Test a Helldivers 2 Lua mod offline by faking the engine boundary with lupa on real LuaJIT — count GUI creates/destroys, drive a staged bring-up through no-engine / no-world / full-engine / failing-body states, exercise a frame error budget, and assert invariants that otherwise cost a live run. Use when adding an offline test for a mod, or when you want to catch a boot-order or teardown bug without deploying.
