bpo-36888, test_multiprocessing: Increase test_parent_process timeout (GH-14286)

Lib/test/_test_multiprocessing.py

@@ -301,7 +301,7 @@ class _TestProcess(BaseTestCase):
             target=self._test_create_grandchild_process, args=(wconn, ))
         p.start()
 
-        if not rconn.poll(timeout=5):
+        if not rconn.poll(timeout=60):
             raise AssertionError("Could not communicate with child process")
         parent_process_status = rconn.recv()
         self.assertEqual(parent_process_status, "alive")
@@ -309,7 +309,7 @@ class _TestProcess(BaseTestCase):
         p.terminate()
         p.join()
 
-        if not rconn.poll(timeout=5):
+        if not rconn.poll(timeout=60):
             raise AssertionError("Could not communicate with child process")
         parent_process_status = rconn.recv()
         self.assertEqual(parent_process_status, "not alive")
@@ -318,7 +318,7 @@ class _TestProcess(BaseTestCase):
     def _test_create_grandchild_process(cls, wconn):
         p = cls.Process(target=cls._test_report_parent_status, args=(wconn, ))
         p.start()
-        time.sleep(100)
+        time.sleep(300)
 
     @classmethod
     def _test_report_parent_status(cls, wconn):