public async Task And_Invalid_StandardId_Then_Returns_Not_Found(
            string id,
            [Frozen] Mock <IMediator> mockMediator,
            [Greedy] TrainingCoursesController controller)
        {
            mockMediator
            .Setup(mediator => mediator.Send(
                       It.IsAny <GetStandardDetailsQuery>(),
                       It.IsAny <CancellationToken>()))
            .ReturnsAsync(new GetStandardDetailsResult(null));

            var controllerResult = await controller.GetStandardById(id) as NotFoundResult;

            controllerResult.StatusCode.Should().Be((int)HttpStatusCode.NotFound);
        }
        public async Task Then_Get_Training_Course_From_Mediator(
            string id,
            GetStandardDetailsResult mediatorResult,
            [Frozen] Mock <IMediator> mockMediator,
            [Greedy] TrainingCoursesController controller)
        {
            mockMediator
            .Setup(mediator => mediator.Send(
                       It.IsAny <GetStandardDetailsQuery>(),
                       It.IsAny <CancellationToken>()))
            .ReturnsAsync(mediatorResult);

            var controllerResult = await controller.GetStandardById(id) as ObjectResult;

            Assert.IsNotNull(controllerResult);
            controllerResult.StatusCode.Should().Be((int)HttpStatusCode.OK);
            var model = controllerResult.Value as GetStandardDetailsResponse;

            Assert.IsNotNull(model);
            model.Should().BeEquivalentTo(mediatorResult.StandardDetails);
        }