1 files changed, 4 insertions, 0 deletions
diff --git a/tests/oauth2/rfc6749/test_parameters.py b/tests/oauth2/rfc6749/test_parameters.py
index b211d1e..c42f516 100644
--- a/tests/oauth2/rfc6749/test_parameters.py
+++ b/tests/oauth2/rfc6749/test_parameters.py
@@ -103,6 +103,7 @@ class ParameterTests(TestCase):
                      '  "refresh_token": "tGzv3JOkF0XG5Qx2TlKWIA",'
                      '  "example_parameter": "example_value" }')
 
+    json_custom_error = '{ "error": "incorrect_client_credentials" }'
     json_error = '{ "error": "access_denied" }'
 
     json_notoken = ('{ "token_type": "example",'
@@ -197,6 +198,9 @@ class ParameterTests(TestCase):
         self.assertRaises(ValueError, parse_implicit_response,
                 self.implicit_wrongstate, state=self.state)
 
+    def test_custom_json_error(self):
+        self.assertRaises(CustomOAuth2Error, parse_token_response, self.json_custom_error)
+
     def test_json_token_response(self):
         """Verify correct parameter parsing and validation for token responses. """
         self.assertEqual(parse_token_response(self.json_response), self.json_dict)