diff --git a/tests/test_postgresql.py b/tests/test_postgresql.py
index 0ed04a15..92f32a02 100644
--- a/tests/test_postgresql.py
+++ b/tests/test_postgresql.py
@@ -263,9 +263,13 @@ class TestPostgresql(unittest.TestCase):
         self.assertTrue(self.p.can_rewind)
         self.p.controldata = tmp
 
+    @patch('time.sleep', Mock())
     def test_create_replica(self):
         self.p.delete_trigger_file = Mock(side_effect=OSError())
-        self.assertEquals(self.p.create_replica({'host': '', 'port': '', 'user': ''}, ''), 1)
+        with patch('subprocess.call', Mock(side_effect=[1, 0])):
+            self.assertEquals(self.p.create_replica({'host': '', 'port': '', 'user': ''}, ''), 0)
+        with patch('subprocess.call', Mock(side_effect=[Exception(), 0])):
+            self.assertEquals(self.p.create_replica({'host': '', 'port': '', 'user': ''}, ''), 0)
 
     def test_create_connection_users(self):
         cfg = self.p.config