public void TestGetMinPayment()
{
//most straight foward example
var firstOfYear = new DateTime(DateTime.Today.Year, 1, 1);
var testSubject = new Rent(null, firstOfYear, 12, new Pecuniam(700), new Pecuniam(0));
//first rent due immediately
testSubject.PayRent(firstOfYear, new Pecuniam(-700));
//15 days later
var testResult = testSubject.GetMinPayment(firstOfYear.AddDays(15));
//paid first month so nothing should be due
Assert.AreEqual(0M, testResult.Amount);
//move signing back to mid Dec of prev year
var newSigningDate = new DateTime(DateTime.Today.Year - 1, 12, 14);
testSubject = new Rent(null, newSigningDate, 12, new Pecuniam(700), new Pecuniam(0));
//pro-rated amount should be due immediately
testResult = testSubject.GetMinPayment(newSigningDate);
Assert.AreEqual(new Pecuniam(-396.67M), testResult);
//should be the same until first of next month
testResult = testSubject.GetMinPayment(new DateTime(DateTime.Today.Year - 1, 12, 31));
Assert.AreEqual(new Pecuniam(-396.67M), testResult);
//first month rent due
testResult = testSubject.GetMinPayment(firstOfYear);
Assert.AreEqual(new Pecuniam(-396.67M + -700), testResult);
//pay prorated amt
testSubject.PayRent(new DateTime(DateTime.Today.Year - 1, 12, 31), new Pecuniam(-396.67M));
//should still be due one months
testResult = testSubject.GetMinPayment(firstOfYear);
Assert.AreEqual(new Pecuniam(-700), testResult);
//pay first month at exact same time only as another transaction
testSubject.PayRent(new DateTime(DateTime.Today.Year - 1, 12, 30), new Pecuniam(-700));
//since rent is not due until tommorrow - there is a 700 credit
testResult = testSubject.GetMinPayment(new DateTime(DateTime.Today.Year - 1, 12, 31));
Assert.AreEqual(700.0M, testResult.Amount);
//very next day should be current
testResult = testSubject.GetMinPayment(new DateTime(DateTime.Today.Year, 1, 1));
Assert.AreEqual(0M, testResult.Amount);
//pay some part of next month ahead of due
testSubject.PayRent(new DateTime(DateTime.Today.Year, 1, 18), new Pecuniam(-300));
//should register as a credit
testResult = testSubject.GetMinPayment(new DateTime(DateTime.Today.Year, 1, 18));
Assert.AreEqual(new Pecuniam(300), testResult);
//at first of next month rent less the credit should be due
testResult = testSubject.GetMinPayment(new DateTime(DateTime.Today.Year, 2, 1));
Assert.AreEqual(new Pecuniam(300 - 700), testResult);
}
