diff --git a/tests/shunit2/_common_test.sh b/tests/shunit2/_common_test.sh
new file mode 100755
index 000000000..f03505933
--- /dev/null
+++ b/tests/shunit2/_common_test.sh
@@ -0,0 +1,98 @@
+#!/usr/bin/env bash
+
+# shellcheck disable=SC2034 # shunit2 constant
+readonly SHUNIT_TEST_PREFIX="_common.sh__"
+
+function oneTimeSetUp {
+  # Load stuff for tests.
+  . ../../hooks/_common.sh
+  # Global ENV vars in --args
+  export CONFIG_FILE=.tflint.hcl
+  export CONFIG_NAME=.tflint
+  export CONFIG_EXT=hcl
+  # Disable hooks clolrs
+  export PRE_COMMIT_COLOR="never"
+}
+
+function test__HOOK_ID {
+  assertEquals "_common_test" "$HOOK_ID"
+}
+
+# function test__initialize {
+#   Nothing to test?
+# }
+
+function test__parse_cmdline {
+  # Pass test parameters to the function being tested
+  # shellcheck disable=SC2016 # IT should not expand
+  common::parse_cmdline \
+    '--args=--config-file=.tfsec.json' \
+    "--hook-config='.totalHourlyCost >= 0.1'" \
+    '--init-args=-get=true' \
+    '--tf-init-args=-get=true' \
+    '--envs=AWS_DEFAULT_REGION="us-west-2"' \
+    '--env-vars=AWS_ACCESS_KEY_ID="anaccesskey"' \
+    \
+    '-a --force-all-dirs' \
+    '-h ".totalHourlyCost|tonumber > 1"' \
+    '-i -upgrade' \
+    '-e AWS_SECRET_ACCESS_KEY="asecretkey"' \
+    \
+    '--args=--exclude-downloaded-modules' \
+    '-h ".projects[].diff.totalMonthlyCost|tonumber!=10000"' \
+    '-h [.projects[].diff.totalMonthlyCost | select (.!=null) | tonumber] | add > 1000' \
+    '--hook-config=--retry-once-with-cleanup=true' \
+    '-a --concise-output' \
+    '--args=--config-file=__GIT_WORKING_DIR__/.tfsec.json' \
+    '--hook-config=--retry-once-with-cleanup=true' \
+    '--args=--config=__GIT_WORKING_DIR__/${CONFIG_FILE}' \
+    '-a --config=__GIT_WORKING_DIR__/${CONFIG_NAME}.${CONFIG_EXT}' \
+    'environment/qa/backends.tf' \
+    'environment/qa/main.tf' \
+    'modules/aws-environment/lambdas.tf' \
+    'environment/qa/data.tf' \
+    'environment/qa/outputs.tf' \
+    'environment/qa/versions.tf'
+
+  #
+  # Test Global ENVs changes
+  #
+
+  # shellcheck disable=SC2016 # IT should not expand
+  local expected='--config-file=.tfsec.json --force-all-dirs --exclude-downloaded-modules --concise-output --config-file=__GIT_WORKING_DIR__/.tfsec.json --config=__GIT_WORKING_DIR__/${CONFIG_FILE} --config=__GIT_WORKING_DIR__/${CONFIG_NAME}.${CONFIG_EXT}'
+  assertEquals "ARGS -" "$expected" "${ARGS[*]}"
+  # Extra space for `-h`. No matter, because in function it spitted to array by spaces
+  local expected="'.totalHourlyCost >= 0.1';  \".totalHourlyCost|tonumber > 1\";  \".projects[].diff.totalMonthlyCost|tonumber!=10000\";  [.projects[].diff.totalMonthlyCost | select (.!=null) | tonumber] | add > 1000; --retry-once-with-cleanup=true; --retry-once-with-cleanup=true;"
+  assertEquals "HOOK_CONFIG -" "$expected" "${HOOK_CONFIG[*]}"
+  # Extra space for `-i`.No matter, because in function it spitted to array by spaces
+  local expected='-get=true -get=true  -upgrade'
+  assertEquals "TF_INIT_ARGS -" "$expected" "${TF_INIT_ARGS[*]}"
+  # Extra space for `-e`. No matter, because in function it spitted to array by spaces
+  local expected='AWS_DEFAULT_REGION="us-west-2" AWS_ACCESS_KEY_ID="anaccesskey"  AWS_SECRET_ACCESS_KEY="asecretkey"'
+  assertEquals "ENV_VARS -" "$expected" "${ENV_VARS[*]}"
+
+  local expected='environment/qa/backends.tf environment/qa/main.tf modules/aws-environment/lambdas.tf environment/qa/data.tf environment/qa/outputs.tf environment/qa/versions.tf'
+  assertEquals "FILES -" "$expected" "${FILES[*]}"
+}
+
+function test__parse_and_export_env_vars {
+  # Init "GLOBAL ENV"
+  # shellcheck disable=SC2016 # IT should not expand
+  local ARGS=(
+    '--args=--config=__GIT_WORKING_DIR__/${CONFIG_FILE}'
+    '--args=--config=__GIT_WORKING_DIR__/${CONFIG_NAME}.${CONFIG_EXT}'
+    '--args=--module'
+  )
+  # Pass test parameters to the function being tested (only GLOBAL ENV - ARGS)
+  common::parse_and_export_env_vars
+
+  local expected=(
+    '--args=--config=__GIT_WORKING_DIR__/.tflint.hcl'
+    '--args=--config=__GIT_WORKING_DIR__/.tflint.hcl'
+    '--args=--module'
+  )
+  assertEquals "${expected[*]}" "${ARGS[*]}"
+}
+
+# Load shUnit2. File populated to PATH from https://github.com/kward/shunit2
+. shunit2