Increase timeout for ray.wait test (#5273)

* Increase test timeout for ray.wait

* make sure the actor is scheduled

python/ray/tests/test_actor.py

@@ -2680,7 +2680,7 @@ def decorated_method(self, x):
 @pytest.mark.skipif(
     pytest_timeout is None,
     reason="Timeout package not installed; skipping test that may hang.")
-@pytest.mark.timeout(10)
+@pytest.mark.timeout(20)
 @pytest.mark.parametrize(
     "ray_start_cluster", [{
         "num_cpus": 1,
@@ -2744,9 +2744,13 @@ def wait(self):
             _, self.unready = ray.wait(self.unready, timeout=0)
             return len(self.unready) == 0
 
+        def ping(self):
+            return
+
     # Repeatedly call ray.wait through the local actor until the exception for
     # the dead actor is received.
     parent_actor = ParentActor.remote(ping_ids)
+    ray.get(parent_actor.ping.remote())
     failure_detected = False
     while not failure_detected:
         failure_detected = ray.get(parent_actor.wait.remote())