1,11 +1,9 @@
 /*
- * Copyright (C) 2014 Philipp Rosenkranz
- * Copyright (C) 2013 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Philipp Rosenkranz
+ * SPDX-FileCopyrightText: 2013 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
+
 #include <string.h>
 #include <stdio.h>
 
diff --git a/tests/unittests/tests-bloom/tests-bloom.h b/tests/unittests/tests-bloom/tests-bloom.h
index a7f62dd26b7a..90c62001b12a 100644
--- a/tests/unittests/tests-bloom/tests-bloom.h
+++ b/tests/unittests/tests-bloom/tests-bloom.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Philipp Rosenkranz
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Philipp Rosenkranz
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-bluetil/tests-bluetil.c b/tests/unittests/tests-bluetil/tests-bluetil.c
index f90d8815a841..6ac018f36abe 100644
--- a/tests/unittests/tests-bluetil/tests-bluetil.c
+++ b/tests/unittests/tests-bluetil/tests-bluetil.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include "embUnit.h"
diff --git a/tests/unittests/tests-bluetil/tests-bluetil.h b/tests/unittests/tests-bluetil/tests-bluetil.h
index 0215036d4ff9..72418d6a7ef1 100644
--- a/tests/unittests/tests-bluetil/tests-bluetil.h
+++ b/tests/unittests/tests-bluetil/tests-bluetil.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-aug.c b/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-aug.c
index e6b38647f52b..610fde482cee 100644
--- a/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-aug.c
+++ b/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-aug.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-false.c b/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-false.c
index 598e39d9aef1..8c5c47499fc9 100644
--- a/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-false.c
+++ b/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-false.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2022 Bennet Hattesen <bennet.blischke@haw-hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Bennet Hattesen <bennet.blischke@haw-hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-fcs.c b/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-fcs.c
index b71f9ff2b694..ac0d032eddc7 100644
--- a/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-fcs.c
+++ b/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-fcs.c
@@ -1,10 +1,8 @@
 /*
- * Copyright 2025 Bennet Hattesen <bennet.blischke@haw-hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Bennet Hattesen <bennet.blischke@haw-hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
+
 #include <stdint.h>
 
 #include "embUnit/embUnit.h"
diff --git a/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-kermit.c b/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-kermit.c
index 42173da7bfd6..7b06b210f70d 100644
--- a/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-kermit.c
+++ b/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-kermit.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2022 Bennet Hattesen <bennet.blischke@haw-hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Bennet Hattesen <bennet.blischke@haw-hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-mcrf4xx.c b/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-mcrf4xx.c
index 26e07cd1ac12..c8cb65e8806f 100644
--- a/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-mcrf4xx.c
+++ b/tests/unittests/tests-checksum/tests-checksum-crc16-ccitt-mcrf4xx.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2022 Bennet Hattesen <bennet.blischke@haw-hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Bennet Hattesen <bennet.blischke@haw-hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-checksum/tests-checksum-crc32.c b/tests/unittests/tests-checksum/tests-checksum-crc32.c
index 49b2ed8c7cca..23305c26830b 100644
--- a/tests/unittests/tests-checksum/tests-checksum-crc32.c
+++ b/tests/unittests/tests-checksum/tests-checksum-crc32.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2022 Benjamin Valentin <benpicco@googlemail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Benjamin Valentin <benpicco@googlemail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include "checksum/crc32.h"
diff --git a/tests/unittests/tests-checksum/tests-checksum-crc8-lsb.c b/tests/unittests/tests-checksum/tests-checksum-crc8-lsb.c
index fe50af4ef5f7..0cfcaaf32814 100644
--- a/tests/unittests/tests-checksum/tests-checksum-crc8-lsb.c
+++ b/tests/unittests/tests-checksum/tests-checksum-crc8-lsb.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2019 Benjamin Valentin <benpicco@googlemail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Benjamin Valentin <benpicco@googlemail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-checksum/tests-checksum-crc8.c b/tests/unittests/tests-checksum/tests-checksum-crc8.c
index 85c930412303..b63c6d9f27f5 100644
--- a/tests/unittests/tests-checksum/tests-checksum-crc8.c
+++ b/tests/unittests/tests-checksum/tests-checksum-crc8.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2019 Benjamin Valentin <benpicco@googlemail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Benjamin Valentin <benpicco@googlemail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-checksum/tests-checksum-fletcher16.c b/tests/unittests/tests-checksum/tests-checksum-fletcher16.c
index 935e8559d610..a48991c808d9 100644
--- a/tests/unittests/tests-checksum/tests-checksum-fletcher16.c
+++ b/tests/unittests/tests-checksum/tests-checksum-fletcher16.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-checksum/tests-checksum-fletcher32.c b/tests/unittests/tests-checksum/tests-checksum-fletcher32.c
index cd3ed5cd3a1d..262da13c0408 100644
--- a/tests/unittests/tests-checksum/tests-checksum-fletcher32.c
+++ b/tests/unittests/tests-checksum/tests-checksum-fletcher32.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <assert.h>
diff --git a/tests/unittests/tests-checksum/tests-checksum-ucrc16.c b/tests/unittests/tests-checksum/tests-checksum-ucrc16.c
index b363df2f6fc7..da1d8dcf6c96 100644
--- a/tests/unittests/tests-checksum/tests-checksum-ucrc16.c
+++ b/tests/unittests/tests-checksum/tests-checksum-ucrc16.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-checksum/tests-checksum.c b/tests/unittests/tests-checksum/tests-checksum.c
index 6e9562370ba4..9d4acdc45a32 100644
--- a/tests/unittests/tests-checksum/tests-checksum.c
+++ b/tests/unittests/tests-checksum/tests-checksum.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include "tests-checksum.h"
diff --git a/tests/unittests/tests-checksum/tests-checksum.h b/tests/unittests/tests-checksum/tests-checksum.h
index b0def3f9e678..9b2e9a4e2a5e 100644
--- a/tests/unittests/tests-checksum/tests-checksum.h
+++ b/tests/unittests/tests-checksum/tests-checksum.h
@@ -1,9 +1,6 @@
 /*
- * Copyright 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-chunked_ringbuffer/tests-chunked_ringbuffer.c b/tests/unittests/tests-chunked_ringbuffer/tests-chunked_ringbuffer.c
index 238bbd44313e..ce1820087fe8 100644
--- a/tests/unittests/tests-chunked_ringbuffer/tests-chunked_ringbuffer.c
+++ b/tests/unittests/tests-chunked_ringbuffer/tests-chunked_ringbuffer.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-clif/tests-clif.c b/tests/unittests/tests-clif/tests-clif.c
index 861aa0c7cdd5..20c87db72e99 100644
--- a/tests/unittests/tests-clif/tests-clif.c
+++ b/tests/unittests/tests-clif/tests-clif.c
@@ -1,10 +1,7 @@
 /*
-* Copyright (C) 2019 HAW Hamburg
-*
-* This file is subject to the terms and conditions of the GNU Lesser
-* General Public License v2.1. See the file LICENSE in the top level
-* directory for more details.
