Revert the compare of protobuf message to comparing encoded result

src/python/grpcio_tests/tests/reflection/_reflection_servicer_test.py

@@ -50,6 +50,16 @@ def _file_descriptor_to_proto(descriptor):
 
 class ReflectionServicerTest(unittest.TestCase):
 
+    # NOTE(lidiz) Bazel + Python 3 will result in creating two different
+    # instance of DESCRIPTOR for each message. So, the equal comparision
+    # between protobuf returned by stub and manually crafted protobuf will
+    # always fail.
+    def _assert_sequence_of_proto_equal(self, x, y):
+        self.assertSequenceEqual(
+            list(map(lambda x: x.SerializeToString(), x)),
+            list(map(lambda x: x.SerializeToString(), y)),
+        )
+
     def setUp(self):
         self._server = test_common.test_server()
         reflection.enable_server_reflection(_SERVICE_NAMES, self._server)
@@ -84,7 +94,7 @@ class ReflectionServicerTest(unittest.TestCase):
                     error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
                 )),
         )
-        self.assertSequenceEqual(expected_responses, responses)
+        self._assert_sequence_of_proto_equal(expected_responses, responses)
 
     def testFileBySymbol(self):
         requests = (
@@ -108,7 +118,7 @@ class ReflectionServicerTest(unittest.TestCase):
                     error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
                 )),
         )
-        self.assertSequenceEqual(expected_responses, responses)
+        self._assert_sequence_of_proto_equal(expected_responses, responses)
 
     def testFileContainingExtension(self):
         requests = (
@@ -137,7 +147,7 @@ class ReflectionServicerTest(unittest.TestCase):
                     error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
                 )),
         )
-        self.assertSequenceEqual(expected_responses, responses)
+        self._assert_sequence_of_proto_equal(expected_responses, responses)
 
     def testExtensionNumbersOfType(self):
         requests = (
@@ -162,7 +172,7 @@ class ReflectionServicerTest(unittest.TestCase):
                     error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
                 )),
         )
-        self.assertSequenceEqual(expected_responses, responses)
+        self._assert_sequence_of_proto_equal(expected_responses, responses)
 
     def testListServices(self):
         requests = (reflection_pb2.ServerReflectionRequest(list_services='',),)
@@ -173,7 +183,7 @@ class ReflectionServicerTest(unittest.TestCase):
                 service=tuple(
                     reflection_pb2.ServiceResponse(name=name)
                     for name in _SERVICE_NAMES))),)
-        self.assertSequenceEqual(expected_responses, responses)
+        self._assert_sequence_of_proto_equal(expected_responses, responses)
 
     def testReflectionServiceName(self):
         self.assertEqual(reflection.SERVICE_NAME,