public async void VerifyFixExpirationDate()
{
DateTime fixedExpiration = DateTime.UtcNow.AddDays(30);
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.FixExpirationDate(testBatch1.Id, fixedExpiration);
Assert.Equal(fixedExpiration, udpatedBatch.Expiration);
mockDataHandler.Verify(m => m.GetData <Batch>(DataSource.Batches), Times.Once);
mockDataHandler.Verify(m => m.WriteData(DataSource.Batches, It.IsAny <List <Batch> >()), Times.Once);
}