diff --git a/score/os/test/time_test.cpp b/score/os/test/time_test.cpp
index 8326bfb2..78f8fed8 100644
--- a/score/os/test/time_test.cpp
+++ b/score/os/test/time_test.cpp
@@ -531,6 +531,120 @@ TEST(TimeImplTest, TimerWithSigEvSignalNotificationIsSuccessful)
     Time::instance().timer_delete(timerid);
 }
 
+TEST(TimeImplTest, ClockGetCpuClockIdWithCurrentProcess)
+{
+    RecordProperty("Verifies", "SCR-46010294");
+    RecordProperty("ASIL", "B");
+    RecordProperty("Description", "Verifies Clock Get Cpu Clock Id Success With Current Process Pid Zero");
+    RecordProperty("TestType", "Interface test");
+    RecordProperty("DerivationTechnique", "Generation and analysis of equivalence classes");
+
+    // POSIX specifies that pid 0 refers to the calling process.
+    // This is more portable than using pid 1 (init), which may not be accessible
+    // on all systems or under all privilege levels.
+    clockid_t clock_id{};
+    const pid_t calling_process{0};
+
+    const auto result = Time::instance().clock_getcpuclockid(calling_process, clock_id);
+    EXPECT_TRUE(result.has_value());
+    EXPECT_EQ(result.value(), 0);
+
+    // Verify the returned clock_id is usable
+    struct timespec ts{};
+    const auto gettime_result = Time::instance().clock_gettime(clock_id, &ts);
+    EXPECT_TRUE(gettime_result.has_value());
+}
+
+TEST(TimeImplTest, TimerSettimeWithAbsoluteTimeFlag)
+{
+    RecordProperty("Verifies", "SCR-46010294");
+    RecordProperty("ASIL", "B");
+    RecordProperty("Description", "Verifies Timer Settime Success With Absolute Time Flag");
+    RecordProperty("TestType", "Interface test");
+    RecordProperty("DerivationTechnique", "Generation and analysis of equivalence classes");
+
+    timer_t timerid{};
+    sigevent event{};
+    event.sigev_notify = SIGEV_NONE;
+
+    const auto create_result = Time::instance().timer_create(CLOCK_REALTIME, &event, &timerid);
+    ASSERT_TRUE(create_result.has_value());
+
+    // Get current absolute time and compute an expiration 200ms in the future
+    struct timespec now{};
+    ::clock_gettime(CLOCK_REALTIME, &now);
+
+    itimerspec new_value{};
+    new_value.it_value.tv_sec  = now.tv_sec;
+    new_value.it_value.tv_nsec = now.tv_nsec + 200000000L;  // +200ms
+    if (new_value.it_value.tv_nsec >= 1000000000L)
+    {
+        new_value.it_value.tv_nsec -= 1000000000L;
+        new_value.it_value.tv_sec += 1;
+    }
+    new_value.it_interval.tv_sec  = 0;
+    new_value.it_interval.tv_nsec = 0;
+
+    // TIMER_ABSTIME: treat it_value as an absolute CLOCK_REALTIME timestamp
+    const auto settime_result = Time::instance().timer_settime(timerid, TIMER_ABSTIME, &new_value, nullptr);
+    EXPECT_TRUE(settime_result.has_value());
+    EXPECT_EQ(settime_result.value(), 0);
+
+    // Verify the timer is armed with a remaining time <= 200ms
+    itimerspec current_value{};
+    const std::int32_t gettime_result = ::timer_gettime(timerid, &current_value);
+    EXPECT_EQ(gettime_result, 0);
+    EXPECT_GT(current_value.it_value.tv_sec + current_value.it_value.tv_nsec, 0);
+
+    Time::instance().timer_delete(timerid);
+}
+
+TEST(TimeImplTest, TimerSettimeOldValueReflectsPreviousArming)
+{
+    RecordProperty("Verifies", "SCR-46010294");
+    RecordProperty("ASIL", "B");
+    RecordProperty("Description", "Verifies Timer Settime Old Value Reflects Previous Arming");
+    RecordProperty("TestType", "Interface test");
+    RecordProperty("DerivationTechnique", "Generation and analysis of equivalence classes");
+
+    timer_t timerid{};
+    sigevent event{};
+    event.sigev_notify = SIGEV_NONE;
+
+    const auto create_result = Time::instance().timer_create(CLOCK_REALTIME, &event, &timerid);
+    ASSERT_TRUE(create_result.has_value());
+
+    // Arm the timer with a long expiration so it is still live when we re-arm
+    itimerspec first_value{};
+    first_value.it_value.tv_sec  = 10;  // 10 seconds — well beyond the test duration
+    first_value.it_value.tv_nsec = 0;
+    first_value.it_interval.tv_sec  = 0;
+    first_value.it_interval.tv_nsec = 0;
+
+    const auto first_settime = Time::instance().timer_settime(timerid, 0, &first_value, nullptr);
+    ASSERT_TRUE(first_settime.has_value());
+
+    // Re-arm immediately; ovalue must reflect the remaining time of the first arming
+    itimerspec second_value{};
+    second_value.it_value.tv_sec  = 1;
+    second_value.it_value.tv_nsec = 0;
+    second_value.it_interval.tv_sec  = 0;
+    second_value.it_interval.tv_nsec = 0;
+
+    itimerspec old_value{};
+    const auto second_settime = Time::instance().timer_settime(timerid, 0, &second_value, &old_value);
+    EXPECT_TRUE(second_settime.has_value());
+    EXPECT_EQ(second_settime.value(), 0);
+
+    // ovalue must report that the previous timer had ~10s remaining (at least 8s to allow for scheduling jitter)
+    const std::int64_t remaining_ns =
+        (static_cast<std::int64_t>(old_value.it_value.tv_sec) * 1000000000L) + old_value.it_value.tv_nsec;
+    EXPECT_GT(remaining_ns, 8000000000LL);   // > 8 seconds remaining
+    EXPECT_LE(remaining_ns, 10000000000LL);  // <= 10 seconds (original value)
+
+    Time::instance().timer_delete(timerid);
+}
+
 }  // namespace
 }  // namespace os
 }  // namespace score