public async Task CalculateTotal_ShouldInvokeCalculateQuery()
{
//Arrange
var query = new GetTrolleyTotalQuery(new TrolleyDto());
_mediator
.Setup(m => m.Send(It.IsAny <GetTrolleyTotalQuery>(), default(CancellationToken))).ReturnsAsync(100);
var mediatorObject = _mediator.Object;
var controller = new CartController(mediatorObject);
var trolley = GetSampleTrolly();
//Act
var total = await controller.CalculateTotal(trolley);
//Assert
total.Should().Be(100);
_mediator.Verify(
i => i.Send(It.Is <GetTrolleyTotalQuery>(args =>
args.Trolley.Products.Count() == trolley.Products.Count() &&
args.Trolley.Quantities.Count() == trolley.Quantities.Count() &&
args.Trolley.Specials.Count() == trolley.Specials.Count())
, It.IsAny <CancellationToken>()), Times.Once, "Should Send Get Trolley Total Query to Mediator");
}