-*/
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
 
 #include <string.h>
 #include "embUnit.h"
diff --git a/tests/unittests/tests-clif/tests-clif.h b/tests/unittests/tests-clif/tests-clif.h
index b9f4dc0c6b41..a7fadd9b69d5 100644
--- a/tests/unittests/tests-clif/tests-clif.h
+++ b/tests/unittests/tests-clif/tests-clif.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-coding/tests-coding-xor.c b/tests/unittests/tests-coding/tests-coding-xor.c
index c56ec80adda2..03acea6d4ad2 100644
--- a/tests/unittests/tests-coding/tests-coding-xor.c
+++ b/tests/unittests/tests-coding/tests-coding-xor.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Benjamin Valentin <benjamin.valentin@ml-pa.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-coding/tests-coding.c b/tests/unittests/tests-coding/tests-coding.c
index 228887f4d029..61cf340e12ad 100644
--- a/tests/unittests/tests-coding/tests-coding.c
+++ b/tests/unittests/tests-coding/tests-coding.c
@@ -1,9 +1,6 @@
 /*
- * Copyright 2021 Benjamin Valentin <benjamin.valentin@ml-pa.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include "tests-coding.h"
diff --git a/tests/unittests/tests-coding/tests-coding.h b/tests/unittests/tests-coding/tests-coding.h
index 6598e196040b..773b3b05f007 100644
--- a/tests/unittests/tests-coding/tests-coding.h
+++ b/tests/unittests/tests-coding/tests-coding.h
@@ -1,9 +1,6 @@
 /*
- * Copyright 2021 Benjamin Valentin <benjamin.valentin@ml-pa.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-color/tests-color.c b/tests/unittests/tests-color/tests-color.c
index eaa4f0466330..308cb7b15a83 100644
--- a/tests/unittests/tests-color/tests-color.c
+++ b/tests/unittests/tests-color/tests-color.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Cenk Gündoğan <mail@cgundogan.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Cenk Gündoğan <mail@cgundogan.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-color/tests-color.h b/tests/unittests/tests-color/tests-color.h
index abb565e1c435..f718ea359ee4 100644
--- a/tests/unittests/tests-color/tests-color.h
+++ b/tests/unittests/tests-color/tests-color.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Cenk Gündoğan <mail@cgundogan.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Cenk Gündoğan <mail@cgundogan.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-core/tests-core-atomic.c b/tests/unittests/tests-core/tests-core-atomic.c
index 7089f9edfae8..594c89d1a4d5 100644
--- a/tests/unittests/tests-core/tests-core-atomic.c
+++ b/tests/unittests/tests-core/tests-core-atomic.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- * Copyright (C) 2015 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-FileCopyrightText: 2015 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <limits.h>
diff --git a/tests/unittests/tests-core/tests-core-bitarithm.c b/tests/unittests/tests-core/tests-core-bitarithm.c
index 56d2cf77de42..f9404b615ccd 100644
--- a/tests/unittests/tests-core/tests-core-bitarithm.c
+++ b/tests/unittests/tests-core/tests-core-bitarithm.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <limits.h>
diff --git a/tests/unittests/tests-core/tests-core-byteorder.c b/tests/unittests/tests-core/tests-core-byteorder.c
index 5ffe7cd445d2..77804de4e328 100644
--- a/tests/unittests/tests-core/tests-core-byteorder.c
+++ b/tests/unittests/tests-core/tests-core-byteorder.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 René Kijewski
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 René Kijewski
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <string.h>
diff --git a/tests/unittests/tests-core/tests-core-cib.c b/tests/unittests/tests-core/tests-core-cib.c
index 7c5d70ddbfe9..c9c25699865d 100644
--- a/tests/unittests/tests-core/tests-core-cib.c
+++ b/tests/unittests/tests-core/tests-core-cib.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <limits.h>
diff --git a/tests/unittests/tests-core/tests-core-clist.c b/tests/unittests/tests-core/tests-core-clist.c
index fce569e0f0ea..b7a0d7c0adc6 100644
--- a/tests/unittests/tests-core/tests-core-clist.c
+++ b/tests/unittests/tests-core/tests-core-clist.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <assert.h>
diff --git a/tests/unittests/tests-core/tests-core-list.c b/tests/unittests/tests-core/tests-core-list.c
index 785eb7959ca1..49be5c7cf2ec 100644
--- a/tests/unittests/tests-core/tests-core-list.c
+++ b/tests/unittests/tests-core/tests-core-list.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <string.h>
diff --git a/tests/unittests/tests-core/tests-core-macros.c b/tests/unittests/tests-core/tests-core-macros.c
index bd77d0e87c15..4c6451c391da 100644
--- a/tests/unittests/tests-core/tests-core-macros.c
+++ b/tests/unittests/tests-core/tests-core-macros.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stddef.h>
diff --git a/tests/unittests/tests-core/tests-core-mbox.c b/tests/unittests/tests-core/tests-core-mbox.c
index e03c3244b146..09bb25602ed1 100644
--- a/tests/unittests/tests-core/tests-core-mbox.c
+++ b/tests/unittests/tests-core/tests-core-mbox.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <limits.h>
diff --git a/tests/unittests/tests-core/tests-core-priority-queue.c b/tests/unittests/tests-core/tests-core-priority-queue.c
index 481a67f3ee10..849f25cdcf0a 100644
--- a/tests/unittests/tests-core/tests-core-priority-queue.c
+++ b/tests/unittests/tests-core/tests-core-priority-queue.c
@@ -1,10 +1,8 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
+
 #include <string.h>
 
 #include "container.h"
diff --git a/tests/unittests/tests-core/tests-core-ringbuffer.c b/tests/unittests/tests-core/tests-core-ringbuffer.c
index 38d7d93475dc..e481b3d82213 100644
--- a/tests/unittests/tests-core/tests-core-ringbuffer.c
+++ b/tests/unittests/tests-core/tests-core-ringbuffer.c
@@ -1,19 +1,6 @@
 /*
- * Copyright (C) 2014  René Kijewski  <rene.kijewski@fu-berlin.de>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * SPDX-FileCopyrightText: 2014 René Kijewski <rene.kijewski@fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include "thread.h"
diff --git a/tests/unittests/tests-core/tests-core-xfa-data1.c b/tests/unittests/tests-core/tests-core-xfa-data1.c
index d5eeafcca2f1..e37fb3f244a8 100644
--- a/tests/unittests/tests-core/tests-core-xfa-data1.c
+++ b/tests/unittests/tests-core/tests-core-xfa-data1.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-core/tests-core-xfa-data2.c b/tests/unittests/tests-core/tests-core-xfa-data2.c
index 9d6efcedaf14..1a1889ac7303 100644
--- a/tests/unittests/tests-core/tests-core-xfa-data2.c
+++ b/tests/unittests/tests-core/tests-core-xfa-data2.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-core/tests-core-xfa.c b/tests/unittests/tests-core/tests-core-xfa.c
index 1b0deb4d7b5a..f0cc944c6a23 100644
--- a/tests/unittests/tests-core/tests-core-xfa.c
+++ b/tests/unittests/tests-core/tests-core-xfa.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-core/tests-core-xfa.h b/tests/unittests/tests-core/tests-core-xfa.h
index 8cd53ab3860a..bbc3ad0402a7 100644
--- a/tests/unittests/tests-core/tests-core-xfa.h
+++ b/tests/unittests/tests-core/tests-core-xfa.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-core/tests-core.c b/tests/unittests/tests-core/tests-core.c
index 6e58a738d635..ec28178136cc 100644
--- a/tests/unittests/tests-core/tests-core.c
+++ b/tests/unittests/tests-core/tests-core.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include "tests-core.h"
diff --git a/tests/unittests/tests-core/tests-core.h b/tests/unittests/tests-core/tests-core.h
index c307b0d73638..207c47bce090 100644
--- a/tests/unittests/tests-core/tests-core.h
+++ b/tests/unittests/tests-core/tests-core.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-credman/credentials.h b/tests/unittests/tests-credman/credentials.h
index 8db0c376accc..d52fd8f2e1c5 100644
--- a/tests/unittests/tests-credman/credentials.h
+++ b/tests/unittests/tests-credman/credentials.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-credman/tests-credman.c b/tests/unittests/tests-credman/tests-credman.c
index 6ec842074731..553c2c2e1f90 100644
--- a/tests/unittests/tests-credman/tests-credman.c
+++ b/tests/unittests/tests-credman/tests-credman.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <string.h>
diff --git a/tests/unittests/tests-credman/tests-credman.h b/tests/unittests/tests-credman/tests-credman.h
index adab36830dc1..ffe28fb260eb 100644
--- a/tests/unittests/tests-credman/tests-credman.h
+++ b/tests/unittests/tests-credman/tests-credman.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-div/tests-div.c b/tests/unittests/tests-div/tests-div.c
index 30e4e908ed01..726b35c63ecb 100644
--- a/tests/unittests/tests-div/tests-div.c
+++ b/tests/unittests/tests-div/tests-div.c
@@ -1,10 +1,7 @@
 /*
-* Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
-*
-* This file is subject to the terms and conditions of the GNU Lesser
-* General Public License v2.1. See the file LICENSE in the top level
-* directory for more details.
-*/
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
 
 #include <string.h>
 #include <inttypes.h>
diff --git a/tests/unittests/tests-div/tests-div.h b/tests/unittests/tests-div/tests-div.h
index 6e5fd8074e49..f97482ee6e7c 100644
--- a/tests/unittests/tests-div/tests-div.h
+++ b/tests/unittests/tests-div/tests-div.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-dns_cache/tests-dns_cache.c b/tests/unittests/tests-dns_cache/tests-dns_cache.c
index a9cb3267085f..0aad8cea3733 100644
--- a/tests/unittests/tests-dns_cache/tests-dns_cache.c
+++ b/tests/unittests/tests-dns_cache/tests-dns_cache.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-dns_cache/tests-dns_cache.h b/tests/unittests/tests-dns_cache/tests-dns_cache.h
index f4aec729da9a..65405508c9b4 100644
--- a/tests/unittests/tests-dns_cache/tests-dns_cache.h
+++ b/tests/unittests/tests-dns_cache/tests-dns_cache.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-dns_msg/tests-dns_msg.c b/tests/unittests/tests-dns_msg/tests-dns_msg.c
index 2e5616c2901c..218ac1016d8d 100644
--- a/tests/unittests/tests-dns_msg/tests-dns_msg.c
+++ b/tests/unittests/tests-dns_msg/tests-dns_msg.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2024 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-dns_msg/tests-dns_msg.h b/tests/unittests/tests-dns_msg/tests-dns_msg.h
index af1ab8cc700f..e886bbd79dcd 100644
--- a/tests/unittests/tests-dns_msg/tests-dns_msg.h
+++ b/tests/unittests/tests-dns_msg/tests-dns_msg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2024 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-ecc/tests-ecc.c b/tests/unittests/tests-ecc/tests-ecc.c
index 21225a76631e..6bf5024d3cc0 100644
--- a/tests/unittests/tests-ecc/tests-ecc.c
+++ b/tests/unittests/tests-ecc/tests-ecc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Lucas Jenß
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Lucas Jenß
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-fib/tests-fib.c b/tests/unittests/tests-fib/tests-fib.c
index 508a207eb3be..7e7b894b31ce 100644
--- a/tests/unittests/tests-fib/tests-fib.c
+++ b/tests/unittests/tests-fib/tests-fib.c
@@ -1,10 +1,7 @@
 /*
-* Copyright (C) 2015 Martin Landsmann
-*
-* This file is subject to the terms and conditions of the GNU Lesser
-* General Public License v2.1. See the file LICENSE in the top level
-* directory for more details.
