public void Line_IsParallelTo()
        {
            Line line1 = new LineSegment(Point.MakePointWithInches(0,0), Point.MakePointWithInches(5,0));
            Line line2 = new LineSegment(Point.MakePointWithInches(-3,-3), Point.MakePointWithInches(8,-3));
            Line line3 = new LineSegment(Point.MakePointWithInches(1, 1), Point.MakePointWithInches(4, 1));

            Line line4 = new LineSegment(Point.MakePointWithInches(0, 0), Point.MakePointWithInches(0, 5));
            Line line5 = new LineSegment(Point.MakePointWithInches(-3, -3), Point.MakePointWithInches(-3, 8));
            Line line6 = new LineSegment(Point.MakePointWithInches(1, 1), Point.MakePointWithInches(1,4));
             
            line1.IsParallelTo(line2).Should().BeTrue();
            line2.IsParallelTo(line3).Should().BeTrue();

            line4.IsParallelTo(line5).Should().BeTrue();
            line5.IsParallelTo(line6).Should().BeTrue();

            line1.IsParallelTo(line4).Should().BeFalse();
            line5.IsParallelTo(line3).Should().BeFalse();
        }