public async Task Add_InvalidObjectPassed_ReturnsBadRequest()
{
// Arrange
var biddingProperty = new BiddingProperty()
{
AskingPrice = 350000.00M
};
_controller.ModelState.AddModelError("Title", "Required");
// Act
var badResult = await _controller.Add(biddingProperty);
// Assert
Assert.IsInstanceOf <BadRequestObjectResult>(badResult);
}