public void TestSalesReceiptTransaction()
{
int empId = 6;
AddCommissionEmployee t = new AddCommissionEmployee(empId, "Kubing", "Home", 2000, 3.0, database);
t.Execute();
var saleDay = new DateTime(2017, 3, 19);
SalesReceiptTransaction srt = new SalesReceiptTransaction(saleDay, 4, empId, database);
srt.Execute();
Employee e = database.GetEmployee(empId);
Assert.IsNotNull(e);
PaymentClassification pc = e.Classification;
Assert.IsTrue(pc is CommissionedClassification);
CommissionedClassification hc = pc as CommissionedClassification;
var salesReceipts = database.GetSalesReceipts(empId).ToList();
var sr = salesReceipts.FirstOrDefault(x => x.Date == saleDay);
Assert.IsNotNull(sr);
Assert.AreEqual(4, sr.Amount);
}