-*/
+ * SPDX-FileCopyrightText: 2015 Martin Landsmann
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
 
 #define TEST_FIB_SHOW_OUTPUT (0) /**< set  */
 
diff --git a/tests/unittests/tests-fib/tests-fib.h b/tests/unittests/tests-fib/tests-fib.h
index d80a6145f628..72963ece114b 100644
--- a/tests/unittests/tests-fib/tests-fib.h
+++ b/tests/unittests/tests-fib/tests-fib.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martin Landsmann
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martin Landsmann
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-fib_sr/tests-fib_sr.c b/tests/unittests/tests-fib_sr/tests-fib_sr.c
index 2af5243175f3..84ecc623fd78 100644
--- a/tests/unittests/tests-fib_sr/tests-fib_sr.c
+++ b/tests/unittests/tests-fib_sr/tests-fib_sr.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martin Landsmann
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martin Landsmann
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdio.h> /**< required for snprintf() */
diff --git a/tests/unittests/tests-fib_sr/tests-fib_sr.h b/tests/unittests/tests-fib_sr/tests-fib_sr.h
index 1c92ceecfd5f..d94ff9220bcb 100644
--- a/tests/unittests/tests-fib_sr/tests-fib_sr.h
+++ b/tests/unittests/tests-fib_sr/tests-fib_sr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martin Landsmann
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martin Landsmann
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-fmt/tests-fmt.c b/tests/unittests/tests-fmt/tests-fmt.c
index dec1186bed7c..460359a8e0a2 100644
--- a/tests/unittests/tests-fmt/tests-fmt.c
+++ b/tests/unittests/tests-fmt/tests-fmt.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-fmt/tests-fmt.h b/tests/unittests/tests-fmt/tests-fmt.h
index c0ea5a3ead7e..4a2cbc09376d 100644
--- a/tests/unittests/tests-fmt/tests-fmt.h
+++ b/tests/unittests/tests-fmt/tests-fmt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-frac/tests-frac.c b/tests/unittests/tests-frac/tests-frac.c
index df362b17267a..d348135a0667 100644
--- a/tests/unittests/tests-frac/tests-frac.c
+++ b/tests/unittests/tests-frac/tests-frac.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <inttypes.h>
diff --git a/tests/unittests/tests-frac/tests-frac.h b/tests/unittests/tests-frac/tests-frac.h
index 434f2c1035a2..ec50fc1fa3cd 100644
--- a/tests/unittests/tests-frac/tests-frac.h
+++ b/tests/unittests/tests-frac/tests-frac.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-gcoap/tests-gcoap.c b/tests/unittests/tests-gcoap/tests-gcoap.c
index a043847ae6d7..dec724cd3279 100644
--- a/tests/unittests/tests-gcoap/tests-gcoap.c
+++ b/tests/unittests/tests-gcoap/tests-gcoap.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (c) 2016 Ken Bannister. All rights reserved.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Ken Bannister
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gcoap/tests-gcoap.h b/tests/unittests/tests-gcoap/tests-gcoap.h
index 2fd47162aff4..04a0276cb4ad 100644
--- a/tests/unittests/tests-gcoap/tests-gcoap.h
+++ b/tests/unittests/tests-gcoap/tests-gcoap.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (c) 2016 Ken Bannister. All rights reserved.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Ken Bannister
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-gnrc_ipv6/tests-gnrc_ipv6.c b/tests/unittests/tests-gnrc_ipv6/tests-gnrc_ipv6.c
index 014eee08fb45..5b63e1e36cb8 100644
--- a/tests/unittests/tests-gnrc_ipv6/tests-gnrc_ipv6.c
+++ b/tests/unittests/tests-gnrc_ipv6/tests-gnrc_ipv6.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 INRIA
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 INRIA
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_ipv6/tests-gnrc_ipv6.h b/tests/unittests/tests-gnrc_ipv6/tests-gnrc_ipv6.h
index 0bea1ae0a7f9..8d40aeb44a58 100644
--- a/tests/unittests/tests-gnrc_ipv6/tests-gnrc_ipv6.h
+++ b/tests/unittests/tests-gnrc_ipv6/tests-gnrc_ipv6.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 INRIA
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 INRIA
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.c b/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.c
index 5440ac1925d3..91e554c4a1c3 100644
--- a/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.c
+++ b/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.h b/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.h
index be61908349bd..088037458ca5 100644
--- a/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.h
+++ b/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martin Lenders
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martin Lenders
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-abr.c b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-abr.c
index 8d3e6dc0fee1..3e0520536eca 100644
--- a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-abr.c
+++ b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-abr.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-ft.c b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-ft.c
index 5fa2b35f08a0..415996ac3ffc 100644
--- a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-ft.c
+++ b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-ft.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-internal.c b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-internal.c
index 8f0f85643360..a049a346d0c7 100644
--- a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-internal.c
+++ b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-internal.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-nc.c b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-nc.c
index b7c769ee7957..09eae10bd078 100644
--- a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-nc.c
+++ b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-nc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-pl.c b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-pl.c
index 9cd8528033ab..171a306c32d5 100644
--- a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-pl.c
+++ b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib-pl.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib.c b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib.c
index 8ea9147cd7b7..cf83adcfd56c 100644
--- a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib.c
+++ b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib.h b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib.h
index b1adf3a10cf6..59efea334292 100644
--- a/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib.h
+++ b/tests/unittests/tests-gnrc_ipv6_nib/tests-gnrc_ipv6_nib.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-gnrc_netif_pktq/tests-gnrc_netif_pktq.c b/tests/unittests/tests-gnrc_netif_pktq/tests-gnrc_netif_pktq.c
index ceaf9bb48a4b..454cd2b6f543 100644
--- a/tests/unittests/tests-gnrc_netif_pktq/tests-gnrc_netif_pktq.c
+++ b/tests/unittests/tests-gnrc_netif_pktq/tests-gnrc_netif_pktq.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_netif_pktq/tests-gnrc_netif_pktq.h b/tests/unittests/tests-gnrc_netif_pktq/tests-gnrc_netif_pktq.h
index 6b529fe75b3a..5d89c55a7e2d 100644
--- a/tests/unittests/tests-gnrc_netif_pktq/tests-gnrc_netif_pktq.h
+++ b/tests/unittests/tests-gnrc_netif_pktq/tests-gnrc_netif_pktq.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-gnrc_sixlowpan_frag_vrb/tests-gnrc_sixlowpan_frag_vrb.c b/tests/unittests/tests-gnrc_sixlowpan_frag_vrb/tests-gnrc_sixlowpan_frag_vrb.c
index 4e3fac78770f..48d681a10335 100644
--- a/tests/unittests/tests-gnrc_sixlowpan_frag_vrb/tests-gnrc_sixlowpan_frag_vrb.c
+++ b/tests/unittests/tests-gnrc_sixlowpan_frag_vrb/tests-gnrc_sixlowpan_frag_vrb.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_sixlowpan_frag_vrb/tests-gnrc_sixlowpan_frag_vrb.h b/tests/unittests/tests-gnrc_sixlowpan_frag_vrb/tests-gnrc_sixlowpan_frag_vrb.h
index ce656cc1ce38..d337265df329 100644
--- a/tests/unittests/tests-gnrc_sixlowpan_frag_vrb/tests-gnrc_sixlowpan_frag_vrb.h
+++ b/tests/unittests/tests-gnrc_sixlowpan_frag_vrb/tests-gnrc_sixlowpan_frag_vrb.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-gnrc_udp/tests-gnrc_udp.c b/tests/unittests/tests-gnrc_udp/tests-gnrc_udp.c
index 39a0a05274b9..8ede478b811d 100644
--- a/tests/unittests/tests-gnrc_udp/tests-gnrc_udp.c
+++ b/tests/unittests/tests-gnrc_udp/tests-gnrc_udp.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Takuo Yonezawa <Yonezawa-T2@mail.dnp.co.jp>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Takuo Yonezawa <Yonezawa-T2@mail.dnp.co.jp>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_udp/tests-gnrc_udp.h b/tests/unittests/tests-gnrc_udp/tests-gnrc_udp.h
