public void EqualsLine2doubleTrue()
    {
        var p1 = new Point2double(1, 2);
        var p2 = new Point2double(3, 4);
        var l1 = new Line2double(p1, p2);
        var l2 = new Line2double(p1, p2);

        Assert.True(l1.Equals(l2));
    }
    public void EqualsLine2doubleFalse()
    {
        var p1 = new Point2double(1, 2);
        var p2 = new Point2double(3, 4);
        var p3 = new Point2double(5, 5);
        var l1 = new Line2double(p1, p2);
        var l2 = new Line2double(p1, p3);

        Assert.False(l1.Equals(l2));
    }