public void Distance_ToString_NumberOfDecimals()
        {
            // arrange
            Distance Distance = new Distance(new Millimeter(), 14.1875);
            Distance Distance2 = new Distance(new Millimeter(), 0.0001);
            Distance Distance3 = new Distance(new Millimeter(), 1.13);
            //should come back rounded due
            // act

            // assert
            Distance.ToString(3).Should().Be("14.188 mm");
            Distance2.ToString(1).Should().Be("0 mm");
            Distance3.ToString(0).Should().Be("1 mm");
        }
        public void Distance_ToString()
        {
            // arrange
            Distance Distance = new Distance(new Millimeter(), 14.1875);
            Distance Distance2 = new Distance(new Millimeter(), 0);
            Distance Distance3 = new Distance(new Millimeter(), 1.13);
            //should come back rounded due
            // act

            // assert
            Distance.ToString().Should().Be("14 mm");
            Distance2.ToString().Should().Be("0 mm");
            Distance3.ToString().Should().Be("1 mm");
        }