Issue #10161: test_pep277 formats filenames with ascii() on error
As suggested by Antoine, it's better to patch only test_pep277 than the
unittest module.
diff --git a/Lib/test/test_pep277.py b/Lib/test/test_pep277.py
index 862cdbb..a7e2f00 100644
--- a/Lib/test/test_pep277.py
+++ b/Lib/test/test_pep277.py
@@ -154,7 +154,7 @@
sf0 = set(normalize('NFD', f) for f in self.files)
f2 = [normalize('NFD', f) for f in f2]
sf2 = set(os.path.join(support.TESTFN, f) for f in f2)
- self.assertEqual(sf0, sf2)
+ self.assertEqual(sf0, sf2, "%a != %a" % (sf0, sf2))
self.assertEqual(len(f1), len(f2))
def test_rename(self):