Skip tests properly (#31308)

* Skip tests properly

* [test_all]

* Add 'reason' as kwarg for skipTest

* [test_all] Fix up

* [test_all]

tests/utils/test_model_output.py

@@ -159,11 +159,11 @@ class ModelOutputTester(unittest.TestCase):
             )
 
     # TODO: @ydshieh
-    @unittest.skip("CPU OOM")
+    @unittest.skip(reason="CPU OOM")
     @require_torch
     def test_export_serialization(self):
         if not is_torch_greater_or_equal_than_2_2:
-            return
+            self.skipTest(reason="Export serialization requires torch >= 2.2.0")
 
         model_cls = AlbertForMaskedLM
         model_config = model_cls.config_class()