@testset "points" begin
    @testset "order" begin
        p1 = Point2D(1.0, 2.0)
        p2 = Point2D(1.1, 2.1)
        p3 = Point2D(1.1, 2.2)

        @test p1 < p2
    end

    # @testset "conversion" begin
    #     point = [1.0 ; 2.0]
    #     p = convert(Point2D, point)
    #     p1 = Point2D(1.0, 2.0)
    #     p2 = Point2D(1.1, 2.1)
    #     @test p == p1
    #     @test p != p2
    # end
end
