Skip tests properly (#31308)

* Skip tests properly

* [test_all]

* Add 'reason' as kwarg for skipTest

* [test_all] Fix up

* [test_all]

tests/models/layoutlm/test_tokenization_layoutlm.py

@@ -69,6 +69,7 @@ class LayoutLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         self.assertListEqual(tokens, ["un", "##want", "##ed", ",", "runn", "##ing"])
         self.assertListEqual(tokenizer.convert_tokens_to_ids(tokens), [7, 4, 5, 10, 8, 9])
 
+    @unittest.skip
     def test_special_tokens_as_you_expect(self):
         """If you are training a seq2seq model that expects a decoder_prefix token make sure it is prepended to decoder_input_ids"""
         pass