index d97f3a544d96..3e3c1ee650d1 100644
--- a/tests/unittests/tests-gnrc_udp/tests-gnrc_udp.h
+++ b/tests/unittests/tests-gnrc_udp/tests-gnrc_udp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Takuo Yonezawa
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Takuo Yonezawa
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-hashes/tests-hashes-aes128_cmac.c b/tests/unittests/tests-hashes/tests-hashes-aes128_cmac.c
index 01b9a5adddd6..1def0081b9fd 100644
--- a/tests/unittests/tests-hashes/tests-hashes-aes128_cmac.c
+++ b/tests/unittests/tests-hashes/tests-hashes-aes128_cmac.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Fundación Inria Chile
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Fundación Inria Chile
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-hashes/tests-hashes-md5.c b/tests/unittests/tests-hashes/tests-hashes-md5.c
index 8d16d7824809..02e8dd8b5d5c 100644
--- a/tests/unittests/tests-hashes/tests-hashes-md5.c
+++ b/tests/unittests/tests-hashes/tests-hashes-md5.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-hashes/tests-hashes-sha1.c b/tests/unittests/tests-hashes/tests-hashes-sha1.c
index b7c65ed77bb8..58a135b470cd 100644
--- a/tests/unittests/tests-hashes/tests-hashes-sha1.c
+++ b/tests/unittests/tests-hashes/tests-hashes-sha1.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Oliver Hahm <oliver.hahm@inria.fr>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Oliver Hahm <oliver.hahm@inria.fr>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-hashes/tests-hashes-sha224.c b/tests/unittests/tests-hashes/tests-hashes-sha224.c
index 7a87973b48c8..965e01b810e5 100644
--- a/tests/unittests/tests-hashes/tests-hashes-sha224.c
+++ b/tests/unittests/tests-hashes/tests-hashes-sha224.c
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
- /**
+/**
  * @ingroup     unittests
  * @{
  *
diff --git a/tests/unittests/tests-hashes/tests-hashes-sha256-chain.c b/tests/unittests/tests-hashes/tests-hashes-sha256-chain.c
index c20cfa7debf8..141ca96a9ce6 100644
--- a/tests/unittests/tests-hashes/tests-hashes-sha256-chain.c
+++ b/tests/unittests/tests-hashes/tests-hashes-sha256-chain.c
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
- /**
+/**
  * @ingroup     unittests
  * @{
  *
diff --git a/tests/unittests/tests-hashes/tests-hashes-sha256-hmac.c b/tests/unittests/tests-hashes/tests-hashes-sha256-hmac.c
index a35809e78f1f..40bd9a802774 100644
--- a/tests/unittests/tests-hashes/tests-hashes-sha256-hmac.c
+++ b/tests/unittests/tests-hashes/tests-hashes-sha256-hmac.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
- * Copyright 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <limits.h>
diff --git a/tests/unittests/tests-hashes/tests-hashes-sha256.c b/tests/unittests/tests-hashes/tests-hashes-sha256.c
index 1b8ec53dbda3..757e45389082 100644
--- a/tests/unittests/tests-hashes/tests-hashes-sha256.c
+++ b/tests/unittests/tests-hashes/tests-hashes-sha256.c
@@ -1,14 +1,11 @@
 /*
- * Copyright (C) 2013 Christian Mehlis <mehlis@inf.fu-berlin.de>
- * Copyright (C) 2014 Philipp Rosenkranz <philipp.rosenkranz@fu-berlin.de>
- * Copyright (C) 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2013 Christian Mehlis <mehlis@inf.fu-berlin.de>
+ * SPDX-FileCopyrightText: 2014 Philipp Rosenkranz <philipp.rosenkranz@fu-berlin.de>
+ * SPDX-FileCopyrightText: 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
- /**
+/**
  * @ingroup     unittests
  * @{
  *
diff --git a/tests/unittests/tests-hashes/tests-hashes-sha3.c b/tests/unittests/tests-hashes/tests-hashes-sha3.c
index 1c27ac293452..348fcee17951 100644
--- a/tests/unittests/tests-hashes/tests-hashes-sha3.c
+++ b/tests/unittests/tests-hashes/tests-hashes-sha3.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017-2018 Mathias Tausig <mathias.tausig@fh-campsuwien.ac.at>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017-2018 Mathias Tausig <mathias.tausig@fh-campsuwien.ac.at>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-hashes/tests-hashes-sha384.c b/tests/unittests/tests-hashes/tests-hashes-sha384.c
index d9229854dcc2..68acc63d6ee0 100644
--- a/tests/unittests/tests-hashes/tests-hashes-sha384.c
+++ b/tests/unittests/tests-hashes/tests-hashes-sha384.c
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2023 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
- /**
+/**
  * @ingroup     unittests
  * @{
  *
diff --git a/tests/unittests/tests-hashes/tests-hashes-sha512.c b/tests/unittests/tests-hashes/tests-hashes-sha512.c
index eb7aed1a0e1d..49047bbde561 100644
--- a/tests/unittests/tests-hashes/tests-hashes-sha512.c
+++ b/tests/unittests/tests-hashes/tests-hashes-sha512.c
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2023 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
- /**
+/**
  * @ingroup     unittests
  * @{
  *
diff --git a/tests/unittests/tests-hashes/tests-hashes-sha512_224.c b/tests/unittests/tests-hashes/tests-hashes-sha512_224.c
index 806de647ca5a..43ed2ff3d1bb 100644
--- a/tests/unittests/tests-hashes/tests-hashes-sha512_224.c
+++ b/tests/unittests/tests-hashes/tests-hashes-sha512_224.c
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2023 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
- /**
+/**
  * @ingroup     unittests
  * @{
  *
diff --git a/tests/unittests/tests-hashes/tests-hashes-sha512_256.c b/tests/unittests/tests-hashes/tests-hashes-sha512_256.c
index 8b254e4f6c0f..7edec8ed5168 100644
--- a/tests/unittests/tests-hashes/tests-hashes-sha512_256.c
+++ b/tests/unittests/tests-hashes/tests-hashes-sha512_256.c
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2023 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
- /**
+/**
  * @ingroup     unittests
  * @{
  *
diff --git a/tests/unittests/tests-hashes/tests-hashes.c b/tests/unittests/tests-hashes/tests-hashes.c
index 05166de7b0ae..0025fd2be87d 100644
--- a/tests/unittests/tests-hashes/tests-hashes.c
+++ b/tests/unittests/tests-hashes/tests-hashes.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-hashes/tests-hashes.h b/tests/unittests/tests-hashes/tests-hashes.h
index c12d93a283f9..25627e784554 100644
--- a/tests/unittests/tests-hashes/tests-hashes.h
+++ b/tests/unittests/tests-hashes/tests-hashes.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-ieee802154/tests-ieee802154.c b/tests/unittests/tests-ieee802154/tests-ieee802154.c
index e7a48757cfbd..cad6314818ea 100644
--- a/tests/unittests/tests-ieee802154/tests-ieee802154.c
+++ b/tests/unittests/tests-ieee802154/tests-ieee802154.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ieee802154/tests-ieee802154.h b/tests/unittests/tests-ieee802154/tests-ieee802154.h
index e8b1dc27a08d..ffd367eeec37 100644
--- a/tests/unittests/tests-ieee802154/tests-ieee802154.h
+++ b/tests/unittests/tests-ieee802154/tests-ieee802154.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-inet_csum/tests-inet_csum.c b/tests/unittests/tests-inet_csum/tests-inet_csum.c
index b47e76676596..445d7e810b07 100644
--- a/tests/unittests/tests-inet_csum/tests-inet_csum.c
+++ b/tests/unittests/tests-inet_csum/tests-inet_csum.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-inet_csum/tests-inet_csum.h b/tests/unittests/tests-inet_csum/tests-inet_csum.h
index 645139b3d002..c7aa007f920e 100644
--- a/tests/unittests/tests-inet_csum/tests-inet_csum.h
+++ b/tests/unittests/tests-inet_csum/tests-inet_csum.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martin Lenders
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martin Lenders
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-ipv4_addr/tests-ipv4_addr.c b/tests/unittests/tests-ipv4_addr/tests-ipv4_addr.c
index 1fa153804590..12719d674a22 100644
--- a/tests/unittests/tests-ipv4_addr/tests-ipv4_addr.c
+++ b/tests/unittests/tests-ipv4_addr/tests-ipv4_addr.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ipv4_addr/tests-ipv4_addr.h b/tests/unittests/tests-ipv4_addr/tests-ipv4_addr.h
index 84071cdfe470..61229b0aaed5 100644
--- a/tests/unittests/tests-ipv4_addr/tests-ipv4_addr.h
+++ b/tests/unittests/tests-ipv4_addr/tests-ipv4_addr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-ipv6_addr/tests-ipv6_addr.c b/tests/unittests/tests-ipv6_addr/tests-ipv6_addr.c
index 8a3197d2e725..fb08d763c0f8 100644
--- a/tests/unittests/tests-ipv6_addr/tests-ipv6_addr.c
