test: add unit tests for WebSocket and Redis adapters

[phoenix-server]

Summary

The adapters have very low unit test coverage. The WebSocket adapter is the core connection handler and Redis is used for pub/sub — both are critical paths.

Files to cover

• src/adapters/web-socket-adapter.ts (26% statements, 2% branches)
• src/adapters/web-socket-server-adapter.ts (55% statements, 8% branches)
• src/adapters/redis-adapter.ts (6% statements)
• src/adapters/web-server-adapter.ts (67% statements, 17% branches)

Out of scope

All files outside src/adapters/.

Acceptance criteria

• Each adapter has a corresponding .spec.ts under test/unit/adapters/
• WebSocket lifecycle events (open, message, close, error) covered
• Redis pub/sub methods covered with a stubbed redis client
• npm run cover:unit passes without regressions

[Anshumancanrock]

hii @phoenix-server , could you please assign this issue to me? Thanks !

[phoenix-server]

Hi @Anshumancanrock! Thanks for your interest. You currently have 3 open assigned issues (#453, #407, #405) plus an open PR (#451). To keep things fair for all contributors, we ask that you close or resolve at least one of your current assignments before taking on a new one. Feel free to come back and claim this once you're done — it'll still be here!

[abhinavrathee]

@phoenix-server can you assign this work to me i can work on this

[phoenix-server]

Thanks @abhinavrathee! Go ahead and open a PR when you're ready — we'll review it.