def METHOD_NAME(self):
    if not PY2:
        with mock.patch.dict(os.environ, {"KRB5CCNAME": self.cache_v4_file}):
            domain, username, TGT, TGS = CCache.parseFile("")
            self.assertEqual(domain, self.domain)
            self.assertEqual(username, self.username)
            self.assertIsNone(TGS)
            self.assertIsNotNone(TGT)
            domain, username, TGT, TGS = CCache.parseFile("unexistent_domain")
            self.assertIsNone(TGS)
            self.assertIsNone(TGT)
            domain, username, TGT, TGS = CCache.parseFile(self.domain)
            self.assertEqual(domain, self.domain)
            self.assertEqual(username, self.username)
            self.assertIsNone(TGS)
            self.assertIsNotNone(TGT)
            domain, username, TGT, TGS = CCache.parseFile(self.domain, self.username)
            self.assertEqual(domain, self.domain)
            self.assertEqual(username, self.username)
            self.assertIsNone(TGS)
            self.assertIsNotNone(TGT)