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);
}
