code/modules/unit_tests/breath.dm 
| /datum/unit_test/breath | Tests to ensure humans, plasmamen, and ashwalkers can breath in normal situations. Ensures algorithmic correctness of the "breathe()" and "toggle_internals()" procs. Built to prevent regression on an issue surrounding QUANTIZE() and BREATH_VOLUME. See the comment on BREATH_VOLUME for more details. |
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| /datum/unit_test/breath/breath_sanity_plasmamen | Tests to make sure plasmaman can breath from their internal tanks |
| /datum/unit_test/breath/breath_sanity_ashwalker | Tests to make sure ashwalkers can breathe from the lavaland air. |