POSIX: Add tests for pthread_condattr

Add test coverage for init, destroy, setclock, getclock

Signed-off-by: Mateusz Marszalek <matti.marszalek@gmail.com>

tests/posix/common/src/pthread.c

@@ -233,6 +233,28 @@ void *thread_top_term(void *p1)
  return NULL;
 }
 
+ZTEST(posix_apis, test_pthread_condattr)
+{
+ clockid_t clock_id;
+ pthread_condattr_t att;
+
+ zassert_ok(pthread_condattr_init(&att), "pthread_condattr_init failed");
+
+ zassert_ok(pthread_condattr_getclock(&att, &clock_id), "pthread_condattr_getclock failed");
+ zassert_equal(clock_id, CLOCK_MONOTONIC, "clock attribute not set correctly");
+
+ zassert_ok(pthread_condattr_setclock(&att, CLOCK_REALTIME),
+ "pthread_condattr_setclock failed");
+
+ zassert_ok(pthread_condattr_getclock(&att, &clock_id), "pthread_condattr_setclock failed");
+ zassert_equal(clock_id, CLOCK_REALTIME, "clock attribute not set correctly");
+
+ zassert_equal(pthread_condattr_setclock(&att, 42),
+ -EINVAL, "pthread_condattr_setclock did not return EINVAL");
+
+ zassert_ok(pthread_condattr_destroy(&att), "pthread_condattr_destroy failed");
+}
+
 ZTEST(posix_apis, test_pthread_execution)
 {
  int i, ret, min_prio, max_prio;