+++ b/tests/unittests/tests-ipv6_addr/tests-ipv6_addr.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ipv6_addr/tests-ipv6_addr.h b/tests/unittests/tests-ipv6_addr/tests-ipv6_addr.h
index 3d5dd9c87342..cfc247101aa5 100644
--- a/tests/unittests/tests-ipv6_addr/tests-ipv6_addr.h
+++ b/tests/unittests/tests-ipv6_addr/tests-ipv6_addr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.c b/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.c
index 48a81dd8af6d..4181603cb966 100644
--- a/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.c
+++ b/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *               2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.h b/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.h
index 542c7b716a05..1d1e7e950a4a 100644
--- a/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.h
+++ b/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martin Lenders
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martin Lenders
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-isrpipe/tests-isrpipe-read_timeout.c b/tests/unittests/tests-isrpipe/tests-isrpipe-read_timeout.c
index 8acbde90bf40..71f9fbc2cfe5 100644
--- a/tests/unittests/tests-isrpipe/tests-isrpipe-read_timeout.c
+++ b/tests/unittests/tests-isrpipe/tests-isrpipe-read_timeout.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (c) 2025 Prime Controls, Inc.(R)
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Prime Controls, Inc.(R)
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <errno.h>
diff --git a/tests/unittests/tests-isrpipe/tests-isrpipe.c b/tests/unittests/tests-isrpipe/tests-isrpipe.c
index 29607275d448..565512466874 100644
--- a/tests/unittests/tests-isrpipe/tests-isrpipe.c
+++ b/tests/unittests/tests-isrpipe/tests-isrpipe.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (c) 2025 Prime Controls, Inc.(R)
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Prime Controls, Inc.(R)
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <string.h>
diff --git a/tests/unittests/tests-isrpipe/tests-isrpipe.h b/tests/unittests/tests-isrpipe/tests-isrpipe.h
index 7f996f92ff79..7b62820ad4fb 100644
--- a/tests/unittests/tests-isrpipe/tests-isrpipe.h
+++ b/tests/unittests/tests-isrpipe/tests-isrpipe.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (c) 2025 Prime Controls, Inc.(R)
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Prime Controls, Inc.(R)
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-kernel_defines/tests-kernel_defines.c b/tests/unittests/tests-kernel_defines/tests-kernel_defines.c
index b65e2a443399..ff83a130e214 100644
--- a/tests/unittests/tests-kernel_defines/tests-kernel_defines.c
+++ b/tests/unittests/tests-kernel_defines/tests-kernel_defines.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-kernel_defines/tests-kernel_defines.h b/tests/unittests/tests-kernel_defines/tests-kernel_defines.h
index 35fdcd13ede7..a7f21b6871da 100644
--- a/tests/unittests/tests-kernel_defines/tests-kernel_defines.h
+++ b/tests/unittests/tests-kernel_defines/tests-kernel_defines.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-libc/tests-libc.c b/tests/unittests/tests-libc/tests-libc.c
index d88351c08201..73e20aba6495 100644
--- a/tests/unittests/tests-libc/tests-libc.c
+++ b/tests/unittests/tests-libc/tests-libc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-libc/tests-libc.h b/tests/unittests/tests-libc/tests-libc.h
index b7df18bf1515..052a7ea028f7 100644
--- a/tests/unittests/tests-libc/tests-libc.h
+++ b/tests/unittests/tests-libc/tests-libc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-luid/tests-luid.c b/tests/unittests/tests-luid/tests-luid.c
index 08af1de74ba0..7075f8506020 100644
--- a/tests/unittests/tests-luid/tests-luid.c
+++ b/tests/unittests/tests-luid/tests-luid.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdint.h>
diff --git a/tests/unittests/tests-luid/tests-luid.h b/tests/unittests/tests-luid/tests-luid.h
index 36bc09c64681..101891126a6b 100644
--- a/tests/unittests/tests-luid/tests-luid.h
+++ b/tests/unittests/tests-luid/tests-luid.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-matstat/tests-matstat.c b/tests/unittests/tests-matstat/tests-matstat.c
index 626ca8ebaad9..9ccbc7be6452 100644
--- a/tests/unittests/tests-matstat/tests-matstat.c
+++ b/tests/unittests/tests-matstat/tests-matstat.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <string.h>
diff --git a/tests/unittests/tests-matstat/tests-matstat.h b/tests/unittests/tests-matstat/tests-matstat.h
index 67a7bcd4c6b7..25f272f570eb 100644
--- a/tests/unittests/tests-matstat/tests-matstat.h
+++ b/tests/unittests/tests-matstat/tests-matstat.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-mtd/tests-mtd.c b/tests/unittests/tests-mtd/tests-mtd.c
index 7b097b40cb91..361cce465cd2 100644
--- a/tests/unittests/tests-mtd/tests-mtd.c
+++ b/tests/unittests/tests-mtd/tests-mtd.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-mtd/tests-mtd.h b/tests/unittests/tests-mtd/tests-mtd.h
index 7a1f57dc0c38..a57b1cc2db54 100644
--- a/tests/unittests/tests-mtd/tests-mtd.h
+++ b/tests/unittests/tests-mtd/tests-mtd.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-nanocoap/tests-nanocoap.c b/tests/unittests/tests-nanocoap/tests-nanocoap.c
index d183a9738caa..4b102d8af993 100644
--- a/tests/unittests/tests-nanocoap/tests-nanocoap.c
+++ b/tests/unittests/tests-nanocoap/tests-nanocoap.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (c) 2018 Ken Bannister. All rights reserved.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Ken Bannister
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-nanocoap_cache/tests-nanocoap_cache.c b/tests/unittests/tests-nanocoap_cache/tests-nanocoap_cache.c
index a108c00ab9b8..0d0192b81d4c 100644
--- a/tests/unittests/tests-nanocoap_cache/tests-nanocoap_cache.c
+++ b/tests/unittests/tests-nanocoap_cache/tests-nanocoap_cache.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (c) 2020 Cenk Gündoğan
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Cenk Gündoğan
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-nanocoap_cache/tests-nanocoap_cache.h b/tests/unittests/tests-nanocoap_cache/tests-nanocoap_cache.h
index f9b8705cb2c3..b3f8aba73463 100644
--- a/tests/unittests/tests-nanocoap_cache/tests-nanocoap_cache.h
+++ b/tests/unittests/tests-nanocoap_cache/tests-nanocoap_cache.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (c) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-netopt/tests-netopt.c b/tests/unittests/tests-netopt/tests-netopt.c
index 526a965756a9..70309dd0bff9 100644
--- a/tests/unittests/tests-netopt/tests-netopt.c
+++ b/tests/unittests/tests-netopt/tests-netopt.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-netopt/tests-netopt.h b/tests/unittests/tests-netopt/tests-netopt.h
index 82271c9468b1..6e8d9fdce325 100644
--- a/tests/unittests/tests-netopt/tests-netopt.h
+++ b/tests/unittests/tests-netopt/tests-netopt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-netreg/tests-netreg.c b/tests/unittests/tests-netreg/tests-netreg.c
index 04b6cf27f6c2..0518ce0a5ba2 100644
--- a/tests/unittests/tests-netreg/tests-netreg.c
+++ b/tests/unittests/tests-netreg/tests-netreg.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-netreg/tests-netreg.h b/tests/unittests/tests-netreg/tests-netreg.h
index 117d485cc0af..f606a7fb4c83 100644
--- a/tests/unittests/tests-netreg/tests-netreg.h
+++ b/tests/unittests/tests-netreg/tests-netreg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martin Lenders
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martin Lenders
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-phydat/tests-phydat.c b/tests/unittests/tests-phydat/tests-phydat.c
index 0dfaec9bc5d3..9686b6a439e5 100644
--- a/tests/unittests/tests-phydat/tests-phydat.c
+++ b/tests/unittests/tests-phydat/tests-phydat.c
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *               2018 Otto-von-Guericke-Universität Magdeburg
- *               2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-FileCopyrightText: 2018 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-phydat/tests-phydat.h b/tests/unittests/tests-phydat/tests-phydat.h
index 819848131fbf..eb843a452aca 100644
--- a/tests/unittests/tests-phydat/tests-phydat.h
+++ b/tests/unittests/tests-phydat/tests-phydat.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2018 Eistec AB
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-pkt/tests-pkt.c b/tests/unittests/tests-pkt/tests-pkt.c
index ff7621841cf2..a4efd6470efe 100644
--- a/tests/unittests/tests-pkt/tests-pkt.c
