call site 0 for test.config.initsession
test/testing/test_config.py - line 272
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   def test_boxed_option_from_conftest2(self):
       tmpdir = self.tmpdir
       tmpdir.join("conftest.py").write(py.code.Source("""
               dist_boxed = False
           """))
       config = py.test.config._reparse([tmpdir, '--box'])
       assert config.option.boxed 
->     config.initsession()
       assert config.option.boxed