public void when_timespan_is_greater_then_range_maximum_validation_fails()
        {
            //given
            var sut = new TimeSpanRangedWithStrings
            {
                TimeSpan = TimeSpan.FromHours(13)
            };

            //then
            Validate(sut).Should().Throw <ValidationException>();
        }
        public void when_timespan_is_within_the_range_validation_passes()
        {
            //given
            var sut = new TimeSpanRangedWithStrings
            {
                TimeSpan = TimeSpan.FromHours(11)
            };

            //then
            Validate(sut).Should().NotThrow <ValidationException>();
        }
        public void when_timespan_is_less_then_range_minimum_validation_fails()
        {
            //given
            var sut = new TimeSpanRangedWithStrings
            {
                TimeSpan = TimeSpan.Zero
            };

            //then
            Validate(sut).Should().Throw <ValidationException>();
        }