code/modules/unit_tests/~nova/graffiti/codec.dm 
| /proc/graffiti_test_piece | A raw piece as Export writes it: an opaque and a translucent pixel at the top left of an unlit layer, under a glowing layer with one translucent pixel at the bottom right. |
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| /proc/graffiti_test_golden_piece | Returns a fixed piece for the flattened-bytes test: an opaque red base on rows 1-30, a translucent green glowing layer on rows 9-16 and a translucent white unlit one on rows 13-20, so it blends translucent over opaque and translucent over translucent, and its glow is mixed. |