code/modules/unit_tests/food_processor.dm

/datum/unit_test/food_processor	Makes sure that the input and output of food processor recipes, excluding where one is not a food item, have either matching food types or that, by adding foodtypes in the 'added_foodtypes' var of the recipe and removing foodtypes in the 'removed_foodtypes' var of the recipe, the foodtypes of the input would match the output TL;DR consistency.