testing/ostest: add nxevent_clear() test cases

    Add test cases to verify the new recently added nxevent_clear() api

Signed-off-by: Chengdong Wang <wangchengdong@lixiang.com>

Author: wangchdo

testing/ostest/nxevent.c

@@ -328,6 +328,34 @@ void nxevent_test(void)
   pthread_join(tid1, NULL);
   pthread_join(tid2, NULL);
 
+  /**************************************************************************/
+
+  /* 4. Event clear Test */
+
+  nxevent_post(&event, 0xff, NXEVENT_POST_SET);
+
+  /* Case 4.1: clear == 0, trywait == 0xf, wait == 0xf */
+
+  nxevent_clear(&event, 0);
+  NXEVENT_TEST(nxevent_wait(&event, 0xf, NXEVENT_WAIT_NOCLEAR), 0xf);
+  NXEVENT_TEST(nxevent_trywait(&event, 0xf, NXEVENT_WAIT_NOCLEAR), 0xf);
+
+  /* Case 4.2: clear == 0xf, trywait == 0xf */
+
+  nxevent_clear(&event, 0xf);
+  NXEVENT_TEST(nxevent_trywait(&event, 0xf, NXEVENT_WAIT_NOCLEAR), 0);
+
+  /* Case 4.3: clear == 0, trywait == 0xf0, wait == 0xf0 */
+
+  nxevent_clear(&event, 0);
+  NXEVENT_TEST(nxevent_wait(&event, 0xf0, NXEVENT_WAIT_NOCLEAR), 0xf0);
+  NXEVENT_TEST(nxevent_trywait(&event, 0xf0, NXEVENT_WAIT_NOCLEAR), 0xf0);
+
+  /* Case 4.4: clear == 0xf0, wait == 0xf0 */
+
+  nxevent_clear(&event, 0xf0);
+  NXEVENT_TEST(nxevent_trywait(&event, 0xf0, NXEVENT_WAIT_NOCLEAR), 0);
+
   nxevent_reset(&event, 0);
   nxevent_destroy(&event);
 }