diff --git a/test/refactor.py b/test/refactor.py
index d9b5bc7f..7598bc7d 100644
--- a/test/refactor.py
+++ b/test/refactor.py
@@ -82,7 +82,7 @@ def _collect_file_tests(code, path, lines_to_execute):
 
         yield RefactoringCase(name, first, line_nr, index, path, kwargs, type_, second)
     if match is None:
-        raise Exception(f"Didn't match any test for {path}")
+        raise Exception(f"Didn't match any test for {path}, {code!r}")
     if match.end() != len(code):
         raise Exception(f"Didn't match until the end of the file in {path}")