public async void VerifyFixQuantities()
{
int updatedSize = 1444;
int updatedAvailableQuantity = 1111;
mockDataHandler.Setup(m => m.GetData <Batch>(DataSource.Batches))
.ReturnsAsync(batchList);
mockDataHandler.Setup(
m => m.WriteData(DataSource.Batches, It.IsAny <List <Batch> >())
).Returns(Task.CompletedTask);
Batch udpatedBatch = await dataAccess.FixQuantities(testBatch1.Id, updatedSize, updatedAvailableQuantity);
Assert.Equal(updatedSize, udpatedBatch.BatchSize);
Assert.Equal(updatedAvailableQuantity, udpatedBatch.AvailableQuantity);
mockDataHandler.Verify(m => m.GetData <Batch>(DataSource.Batches), Times.Once);
mockDataHandler.Verify(m => m.WriteData(DataSource.Batches, It.IsAny <List <Batch> >()), Times.Once);
}