diff --git a/graphene/core/types/tests/test_argument.py b/graphene/core/types/tests/test_argument.py
index ad7650b1..08a7718a 100644
--- a/graphene/core/types/tests/test_argument.py
+++ b/graphene/core/types/tests/test_argument.py
@@ -42,4 +42,4 @@ def test_to_arguments_wrong_type():
         to_arguments(
             p=3
         )
-    assert 'Unknown argument value type 3' == str(excinfo.value)
+    assert 'Unknown argument p=3' == str(excinfo.value)
diff --git a/graphene/core/types/tests/test_base.py b/graphene/core/types/tests/test_base.py
index c512e112..1ef17d6a 100644
--- a/graphene/core/types/tests/test_base.py
+++ b/graphene/core/types/tests/test_base.py
@@ -26,7 +26,7 @@ def test_type_as_field_called(Field):
     resolver = lambda x: x
     a = MountedType(2, description='A', resolver=resolver)
     a.as_field()
-    Field.assert_called_with(MountedType, 2, _creation_counter=a.creation_counter, description='A', resolver=resolver)
+    Field.assert_called_with(a, 2, _creation_counter=a.creation_counter, description='A', resolver=resolver)
 
 
 @patch('graphene.core.types.argument.Argument')