OpenSCAD hollow test case

gistfile1.txt

//----TEST 1 ----------------
module test1() {
module hollow_cube() {

polyhedron([[-5,5,-5],[-5,-5,-5],[-5,-5,5],[-5,5,5],[5,-5,-5],[5,-5,5],[5,5,5],[5,5,-5],[-2.5,2.5,-2.5],[-2.5,-2.5,-2.5],[-2.5,-2.5,2.5],[-2.5,2.5,2.5],[2.5,-2.5,-2.5],[2.5,-2.5,2.5],[2.5,2.5,2.5],[2.5,2.5,-2.5]],[[0,1,2,3],[2,1,4,5],[3,2,5,6],[4,1,0,7],[7,0,3,6],[5,4,7,6],[8,9,10,11],[10,9,12,13],[11,10,13,14],[12,9,8,15],[15,8,11,14],[13,12,15,14]]);

}


difference(){
hollow_cube();
cube(5);
}
}


//-----TEST 2 ----------------
module test2() {
module hollow_cube() {
difference(){
cube(10,center=true);
cube(5,center=true);
}
}


difference(){
hollow_cube();
cube(5);
}

}



test1();