def test_cleanup(self):
        hook = self.environment._hookmanager.hooks[0]
        self.environment.deallocate()
        self.assertTrue(hook.clean)
Return the first child found with tag in *tagnames*, or None if
dataset/ETHPy150Open F-Secure/see/see/test/environment_test.py/EnvironmentTest.test_cleanup--crossover with--dataset/ETHPy150Open python-openxml/python-docx/docx/oxml/xmlchemy.py/_OxmlElementBase.first_child_found_in