call site 7 for test.collect.Module.listnames
test/testing/test_collect.py - line 30
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   def test_collect_listnames_and_back():
       col1 = py.test.collect.Directory(datadir.dirpath())
       col2 = col1.join(datadir.basename) 
       col3 = col2.join('filetest.py')
       l = col3.listnames()
       assert len(l) == 3
       x = col1._getitembynames(l[1:])
       assert x.name == "filetest.py"
       x = col1._getitembynames("/".join(l[1:]))
       assert x.name == "filetest.py"
->     l2 = x.listnames()
       assert len(l2) == 3