---
id: worker-adapter-tests
name: Write tests for Worker event target adapter
status: completed
depends_on: [worker-adapter-implementation]
scope: moderate
risk: medium
impact: component
level: implementation
---

## Description

Write tests for the Worker event target adapter(s). Testing Workers is non-trivial because it requires creating actual Worker instances or mocking the `postMessage`/`onmessage` API.

Test scenarios from the architecture doc:
1. Main → Worker send — dispatchEvent from main posts message to worker
2. Worker → Main send — dispatchEvent from worker posts message to main
3. Bidirectional — both sides can subscribe and publish
4. Topic scoping — type:id topics correctly formed
5. Envelope round-trip — full envelope survives serialization
6. Worker termination — cleanup when worker exits

## Acceptance Criteria

- [ ] `test/event-target-worker.test.ts` exists and passes
- [ ] Mock strategy for Worker environment established (actual workers, vitest worker threads, or mocked postMessage)
- [ ] Test: host dispatchEvent posts message to worker via postMessage
- [ ] Test: worker thread dispatchEvent posts message to parent
- [ ] Test: bidirectional communication works
- [ ] Test: type:id topic scoping works correctly
- [ ] Test: EventEnvelope round-trips through serialization
- [ ] Test: addEventListener and removeEventListener work on both sides

## References

- docs/architecture/event-targets/worker.md (Test Plan section)
- src/event-target-worker.ts

## Notes

> To be filled by implementation agent

## Summary

> To be filled on completion