public void TestIsAtLeastANullableDayBefore() {
DateTime? wellKnownDay = new DateTime(2002, 4, 4);
Enumerable.Range(-10, 9).
Select(x => wellKnownDay.Value.AddDays(x)).
Select(x => new DateTime?(x)).ToList().
ForEach(x => Assert.IsFalse(wellKnownDay.IsAtLeastOneDayBefore(x)));
Enumerable.Range(1, 9).
Select(x => wellKnownDay.Value.AddDays(x)).
Select(x => new DateTime?(x)).ToList().
ForEach(x => Assert.IsTrue(wellKnownDay.IsAtLeastOneDayBefore(x)));
Assert.IsFalse(((DateTime?) wellKnownDay).IsAtLeastOneDayBefore(wellKnownDay));
Assert.IsFalse(((DateTime?) null).IsAtLeastOneDayBefore(wellKnownDay));
Assert.IsFalse(((DateTime?) null).IsAtLeastOneDayBefore(null));
Assert.IsFalse(wellKnownDay.IsAtLeastOneDayBefore(null));
}
public string ValidateListPurchaseOrders(Vendor vendor, DateTime? fromDate, DateTime? toDate)
{
return toDate.IsAtLeastOneDayBefore(fromDate) ? "To Date cannot be before From Date" : null;
}
public void TestIsAtLeastOneDayBefore() {
var wellKnownDay = new DateTime(2002, 4, 4);
var nextDay = wellKnownDay.AddDays(1);
//Simple test
Assert.IsFalse(nextDay.IsAtLeastOneDayBefore(wellKnownDay));
Assert.IsTrue(wellKnownDay.IsAtLeastOneDayBefore(nextDay));
Enumerable.Range(-10, 9).
Select(x => wellKnownDay.AddDays(x)).ToList().
ForEach(x => Assert.IsFalse(wellKnownDay.IsAtLeastOneDayBefore(x)));
Enumerable.Range(1, 9).
Select(x => wellKnownDay.AddDays(x)).ToList().
ForEach(x => Assert.IsTrue(wellKnownDay.IsAtLeastOneDayBefore(x)));
Assert.IsFalse(wellKnownDay.IsAtLeastOneDayBefore(null));
Assert.IsFalse(wellKnownDay.IsAtLeastOneDayBefore(wellKnownDay));
}
