Identify sub-tests

tetras_extraction/macao_12/script/src/test.py

@@ -15,10 +15,10 @@ class CompareFiles(unittest.TestCase):
     def runTest(self) -> None:
         for file in TESTS_DIR.rglob("*"):  # Recursively find all files
             if file.is_file():
-                with self.subTest():
+                relative = file.relative_to(TESTS_DIR)
+                with self.subTest(msg=relative):
                     # ex: for a file `TESTS_DIR/pg60/index.md`, will find the first file in
                     # `RESULT_DIR` whose path ends with `pg60/index.md`
-                    relative = file.relative_to(TESTS_DIR)
                     cmd = subprocess.run(
                         [
                             "find",