public async Task DeleteListener(Boolean mediatorResult) { Random random = new Random(); Guid pipelineId = random.NextGuid(); Mock <IMediator> mediatorMock = new Mock <IMediator>(MockBehavior.Strict); mediatorMock.Setup(x => x.Send(It.Is <DeleteNotificationPipelineCommand>(y => y.PipelineId == pipelineId ), It.IsAny <CancellationToken>())).ReturnsAsync(mediatorResult).Verifiable(); var controller = new NotificationsController( Mock.Of <INotificationEngine>(MockBehavior.Strict), mediatorMock.Object, Mock.Of <ILogger <NotificationsController> >()); var actionResult = await controller.DeletePipeline(pipelineId); if (mediatorResult == true) { actionResult.EnsureNoContentResult(); } else { actionResult.EnsureBadRequestObjectResult("unable to delete the pipeline"); } mediatorMock.Verify(); }