code/modules/unit_tests/~nova/custom_sprites/appearance.dm

/proc/custom_sprite_test_drawing	A version 1 drawing painted solid with palette index `shade` in every view.
/proc/custom_sprite_test_same_pixels	Whether two icons have the same pixels in every cardinal view of their 32 by 32 area.
/proc/custom_sprite_test_taur	The real external organ path, including its hidden leg slots and matrixed sprite layers.
/proc/custom_sprite_test_wide_drawing	A version 3 taur-zone drawing whose every row is `row` (64 indexes), solid colour 1 by default.
/proc/custom_style_test_two_color_drawing	Two colors, split evenly, so a recolor can be checked on both the palette and the pixels.
/proc/custom_style_test_facial_style	The name of the first facial hairstyle that has a sprite.