public void ContainsFlagEnumTest() { var week = WeekEnum.Monday; FlagEnums.Contains(week, WeekEnum.Monday).ShouldBeTrue(); FlagEnums.Contains(week, WeekEnum.Tuesday).ShouldBeFalse(); FlagEnums.Add(ref week, WeekEnum.Tuesday, WeekEnum.Wednesday); FlagEnums.Contains(week, WeekEnum.Monday).ShouldBeTrue(); FlagEnums.Contains(week, WeekEnum.Tuesday).ShouldBeTrue(); }