public void UpdateExpiryDateWithoutChangeStateTest()
{
BillInfo bill = billDefaults.returnBillInfoDefaults();
var expiryDate = DateTime.Today;
bill.UpdateExpiryDateWithoutChangeState(expiryDate.Date);
bill.ShouldNotBeNull();
bill.AmountDue.ShouldBe(billDefaults._amountDue);
bill.DueDate.ShouldBe(billDefaults._dueDt);
bill.AgencyCode.ShouldBe(billDefaults._agencyCode);
bill.CreatedAt.Date.ShouldBe(DateTime.Now.Date);
bill.IsActive.ShouldBe(true);
bill.State.ShouldBe(ObjectState.Added);
bill.ActionStatus.ShouldBeNull();
bill.ExpiryDate.Date.ShouldBe(expiryDate.Date);
}