code/modules/unit_tests/crafting.dm

/datum/unit_test/crafting	Check if a generic atom (because both mobs and the crafter machinery can do it) can potentially craft all recipes, with the exact same types required in the recipe. Then, unless the recipe has the CRAFT_SKIP_MATERIALS_PARITY flag, compare the materials of the crafted result with a spawned instance of the same type to ensure that they match.