call site 20 for test.collect.Class.run
test/testing/test_collect.py - line 98
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   def test_disabled_class():
       col = py.test.collect.Module(datadir.join('disabled.py'))
       l = col.run() 
       assert len(l) == 1
       colitem = col.join(l[0])
       assert isinstance(colitem, py.test.collect.Class)
->     assert not colitem.run()