def test_equality(self):
        self.assertTrue(self.first == self.first)
        self.assertTrue(self.first != self.second)
        self.assertFalse(self.first == self.second)
Check if a file exists in this instance of :class:`GridFS`.
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/trial/test/test_testcase.py/TestCaseMixin.test_equality--crossover with--dataset/ETHPy150Open blynch/CloudMemeBackend/gridfs/__init__.py/GridFS.exists