add tests for Event.wait and AsyncResult.wait

greentest/test__asyncresult.py

 import greentest
 import gevent
-from gevent.event import AsyncResult
+from gevent.event import Event, AsyncResult
 
 DELAY = 0.01
 
+class TestEventWait(greentest.GenericWaitTestCase):
+
+    def wait(self, timeout):
+        Event().wait(timeout=timeout)
+
+class TestAsyncResultWait(greentest.GenericWaitTestCase):
+
+    def wait(self, timeout):
+        AsyncResult().wait(timeout=timeout)
+
+
 class TestAsyncResult(greentest.TestCase):
 
     def test_set_exc(self):