public void CurrentEndOfYearShouldReturnExpectedResult() { using ( ShimsContext.Create() ) { ShimDateTime.TodayGet = () => new DateTime( 2013, 6, 1 ); var expected = new DateTime( 2013, 12, 31 ); var target = new GregorianCalendar(); var actual = target.CurrentEndOfYear(); Assert.Equal( expected.Date, actual.Date ); } }