public async Task GetMembers_ReturnsOkObjectResult()
{
// Arrange
int id = 2;
_regionService.Setup(x => x.GetMembersAsync(It.IsAny <int>())).ReturnsAsync(new List <CityDTO>());
// Act
var result = await _regionController.GetMembers(id);
var actual = (result as ObjectResult).Value;
// Assert
Assert.IsInstanceOf <OkObjectResult>(result);
Assert.IsInstanceOf <IEnumerable <CityDTO> >(actual);
}