diff --git a/unittests/unittests_reactive_extenstions/reactive_test_case.py b/unittests/unittests_reactive_extenstions/reactive_test_case.py
index a0cff291..f6647707 100644
--- a/unittests/unittests_reactive_extenstions/reactive_test_case.py
+++ b/unittests/unittests_reactive_extenstions/reactive_test_case.py
@@ -71,18 +71,23 @@ class ReactiveTestCase(unittest.TestCase):
 
         Timer(1.0, complete).start()
 
-        time.sleep(2)
+    def test_observer_completed(self):
+        reached = False
 
         def _test_complete(x: Observer):
+            nonlocal reached
+
             x.next(1)
             x.next(2)
             x.complete()
+            reached = True
             x.next(3)
 
-        observable2 = Observable(_test_complete)
+        observable = Observable(_test_complete)
 
-        observable2.subscribe(lambda x: x, self._on_error)
-        self.assertTrue(self._error)
+        observable.subscribe(lambda x: Console.write_line(1, x), self._on_error)
+        self.assertFalse(reached)
+        self.assertFalse(self._error)
 
     def test_observable_from(self):
         expected_x = 1