using Test

using stlProcess

using FileIO
using MeshIO

using LinearAlgebra

@testset "simple cube stl" begin
    """
    inertia math:
        https://hepweb.ucsd.edu/ph110b/110b_notes/node26.html

    Cube is a standard cube with a length of 2 for each side.
    """
    cube_path = raw"test_assets\cubeblender.stl"
    stl = load(cube_path)

    @testset "get_mass_properties" begin
        props = get_mass_properties(stl)

        @test props.volume == 8.0
        @test all(props.center_of_gravity .== 0.0)
        @test all(eigvals(props.inertia) .≈ (5.0 + 1 / 3))

        @testset "get_volume" begin
            @test get_volume(stl; scale=1) ≈ props.volume rtol = 0.01
            @test get_volume(stl; scale=4) ≈ (4 * 2)^3 rtol = 0.01
        end
    end
end