[tests] include URL in failure report

test/test_results.py

@@ -417,6 +417,7 @@ def generate_tests():
         enum[name] += 1
 
         method = _generate_method(result)
+        method.__doc__ = result["#url"]
         method.__name__ = "test_{}_{}".format(name, enum[name])
         setattr(TestExtractorResults, method.__name__, method)