public async Task AddFollower_ReturnsOkResult()
{
// Arrange
int id = 2;
int idCity = 2;
_regionService.Setup(x => x.AddFollowerAsync(It.IsAny <int>(), It.IsAny <int>()));
// Act
var result = await _regionController.AddFollower(id, idCity);
// Assert
Assert.IsInstanceOf <OkResult>(result);
}