posix: sched: Implement tests for sched_rr_get_interval

Implement tests for `sched_rr_get_interval()` .
Function is actually placeholders and just return `ENOSYS`
since Zephyr does not yet support processes or process scheduling.

signed-off-by: Gaetan Perrot <[email protected]>

Author: moonlight83340

tests/posix/common/src/pthread.c

@@ -428,6 +428,18 @@ ZTEST(pthread, test_sched_setscheduler)
 	zassert_true((rc == -1 && err == ENOSYS));
 }
 
+ZTEST(pthread, test_sched_rr_get_interval)
+{
+	struct timespec interval = {
+		.tv_sec = 0,
+		.tv_nsec = 0,
+	};
+	int rc = sched_rr_get_interval(0, &interval);
+	int err = errno;
+
+	zassert_true((rc == -1 && err == ENOSYS));
+}
+
 ZTEST(pthread, test_pthread_equal)
 {
 	zassert_true(pthread_equal(pthread_self(), pthread_self()));

tests/posix/headers/src/sched_h.c

@@ -33,7 +33,7 @@ ZTEST(posix_headers, test_sched_h)
 		zassert_not_null(sched_getparam);
 		zassert_not_null(sched_getscheduler);
 
-		/* zassert_not_null(sched_rr_get_interval); */ /* not implemented */
+		zassert_not_null(sched_rr_get_interval);
 
 		zassert_not_null(sched_setparam);
 		zassert_not_null(sched_setscheduler);