call site 12 for test.config.initsession
test/testing/test_config.py - line 262
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   def test_boxed_option_from_conftest(self):
       self.tmpdir.join("conftest.py").write("dist_hosts=[]")
       tmpdir = self.tmpdir.ensure("subdir", dir=1)
       tmpdir.join("conftest.py").write(py.code.Source("""
               dist_hosts = []
               dist_boxed = True
           """))
       config = py.test.config._reparse(['--dist', tmpdir])
->     config.initsession()
       assert config.option.boxed