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+import unittest%0Aimport mock%0A%0Afrom generators.city_visitor import CityVisitor%0A%0A%0Aclass CityVisitorTest(unittest.TestCase):%0A%0A    def test_city_visitor(self):%0A        city = mock.Mock()%0A        visitor = CityVisitor(city)%0A        visitor.run()%0A        city.accept.assert_called()%0A

Add test for city visitor.