Swap argument order in assert

Author: tomasr8

Lib/test/test_tools/test_msgfmt.py

@@ -37,7 +37,7 @@ def test_compilation(self):
                     with open(tmp_mo_file, 'rb') as f:
                         actual = GNUTranslations(f)
 
-                    self.assertDictEqual(expected._catalog, actual._catalog)
+                    self.assertDictEqual(actual._catalog, expected._catalog)
 
     def test_invalid_msgid_plural(self):
         with temp_cwd():