public void ItExpiresAtUTCMidnight()
{
//--arrange
var timeSpanUntilUTCMidnight = DateTime.UtcNow.Date.AddDays(1) - DateTime.UtcNow;
int numberOfSecondsUntilMidnight = (int)timeSpanUntilUTCMidnight.TotalSeconds;
//--act
var results = new DateUtilities().GetNumberOfSecondsUntilEndOfDay();
//--assert
var differenceBetweenExpectedAndActual = numberOfSecondsUntilMidnight - results;
Assert.That(differenceBetweenExpectedAndActual, Is.LessThan(10));
}