public async Task And_Exception_Then_Returns_Bad_Request(
            [Frozen] Mock <IMediator> mockMediator,
            [Greedy] ProvidersController controller)
        {
            mockMediator
            .Setup(mediator => mediator.Send(
                       It.IsAny <GetProvidersQuery>(),
                       It.IsAny <CancellationToken>()))
            .Throws <InvalidOperationException>();

            var controllerResult = await controller.GetAllProviders() as BadRequestResult;

            controllerResult.StatusCode.Should().Be((int)HttpStatusCode.BadRequest);
        }
        public async Task Then_Gets_Providers_From_Mediator(
            GetProvidersQueryResult mediatorResult,
            [Frozen] Mock <IMediator> mockMediator,
            [Greedy] ProvidersController controller)
        {
            mockMediator
            .Setup(mediator => mediator.Send(
                       It.IsAny <GetProvidersQuery>(),
                       It.IsAny <CancellationToken>()))
            .ReturnsAsync(mediatorResult);

            var controllerResult = await controller.GetAllProviders() as ObjectResult;

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

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