Skip tests properly (#31308)

* Skip tests properly

* [test_all]

* Add 'reason' as kwarg for skipTest

* [test_all] Fix up

* [test_all]

tests/models/mbart/test_modeling_mbart.py

@@ -496,7 +496,7 @@ class MBartCC25IntegrationTest(AbstractSeq2SeqIntegrationTest):
     ]
     tgt_text = ["Şeful ONU declară că nu există o soluţie militară în Siria", "to be padded"]
 
-    @unittest.skip("This test is broken, still generates english")
+    @unittest.skip(reason="This test is broken, still generates english")
     def test_cc25_generate(self):
         inputs = self.tokenizer([self.src_text[0]], return_tensors="pt").to(torch_device)
         translated_tokens = self.model.generate(
@@ -731,6 +731,6 @@ class MBartStandaloneDecoderModelTest(ModelTesterMixin, GenerationTesterMixin, u
         config_and_inputs = self.model_tester.prepare_config_and_inputs()
         self.model_tester.create_and_check_decoder_model_attention_mask_past(*config_and_inputs)
 
+    @unittest.skip(reason="Decoder cannot retain gradients")
     def test_retain_grad_hidden_states_attentions(self):
-        # decoder cannot keep gradients
         return

tests/models/mbart/test_tokenization_mbart.py

@@ -134,7 +134,7 @@ class MBartTokenizationTest(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-random-mbart", {})
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
@@ -202,7 +202,7 @@ class MBartTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
                 shutil.rmtree(tmpdirname2)
 
-    @unittest.skip("Need to fix this after #26538")
+    @unittest.skip(reason="Need to fix this after #26538")
     def test_training_new_tokenizer(self):
         pass