updated test to match outputs

tests/test_error.py

@@ -20,7 +20,7 @@ def test_bad_request_without_message(app):
     with app.app_context():
         response = bad_request(status_code=400)
         assert response.status_code == 400
-        assert response.json == {'error': 'Bad Request'}
+        assert response.json == {'error': 'Bad Request', 'message': 'An error occurred'}
 
 
 def test_response_error_with_message(app):
@@ -34,4 +34,4 @@ def test_response_error_without_message(app):
     with app.app_context():
         response = response_error(code_status=500)
         assert response.status_code == 500
-        assert response.json == {'error': 'Internal Server Error'}
+        assert response.json == {'error': 'Internal Server Error' , 'message': 'An error occurred'}