public async Task Remove_MultipleProducersRemoveSiteOfExport_ReturnsViewWithError()
        {
            A.CallTo(() => mediator.SendAsync(A <GetProducersByNotificationId> ._)).Returns(
                new List <ProducerData>
            {
                CreateProducer(producerId),
                CreateProducer(producerId2)
            });

            var result = await producerController.Remove(notificationId, producerId) as ViewResult;

            Assert.Equal(string.Empty, result.ViewName);
            Assert.NotNull(result.ViewBag.Error);
        }