+++ b/tests/unittests/tests-pkt/tests-pkt.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2014, 2015 Martine Lenders <mail@martine-lenders.eu>
- * *             2015       Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014-2015 Martine Lenders <mail@martine-lenders.eu>
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-pkt/tests-pkt.h b/tests/unittests/tests-pkt/tests-pkt.h
index 82a2fbc0b795..cb1a45cb64c1 100644
--- a/tests/unittests/tests-pkt/tests-pkt.h
+++ b/tests/unittests/tests-pkt/tests-pkt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-pktbuf/tests-pktbuf.c b/tests/unittests/tests-pktbuf/tests-pktbuf.c
index cb9b30479f1f..32c06d199af1 100644
--- a/tests/unittests/tests-pktbuf/tests-pktbuf.c
+++ b/tests/unittests/tests-pktbuf/tests-pktbuf.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mail@martine-lenders.eu>
- *               2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mail@martine-lenders.eu>
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-pktbuf/tests-pktbuf.h b/tests/unittests/tests-pktbuf/tests-pktbuf.h
index afaa87e21288..039b565499de 100644
--- a/tests/unittests/tests-pktbuf/tests-pktbuf.h
+++ b/tests/unittests/tests-pktbuf/tests-pktbuf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-pktqueue/tests-pktqueue.c b/tests/unittests/tests-pktqueue/tests-pktqueue.c
index 84795307c658..6af1dec89818 100644
--- a/tests/unittests/tests-pktqueue/tests-pktqueue.c
+++ b/tests/unittests/tests-pktqueue/tests-pktqueue.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014, 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014-2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-pktqueue/tests-pktqueue.h b/tests/unittests/tests-pktqueue/tests-pktqueue.h
index a94756cc25ed..aff8e0755638 100644
--- a/tests/unittests/tests-pktqueue/tests-pktqueue.h
+++ b/tests/unittests/tests-pktqueue/tests-pktqueue.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-printf_float/tests-printf_float.c b/tests/unittests/tests-printf_float/tests-printf_float.c
index 3c2ef1d44e96..f44f2577565d 100644
--- a/tests/unittests/tests-printf_float/tests-printf_float.c
+++ b/tests/unittests/tests-printf_float/tests-printf_float.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-printf_float/tests-printf_float.h b/tests/unittests/tests-printf_float/tests-printf_float.h
index 2b49daac4db6..2671db6a44e8 100644
--- a/tests/unittests/tests-printf_float/tests-printf_float.h
+++ b/tests/unittests/tests-printf_float/tests-printf_float.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-priority_pktqueue/tests-priority_pktqueue.c b/tests/unittests/tests-priority_pktqueue/tests-priority_pktqueue.c
index cc5b8ca7ba4d..4a1d81bdd4a4 100644
--- a/tests/unittests/tests-priority_pktqueue/tests-priority_pktqueue.c
+++ b/tests/unittests/tests-priority_pktqueue/tests-priority_pktqueue.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016, 2016 Shuguo Zhuo <shuguo.zhuo@inria.fr>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Shuguo Zhuo <shuguo.zhuo@inria.fr>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-priority_pktqueue/tests-priority_pktqueue.h b/tests/unittests/tests-priority_pktqueue/tests-priority_pktqueue.h
index 6af9fa9f0c7f..b3923e32b5dd 100644
--- a/tests/unittests/tests-priority_pktqueue/tests-priority_pktqueue.h
+++ b/tests/unittests/tests-priority_pktqueue/tests-priority_pktqueue.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Shuguo Zhuo <shuguo.zhuo@inria.fr>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Shuguo Zhuo <shuguo.zhuo@inria.fr>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-rtc/tests-rtc.c b/tests/unittests/tests-rtc/tests-rtc.c
index 8669aa6513b7..0da3e8e7fa94 100644
--- a/tests/unittests/tests-rtc/tests-rtc.c
+++ b/tests/unittests/tests-rtc/tests-rtc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-rtc/tests-rtc.h b/tests/unittests/tests-rtc/tests-rtc.h
index 78be937e6608..7ed84b20497a 100644
--- a/tests/unittests/tests-rtc/tests-rtc.h
+++ b/tests/unittests/tests-rtc/tests-rtc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-rtt_rtc/mock_rtt.c b/tests/unittests/tests-rtt_rtc/mock_rtt.c
index 0ebe027f480d..cd2d6ef27a55 100644
--- a/tests/unittests/tests-rtt_rtc/mock_rtt.c
+++ b/tests/unittests/tests-rtt_rtc/mock_rtt.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Benjamin Valentin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Benjamin Valentin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-rtt_rtc/tests-rtt_rtc.c b/tests/unittests/tests-rtt_rtc/tests-rtt_rtc.c
index 82059fbd8844..dea5e29cdeae 100644
--- a/tests/unittests/tests-rtt_rtc/tests-rtt_rtc.c
+++ b/tests/unittests/tests-rtt_rtc/tests-rtt_rtc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Benjamin Valentin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Benjamin Valentin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-rtt_rtc/tests-rtt_rtc.h b/tests/unittests/tests-rtt_rtc/tests-rtt_rtc.h
index 4ed2d8b468b1..013a0b4621f3 100644
--- a/tests/unittests/tests-rtt_rtc/tests-rtt_rtc.h
+++ b/tests/unittests/tests-rtt_rtc/tests-rtt_rtc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Benjamin Valentin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Benjamin Valentin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-saul_reg/tests-saul_reg.c b/tests/unittests/tests-saul_reg/tests-saul_reg.c
index 5b39e1fea848..cfebf0cbc4a6 100644
--- a/tests/unittests/tests-saul_reg/tests-saul_reg.c
+++ b/tests/unittests/tests-saul_reg/tests-saul_reg.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-saul_reg/tests-saul_reg.h b/tests/unittests/tests-saul_reg/tests-saul_reg.h
index 899d7e0a0eeb..c491df48326b 100644
--- a/tests/unittests/tests-saul_reg/tests-saul_reg.h
+++ b/tests/unittests/tests-saul_reg/tests-saul_reg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-scanf_float/tests-scanf_float.c b/tests/unittests/tests-scanf_float/tests-scanf_float.c
index 0172981cb212..1413118aff07 100644
--- a/tests/unittests/tests-scanf_float/tests-scanf_float.c
+++ b/tests/unittests/tests-scanf_float/tests-scanf_float.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-scanf_float/tests-scanf_float.h b/tests/unittests/tests-scanf_float/tests-scanf_float.h
index 51575af5eb46..7758f64f2e39 100644
--- a/tests/unittests/tests-scanf_float/tests-scanf_float.h
+++ b/tests/unittests/tests-scanf_float/tests-scanf_float.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-seq/tests-seq.c b/tests/unittests/tests-seq/tests-seq.c
index 0306f73dc496..759471310aca 100644
--- a/tests/unittests/tests-seq/tests-seq.c
+++ b/tests/unittests/tests-seq/tests-seq.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-seq/tests-seq.h b/tests/unittests/tests-seq/tests-seq.h
index 410883ac5d91..fe635e332e63 100644
--- a/tests/unittests/tests-seq/tests-seq.h
+++ b/tests/unittests/tests-seq/tests-seq.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-sht1x/tests-sht1x.c b/tests/unittests/tests-sht1x/tests-sht1x.c
index 8eccf5068573..2888be6f721c 100644
--- a/tests/unittests/tests-sht1x/tests-sht1x.c
+++ b/tests/unittests/tests-sht1x/tests-sht1x.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <sht1x.h>
diff --git a/tests/unittests/tests-sht1x/tests-sht1x.h b/tests/unittests/tests-sht1x/tests-sht1x.h
index 987d901de811..d0745881e67e 100644
--- a/tests/unittests/tests-sht1x/tests-sht1x.h
+++ b/tests/unittests/tests-sht1x/tests-sht1x.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-sixlowpan/tests-sixlowpan.c b/tests/unittests/tests-sixlowpan/tests-sixlowpan.c
index efc1e08df7f3..536bf2c803db 100644
--- a/tests/unittests/tests-sixlowpan/tests-sixlowpan.c
+++ b/tests/unittests/tests-sixlowpan/tests-sixlowpan.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Oliver Hahm <oliver.hahm@inria.fr>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Oliver Hahm <oliver.hahm@inria.fr>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-sixlowpan/tests-sixlowpan.h b/tests/unittests/tests-sixlowpan/tests-sixlowpan.h
index a118e4a720a3..815aa4e819c7 100644
--- a/tests/unittests/tests-sixlowpan/tests-sixlowpan.h
+++ b/tests/unittests/tests-sixlowpan/tests-sixlowpan.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Oliver Hahm <oliver.hahm@inria.fr>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Oliver Hahm <oliver.hahm@inria.fr>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-sixlowpan_ctx/tests-sixlowpan_ctx.c b/tests/unittests/tests-sixlowpan_ctx/tests-sixlowpan_ctx.c
index e4dfb9d40f82..4146f4d0c226 100644
