private void should_return_time_since_if_datetime_has_been_set(DateTimeKeeper dateTimeKeeper)
{
// given
// when
dateTimeKeeper.SetDateTimeToNow();
// then
dateTimeKeeper.HasDateTime().ShouldBeTrue();
Thread.Sleep(TimeSpan.FromMilliseconds(200));
dateTimeKeeper.TimeSinceDateTime().ShouldBeGreaterThan(TimeSpan.FromMilliseconds(100));
dateTimeKeeper.TimeSinceDateTime().ShouldBeLessThan(TimeSpan.FromMilliseconds(600));
}
private void should_throw_exception_if_get_time_is_called_before_being_set(DateTimeKeeper dateTimeKeeper)
{
Assert.Throws <DateTimeKeeper.DateTimeNotSetException>(() => dateTimeKeeper.TimeSinceDateTime());
dateTimeKeeper.HasDateTime().ShouldBeFalse();
}