public void GetPreviousMonthReading_GiveTenantIdMonth_GetPreviousReading()
{
//Arrange
var tenantid = 1;
var previousMonthReading = 40;
var time = new DateTime(2020, 3, 7);
var previousMonth = time.Month - 2;
_billUnitOfWorkMock.Setup(x => x.ReadingRepository).Returns(_readingRepositoryMock.Object);
// _readingRepositoryMock.Setup(x => x.GetPreviousMonthReading(tenantid, previousMonth)).Returns(previousMonthReading);
// Act
_readingService.GetPreviousMonthReading(tenantid, time);
//Assert
_billRepositoryMock.VerifyAll();
_readingRepositoryMock.VerifyAll();
_billUnitOfWorkMock.VerifyAll();
}