def setUp(self):
        db.setup({'sqlalchemy.url': 'sqlite:///:memory:'})
get last traversed text. used in webview for highlighted text.
dataset/ETHPy150Open eoyilmaz/anima/tests/env/test_environmentBase.py/EnvironmentBaseTestCase.setUp--crossover with--dataset/ETHPy150Open xiaocong/uiautomator/uiautomator/__init__.py/AutomatorDevice.last_traversed_text