use unittest.skip; thanks to Chang Min Jeon from docs@
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index bdf07a4..b130a8b 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -640,7 +640,7 @@
 
 Classes can be skipped just like methods: ::
 
-   @skip("showing class skipping")
+   @unittest.skip("showing class skipping")
    class MySkippedTestCase(unittest.TestCase):
        def test_not_run(self):
            pass