public async Task CreateDiscountReturnValidDiscount()
{
//Arrange
var expectedCoupon = this.DesiredDiscount;
_mockDiscountRepository.Setup(x => x.CreateDiscount(It.IsAny <Coupon>())).ReturnsAsync(true);
//Act
var result = await _sut.CreateDiscount(expectedCoupon);
//Assert
Assert.NotNull(result);
var response = Assert.IsType <ActionResult <Coupon> >(result);
var createResult = response.Result as CreatedAtRouteResult;
Assert.Equal(201, createResult.StatusCode.Value);
var returnedCoupon = Assert.IsType <Coupon>(createResult.Value);
Assert.Equal(expectedCoupon.ProductName, returnedCoupon.ProductName);
}