Fixed mistake in test for f-string error description (GH-22036) (GH-22059)

Author: millefalcon

Lib/test/test_format.py

@@ -514,7 +514,7 @@ def test_with_a_commas_and_an_underscore_in_format_specifier(self):
     def test_with_an_underscore_and_a_comma_in_format_specifier(self):
         error_msg = re.escape("Cannot specify both ',' and '_'.")
         with self.assertRaisesRegex(ValueError, error_msg):
-            '{:,_}'.format(1)
+            '{:_,}'.format(1)
 
 if __name__ == "__main__":
     unittest.main()

Lib/test/test_fstring.py

@@ -1217,7 +1217,7 @@ def test_with_a_commas_and_an_underscore_in_format_specifier(self):
     def test_with_an_underscore_and_a_comma_in_format_specifier(self):
         error_msg = re.escape("Cannot specify both ',' and '_'.")
         with self.assertRaisesRegex(ValueError, error_msg):
-            f'{1:,_}'
+            f'{1:_,}'
 
 if __name__ == '__main__':
     unittest.main()