Skip tests properly (#31308)

* Skip tests properly

* [test_all]

* Add 'reason' as kwarg for skipTest

* [test_all] Fix up

* [test_all]

tests/models/codegen/test_tokenization_codegen.py

@@ -99,7 +99,7 @@ class CodeGenTokenizationTest(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(add_prefix_space=True)
@@ -127,6 +127,7 @@ class CodeGenTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         input_bpe_tokens = [14, 15, 10, 9, 3, 2, 15, 19]
         self.assertListEqual(rust_tokenizer.convert_tokens_to_ids(input_tokens), input_bpe_tokens)
 
+    @unittest.skip
     def test_pretokenized_inputs(self, *args, **kwargs):
         # It's very difficult to mix/test pretokenization with byte-level
         # And get both CodeGen and Roberta to work at the same time (mostly an issue of adding a space before the string)
@@ -262,6 +263,7 @@ class CodeGenTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         # TODO @ArthurZ outputs of the fast tokenizer are different in this case, un-related to the PR
 
     # tokenizer has no padding token
+    @unittest.skip(reason="tokenizer has no padding token")
     def test_padding_different_model_input_name(self):
         pass