--- a/tests/unittests/tests-sixlowpan_ctx/tests-sixlowpan_ctx.c
+++ b/tests/unittests/tests-sixlowpan_ctx/tests-sixlowpan_ctx.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-sixlowpan_ctx/tests-sixlowpan_ctx.h b/tests/unittests/tests-sixlowpan_ctx/tests-sixlowpan_ctx.h
index ea2ee787751c..4372f6c131e7 100644
--- a/tests/unittests/tests-sixlowpan_ctx/tests-sixlowpan_ctx.h
+++ b/tests/unittests/tests-sixlowpan_ctx/tests-sixlowpan_ctx.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-sixlowpan_sfr/tests-sixlowpan_sfr.c b/tests/unittests/tests-sixlowpan_sfr/tests-sixlowpan_sfr.c
index faa830ac1803..6508ca43dd54 100644
--- a/tests/unittests/tests-sixlowpan_sfr/tests-sixlowpan_sfr.c
+++ b/tests/unittests/tests-sixlowpan_sfr/tests-sixlowpan_sfr.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-sixlowpan_sfr/tests-sixlowpan_sfr.h b/tests/unittests/tests-sixlowpan_sfr/tests-sixlowpan_sfr.h
index 8253cde9acbe..3817b27ccb98 100644
--- a/tests/unittests/tests-sixlowpan_sfr/tests-sixlowpan_sfr.h
+++ b/tests/unittests/tests-sixlowpan_sfr/tests-sixlowpan_sfr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-sock_util/tests-sock_util.c b/tests/unittests/tests-sock_util/tests-sock_util.c
index 627f5b5f3f8e..cef8f123e38d 100644
--- a/tests/unittests/tests-sock_util/tests-sock_util.c
+++ b/tests/unittests/tests-sock_util/tests-sock_util.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- * Copyright (C) 2018 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-sock_util/tests-sock_util.h b/tests/unittests/tests-sock_util/tests-sock_util.h
index 8ca62d947526..1e1b48bd54ac 100644
--- a/tests/unittests/tests-sock_util/tests-sock_util.h
+++ b/tests/unittests/tests-sock_util/tests-sock_util.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- * Copyright (C) 2018 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-timex/tests-timex.c b/tests/unittests/tests-timex/tests-timex.c
index 1e926474683b..88071aabc5ca 100644
--- a/tests/unittests/tests-timex/tests-timex.c
+++ b/tests/unittests/tests-timex/tests-timex.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2014 Philipp Rosenkranz, Daniel Jentsch
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Philipp Rosenkranz, Daniel Jentsch
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include "tests-timex.h"
diff --git a/tests/unittests/tests-timex/tests-timex.h b/tests/unittests/tests-timex/tests-timex.h
index 41f9a3456812..3ccbf23a30c3 100644
--- a/tests/unittests/tests-timex/tests-timex.h
+++ b/tests/unittests/tests-timex/tests-timex.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Philipp Rosenkranz, Daniel Jentsch
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Philipp Rosenkranz, Daniel Jentsch
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-tsrb/tests-tsrb.c b/tests/unittests/tests-tsrb/tests-tsrb.c
index 028d75c7f7cc..72dee03b534e 100644
--- a/tests/unittests/tests-tsrb/tests-tsrb.c
+++ b/tests/unittests/tests-tsrb/tests-tsrb.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-tsrb/tests-tsrb.h b/tests/unittests/tests-tsrb/tests-tsrb.h
index 75ba989b2e76..e68a1ce507b1 100644
--- a/tests/unittests/tests-tsrb/tests-tsrb.h
+++ b/tests/unittests/tests-tsrb/tests-tsrb.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-turo/tests-turo.c b/tests/unittests/tests-turo/tests-turo.c
index 3089de8b31d7..d5736e5c69a7 100644
--- a/tests/unittests/tests-turo/tests-turo.c
+++ b/tests/unittests/tests-turo/tests-turo.c
@@ -1,10 +1,8 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
+
 /**
  * @ingroup    tests
  * @{
diff --git a/tests/unittests/tests-unicoap/tests-unicoap-message.c b/tests/unittests/tests-unicoap/tests-unicoap-message.c
index 9e399c84816e..4fd8d037175f 100644
--- a/tests/unittests/tests-unicoap/tests-unicoap-message.c
+++ b/tests/unittests/tests-unicoap/tests-unicoap-message.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-unicoap/tests-unicoap-options.c b/tests/unittests/tests-unicoap/tests-unicoap-options.c
index 2ac421cbc952..495be248d88e 100644
--- a/tests/unittests/tests-unicoap/tests-unicoap-options.c
+++ b/tests/unittests/tests-unicoap/tests-unicoap-options.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-unicoap/tests-unicoap-pdu.c b/tests/unittests/tests-unicoap/tests-unicoap-pdu.c
index 9ac1909a6371..fe58ca80f857 100644
--- a/tests/unittests/tests-unicoap/tests-unicoap-pdu.c
+++ b/tests/unittests/tests-unicoap/tests-unicoap-pdu.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-unicoap/tests-unicoap.c b/tests/unittests/tests-unicoap/tests-unicoap.c
index 43fba0c2d771..1b0fd27e9549 100644
--- a/tests/unittests/tests-unicoap/tests-unicoap.c
+++ b/tests/unittests/tests-unicoap/tests-unicoap.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-unicoap/tests-unicoap.h b/tests/unittests/tests-unicoap/tests-unicoap.h
index 808e47198962..b8fd12b0048d 100644
--- a/tests/unittests/tests-unicoap/tests-unicoap.h
+++ b/tests/unittests/tests-unicoap/tests-unicoap.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-uri_parser/tests-uri_parser.c b/tests/unittests/tests-uri_parser/tests-uri_parser.c
index 32888438c84b..ec13f130e30f 100644
--- a/tests/unittests/tests-uri_parser/tests-uri_parser.c
+++ b/tests/unittests/tests-uri_parser/tests-uri_parser.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 2022 Bennet Blischke / HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Bennet Hattesen
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-uri_parser/tests-uri_parser.h b/tests/unittests/tests-uri_parser/tests-uri_parser.h
index a926c60b0e75..dbdd0322f73d 100644
--- a/tests/unittests/tests-uri_parser/tests-uri_parser.h
+++ b/tests/unittests/tests-uri_parser/tests-uri_parser.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-ut_process/tests-ut_process.c b/tests/unittests/tests-ut_process/tests-ut_process.c
index 321c8d2b4760..4a477ab42607 100644
--- a/tests/unittests/tests-ut_process/tests-ut_process.c
+++ b/tests/unittests/tests-ut_process/tests-ut_process.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ut_process/tests-ut_process.h b/tests/unittests/tests-ut_process/tests-ut_process.h
index 6774efffee97..8bdddb1c0381 100644
--- a/tests/unittests/tests-ut_process/tests-ut_process.h
+++ b/tests/unittests/tests-ut_process/tests-ut_process.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-uuid/tests-uuid.c b/tests/unittests/tests-uuid/tests-uuid.c
index 3b263813892d..b20ebb6c66aa 100644
--- a/tests/unittests/tests-uuid/tests-uuid.c
+++ b/tests/unittests/tests-uuid/tests-uuid.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- * Copyright (C) 2018 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-uuid/tests-uuid.h b/tests/unittests/tests-uuid/tests-uuid.h
index a39801a792c6..b8d2bc6e957e 100644
--- a/tests/unittests/tests-uuid/tests-uuid.h
+++ b/tests/unittests/tests-uuid/tests-uuid.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- * Copyright (C) 2018 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-vfs/tests-vfs-bind.c b/tests/unittests/tests-vfs/tests-vfs-bind.c
index 7bd0b9783b12..d7d05370b017 100644
--- a/tests/unittests/tests-vfs/tests-vfs-bind.c
+++ b/tests/unittests/tests-vfs/tests-vfs-bind.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-vfs/tests-vfs-dir-ops.c b/tests/unittests/tests-vfs/tests-vfs-dir-ops.c
index cfa38cefa954..3d30349ca7cd 100644
--- a/tests/unittests/tests-vfs/tests-vfs-dir-ops.c
+++ b/tests/unittests/tests-vfs/tests-vfs-dir-ops.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-vfs/tests-vfs-file-ops.c b/tests/unittests/tests-vfs/tests-vfs-file-ops.c
index 1a588de6f5fc..a848a34af35b 100644
--- a/tests/unittests/tests-vfs/tests-vfs-file-ops.c
+++ b/tests/unittests/tests-vfs/tests-vfs-file-ops.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-vfs/tests-vfs-file-system-ops.c b/tests/unittests/tests-vfs/tests-vfs-file-system-ops.c
index 27c87c5033db..707ad04bea4e 100644
--- a/tests/unittests/tests-vfs/tests-vfs-file-system-ops.c
+++ b/tests/unittests/tests-vfs/tests-vfs-file-system-ops.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-vfs/tests-vfs-mount-constfs.c b/tests/unittests/tests-vfs/tests-vfs-mount-constfs.c
index cf9f05add4fd..1aadac5b17ac 100644
--- a/tests/unittests/tests-vfs/tests-vfs-mount-constfs.c
+++ b/tests/unittests/tests-vfs/tests-vfs-mount-constfs.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-vfs/tests-vfs-normalize_path.c b/tests/unittests/tests-vfs/tests-vfs-normalize_path.c
index 6e6d6fb8e9e7..711ebe15b205 100644
--- a/tests/unittests/tests-vfs/tests-vfs-normalize_path.c
