Fix broken unittest

Author: asvetlov

aiohttp/connector.py

@@ -287,7 +287,7 @@ def __init__(self, proxy, *args, proxy_auth=None, **kwargs):
             "Only http proxy supported", proxy)
         assert (proxy_auth is None
                 or isinstance(proxy_auth, (BasicAuth, BasicAuthEx))), \
-            ("proxy_auth must be None, BasicAuth() or BasicAuthEx() tuple",
+            ("proxy_auth must be None, BasicAuth() or BasicAuthEx()",
              proxy_auth)
 
     @property

tests/test_connector.py

@@ -352,12 +352,14 @@ def test_connect(self, ClientRequestMock):
             loop=loop_mock)
 
     def test_proxy_auth(self):
-        with self.assertRaisesRegex(AssertionError,
-                                    "must be None, BasicAuth() "
-                                    "or BasicAuthEx()"):
+        with self.assertRaises(AssertionError) as ctx:
             aiohttp.ProxyConnector('http://proxy.example.com',
                                    proxy_auth=('user', 'pass'),
                                    loop=unittest.mock.Mock())
+        self.assertEqual(ctx.exception.args[0],
+                         ("proxy_auth must be None, BasicAuth() "
+                          "or BasicAuthEx()", ('user', 'pass')))
+
 
     @unittest.mock.patch('aiohttp.connector.ClientRequest')
     def test_proxy_override_auth(self, ClientRequestMock):