# diffuser Test Suite Layout

`test/{basic,integration,edge}/` — standard EVOLV three-tier test
structure. The diffuser runtime modules live at `src/nodeClass.js`,
`src/specificClass.js`, and `src/commands/`; they implement the OTR /
ΔP aeration model and the `data.airFlow` / `set.kla` topic handlers
documented in `CONTRACT.md`.

Helpers shared across tiers belong in `test/helpers/`.

Run: `node --test test/basic test/integration test/edge`.