def test_exists(self):
        for v in Version.select(self.env):
            self.assertEqual(v.exists, True)
Network is destroyed on delete().
dataset/ETHPy150Open edgewall/trac/trac/ticket/tests/model.py/VersionTestCase.test_exists--crossover with--dataset/ETHPy150Open F-Secure/see/see/context/resources/test/network_test.py/CreateTest.test_delete