Skip tests properly (#31308)

* Skip tests properly

* [test_all]

* Add 'reason' as kwarg for skipTest

* [test_all] Fix up

* [test_all]

tests/models/xlm_roberta/test_tokenization_xlm_roberta.py

@@ -143,7 +143,7 @@ class XLMRobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_save_pretrained(self):
         if not self.test_slow_tokenizer:
             # as we don't have a slow version, we can't compare the outputs between slow and fast versions
-            return
+            self.skipTest(reason="test_slow_tokenizer is set to False")
 
         self.tokenizers_list[0] = (self.rust_tokenizer_class, "hf-internal-testing/tiny-xlm-roberta", {})
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
@@ -224,7 +224,7 @@ class XLMRobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
     def test_rust_and_python_full_tokenizers(self):
         if not self.test_rust_tokenizer:
-            return
+            self.skipTest(reason="test_rust_tokenizer is set to False")
 
         tokenizer = self.get_tokenizer()
         rust_tokenizer = self.get_rust_tokenizer()