public void CompareTo_Can_Compare_With_Long()
        {
            var sut = new FileSize(5);

            sut.CompareTo(6).Should().Be(-1);
            sut.CompareTo(4).Should().Be(1);
        }
        public void CompareTo_Returns_1_When_Greater()
        {
            var sut = new FileSize(5);

            sut.CompareTo(new FileSize(4)).Should().Be(1);
        }
        public void CompareTo_Returns_Minus_1_When_Less()
        {
            var sut = new FileSize(5);

            sut.CompareTo(new FileSize(6)).Should().Be(-1);
        }
        public void CompareTo_Returns_0_When_Equal()
        {
            var sut = new FileSize(5);

            sut.CompareTo(new FileSize(5)).Should().Be(0);
        }