What is actual if not what was expected?

Author: jaraco

Lib/test/test_importlib/test_files.py

@@ -11,7 +11,7 @@ class FilesTests:
     def test_read_bytes(self):
         files = resources.files(self.data)
         actual = files.joinpath('utf-8.file').read_bytes()
-        assert actual == b'Hello, UTF-8 world!\n'
+        assert actual == b'Hello, UTF-8 world!\n', repr(actual)
 
     def test_read_text(self):
         files = resources.files(self.data)