public void NameNotEmptyTest() { CityViewModel cityViewModel = new CityViewModel(); cityViewModel.NameCity = "Moscow"; bool notEmpty = cityViewModel.NameNotEmpty(cityViewModel.NameCity); cityViewModel.NameCity = null; bool nullString = !cityViewModel.NameNotEmpty(cityViewModel.NameCity); cityViewModel.NameCity = ""; bool empty = !cityViewModel.NameNotEmpty(cityViewModel.NameCity); City.AllCities.Clear(); Assert.IsTrue(notEmpty && nullString && empty); }