How to test logic which is dependent on current date

Question

I have this method which is dependent on current date. It checks if today is Sun, Mon, Tue or Wed, then it gives 5 days of lead time for arrival of shipped items. If its Thu

Answer 1

You could pass in a delegate that returns DateTime.Now during normal execution, and then in your test pass in another delegate that returns a fixed date, and assert your result based on that.