model.addTest(new VerticalStack());
model.addTest(new Breakable());
model.addTest(new ShapeEditing());
model.addTest(new OneSidedTest());
model.addTest(new PolyShapes());
model.addTest(new BodyTypes());
model.addTest(new CharacterCollision());
model.addTest(new ApplyForce());
// processing/filtering
model.addCategory("Processing/Filtering");