call site 6 for test.collect.Directory.__init__
test/testing/test_collect.py - line 46
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   def test_found_certain_testfiles(): 
       tmp = py.test.ensuretemp("found_certain_testfiles")
       tmp.ensure('test_found.py')
       tmp.ensure('found_test.py')
   
->     colitem = py.test.collect.Directory(tmp) 
       items = list(colitem._tryiter(py.test.collect.Module))
       assert len(items) == 2
       items = [item.name for item in items]
       assert 'test_found.py' in items
       assert 'found_test.py' in items