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How to test logic which is dependent on current date

Asked 2010-02-17T20:49:10.130
10

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 Thur, Fri or Sat then it gives 6 days of lead time to account for the weekend. 

private DateTime GetEstimatedArrivalDate()
{
    DateTime estimatedDate; 
    if (DateTime.Now.DayOfWeek >= DayOfWeek.Thursday)
    {
        estimatedDate = DateTime.Now.Date.AddDays(6);
    }
    else
    {
        estimatedDate = DateTime.Now.Date.AddDays(5);
    }
    return estimatedDate; 
}

The actual estimation logic is more complex. I have simplified it for the purpose of this question. My question is how do I write a unit test for something like this which depends on todays date?

c# unit-testing
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1 Answer

1

I would suggest doing this as Mark suggests, but with the addition of a overloaded call for production use that takes no parameter and uses DateTime.Now

private DateTime GetEstimatedArrivalDate()
{
    return GetEstimatedArrivalDate(DateTime.Now);
}

private DateTime GetEstimatedArrivalDate(DateTime currentDate)
{
    DateTime estimatedDate; 
    if (currentDate.DayOfWeek >= DayOfWeek.Thursday)
    {
        estimatedDate = currentDate.AddDays(6);
    }
    else
    {
        estimatedDate = currentDate.AddDays(5);
    }
    return estimatedDate; 
}
answered 2010-02-17T21:29:21.253

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