+++ b/tests/unittests/tests-vfs/tests-vfs-normalize_path.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-vfs/tests-vfs-open-close.c b/tests/unittests/tests-vfs/tests-vfs-open-close.c
index 4b14365fd521..976c59e103ce 100644
--- a/tests/unittests/tests-vfs/tests-vfs-open-close.c
+++ b/tests/unittests/tests-vfs/tests-vfs-open-close.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-vfs/tests-vfs.c b/tests/unittests/tests-vfs/tests-vfs.c
index c8c91489f58c..1b047fd8eac3 100644
--- a/tests/unittests/tests-vfs/tests-vfs.c
+++ b/tests/unittests/tests-vfs/tests-vfs.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-vfs/tests-vfs.h b/tests/unittests/tests-vfs/tests-vfs.h
index 10b87c445dcc..4667b8a0465a 100644
--- a/tests/unittests/tests-vfs/tests-vfs.h
+++ b/tests/unittests/tests-vfs/tests-vfs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-zptr/tests-zptr.c b/tests/unittests/tests-zptr/tests-zptr.c
index e08c3e520de7..f8a1bfed4668 100644
--- a/tests/unittests/tests-zptr/tests-zptr.c
+++ b/tests/unittests/tests-zptr/tests-zptr.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-zptr/tests-zptr.h b/tests/unittests/tests-zptr/tests-zptr.h
index 0f85c4c23726..e747bcef6f77 100644
--- a/tests/unittests/tests-zptr/tests-zptr.h
+++ b/tests/unittests/tests-zptr/tests-zptr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-ztimer/tests-ztimer-convert-muldiv64.c b/tests/unittests/tests-ztimer/tests-ztimer-convert-muldiv64.c
index 2de857866325..0dee906e2220 100644
--- a/tests/unittests/tests-ztimer/tests-ztimer-convert-muldiv64.c
+++ b/tests/unittests/tests-ztimer/tests-ztimer-convert-muldiv64.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ztimer/tests-ztimer-mock.c b/tests/unittests/tests-ztimer/tests-ztimer-mock.c
index 7c3001fdda5b..baaae93b4ab0 100644
--- a/tests/unittests/tests-ztimer/tests-ztimer-mock.c
+++ b/tests/unittests/tests-ztimer/tests-ztimer-mock.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ztimer/tests-ztimer-ondemand.c b/tests/unittests/tests-ztimer/tests-ztimer-ondemand.c
index 877e4622a6f5..84a85b2573b5 100644
--- a/tests/unittests/tests-ztimer/tests-ztimer-ondemand.c
+++ b/tests/unittests/tests-ztimer/tests-ztimer-ondemand.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 SSV Software Systems GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 SSV Software Systems GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ztimer/tests-ztimer.c b/tests/unittests/tests-ztimer/tests-ztimer.c
index 107956e47e04..6f103c9e3f16 100644
--- a/tests/unittests/tests-ztimer/tests-ztimer.c
+++ b/tests/unittests/tests-ztimer/tests-ztimer.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ztimer/tests-ztimer.h b/tests/unittests/tests-ztimer/tests-ztimer.h
index a629ba63fa5a..ba007e2919a5 100644
--- a/tests/unittests/tests-ztimer/tests-ztimer.h
+++ b/tests/unittests/tests-ztimer/tests-ztimer.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/tests/unittests/tests-ztimer64/tests-ztimer64-core.c b/tests/unittests/tests-ztimer64/tests-ztimer64-core.c
index a390f11e30a7..456cb35b8867 100644
--- a/tests/unittests/tests-ztimer64/tests-ztimer64-core.c
+++ b/tests/unittests/tests-ztimer64/tests-ztimer64-core.c
@@ -1,7 +1,5 @@
 /*
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ztimer64/tests-ztimer64.c b/tests/unittests/tests-ztimer64/tests-ztimer64.c
index 6fd2339cddde..e1b8386b3617 100644
--- a/tests/unittests/tests-ztimer64/tests-ztimer64.c
+++ b/tests/unittests/tests-ztimer64/tests-ztimer64.c
@@ -1,7 +1,5 @@
 /*
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-ztimer64/tests-ztimer64.h b/tests/unittests/tests-ztimer64/tests-ztimer64.h
index 8d0dc8f35a9c..76c9dd566e39 100644
--- a/tests/unittests/tests-ztimer64/tests-ztimer64.h
+++ b/tests/unittests/tests-ztimer64/tests-ztimer64.h
@@ -1,7 +1,5 @@
 /*
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once

From 05f0217306fa572b26bc5ded85fce6eaa57967b3 Mon Sep 17 00:00:00 2001
From: Marian Buschsieweke <marian.buschsieweke@ml-pa.com>
Date: Wed, 19 Nov 2025 17:48:51 +0100
Subject: [PATCH 2/2] tests/{riotboot*,rust*,turo*}: use SPDX copyright tags

---
 tests/riotboot/main.c                                    | 9 +++------
 tests/riotboot_flashwrite/coap_handler.c                 | 7 ++-----
 tests/riotboot_flashwrite/main.c                         | 7 ++-----
 tests/riotboot_hdr/main.c                                | 7 ++-----
 tests/rust_minimal/src/lib.rs                            | 7 ++-----
 tests/turo/main.c                                        | 7 ++-----
 .../unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.h  | 2 +-
 tests/unittests/tests-inet_csum/tests-inet_csum.h        | 2 +-
 tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.h          | 2 +-
 tests/unittests/tests-netreg/tests-netreg.h              | 2 +-
 10 files changed, 17 insertions(+), 35 deletions(-)

diff --git a/tests/riotboot/main.c b/tests/riotboot/main.c
index 802d50671c01..35b6c739e85a 100644
--- a/tests/riotboot/main.c
+++ b/tests/riotboot/main.c
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2018 Inria
- *                    Federico Pellegrin <fede@evolware.org>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-FileCopyrightText: 2018 Federico Pellegrin <fede@evolware.org>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/riotboot_flashwrite/coap_handler.c b/tests/riotboot_flashwrite/coap_handler.c
index 12a09de83916..2e18f24187ca 100644
--- a/tests/riotboot_flashwrite/coap_handler.c
+++ b/tests/riotboot_flashwrite/coap_handler.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <stdlib.h>
diff --git a/tests/riotboot_flashwrite/main.c b/tests/riotboot_flashwrite/main.c
index 56b14268cdb2..43950c20f2d8 100644
--- a/tests/riotboot_flashwrite/main.c
+++ b/tests/riotboot_flashwrite/main.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/riotboot_hdr/main.c b/tests/riotboot_hdr/main.c
index 109dff56bbe7..8291b9d06807 100644
--- a/tests/riotboot_hdr/main.c
+++ b/tests/riotboot_hdr/main.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/rust_minimal/src/lib.rs b/tests/rust_minimal/src/lib.rs
index bbf1a1a73191..41385c02c4d7 100644
--- a/tests/rust_minimal/src/lib.rs
+++ b/tests/rust_minimal/src/lib.rs
@@ -1,8 +1,5 @@
-// Copyright (C) 2020 Christian Amsüss
-//
-// This file is subject to the terms and conditions of the GNU Lesser
-// General Public License v2.1. See the file LICENSE in the top level
-// directory for more details.
+// SPDX-FileCopyrightText: 2020 Christian Amsüss
+// SPDX-License-Identifier: LGPL-2.1-only
 #![no_std]
 
 use riot_wrappers::println;
diff --git a/tests/turo/main.c b/tests/turo/main.c
index 765b1664303e..be716c401cc4 100644
--- a/tests/turo/main.c
+++ b/tests/turo/main.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.h b/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.h
index 088037458ca5..fa16972a9b31 100644
--- a/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.h
+++ b/tests/unittests/tests-gnrc_ipv6_hdr/tests-gnrc_ipv6_hdr.h
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015 Martin Lenders
+ * SPDX-FileCopyrightText: 2015 Martine Lenders
  * SPDX-License-Identifier: LGPL-2.1-only
  */
 
diff --git a/tests/unittests/tests-inet_csum/tests-inet_csum.h b/tests/unittests/tests-inet_csum/tests-inet_csum.h
index c7aa007f920e..515718c49e47 100644
--- a/tests/unittests/tests-inet_csum/tests-inet_csum.h
+++ b/tests/unittests/tests-inet_csum/tests-inet_csum.h
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015 Martin Lenders
+ * SPDX-FileCopyrightText: 2015 Martine Lenders
  * SPDX-License-Identifier: LGPL-2.1-only
  */
 
diff --git a/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.h b/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.h
index 1d1e7e950a4a..161c79717e48 100644
--- a/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.h
+++ b/tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.h
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015 Martin Lenders
+ * SPDX-FileCopyrightText: 2015 Martine Lenders
  * SPDX-License-Identifier: LGPL-2.1-only
  */
 
diff --git a/tests/unittests/tests-netreg/tests-netreg.h b/tests/unittests/tests-netreg/tests-netreg.h
index f606a7fb4c83..6cd2843d10d9 100644
--- a/tests/unittests/tests-netreg/tests-netreg.h
+++ b/tests/unittests/tests-netreg/tests-netreg.h
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2014 Martin Lenders
+ * SPDX-FileCopyrightText: 2014 Martine Lenders
  * SPDX-License-Identifier: LGPL-2.1-only
  */