public void WhenCityDataValid_IfCityAlreadyAdded_ReturnsBadRequest() { // Arrange CityDTO cityDTO = new CityDTO() { CityName = "Chennai" }; // Act var ex = _movieService.AddCity(cityDTO); // Assert Assert.AreEqual($"City with the name {cityDTO.CityName} already added.", ex.Exception.InnerException.Message); }