test(cloudflare-workers): add comprehensive tests for websocket and conninfo adapters

[rokasta12]

Summary

• Add 12 new tests to websocket.test.ts (14 total, up from 2), achieving 100% statement/branch/function/line coverage of websocket.ts
• Add 1 new test to conninfo.test.ts for absent cf-connecting-ip header, matching the pattern in the Cloudflare Pages adapter

WebSocket Tests Added

Test	Source lines covered
101 response with webSocket set to client	L48-52 (Response construction)
server.accept() called during upgrade	L46-47
onClose handler triggered	L36-37 (conditional addEventListener)
onError handler triggered	L42-43 (conditional addEventListener)
No event listeners when no handlers provided	L36, L39, L42 (branch: false)
send() delegated to server.send()	L31 (WSContext send)
close() delegated to server.close()	L22 (WSContext close)
protocol exposed through WSContext	L23-25 (getter)
readyState exposed through WSContext	L27-29 (getter)
url converted to URL when present	L30 (truthy branch)
url set to null when falsy	L30 (falsy branch)
raw set to server WebSocket	L26

Test Infrastructure

• Extracted createMockWebSocketPair() helper that creates isolated mocks per test (EventTarget-based server with accept/close/send as vi.fn())
• Added CloseEvent polyfill for Node.js/vitest environment
• Mocked Response constructor for the 101 status test (Node.js restricts status to 200-599, but Cloudflare Workers allows 101)

Conninfo Test Added

• Verifies getConnInfo() returns undefined address when cf-connecting-ip header is absent (matches the existing pattern in cloudflare-pages/conninfo.test.ts)

Checklist

• Tests pass: npx vitest --run src/adapter/cloudflare-workers/websocket.test.ts (14/14)
• Tests pass: npx vitest --run src/adapter/cloudflare-workers/conninfo.test.ts (2/2)
• TypeScript: npx tsc --noEmit — zero errors
• Formatting: bun run format:fix — no changes needed
• Linting: bun run lint:fix — zero errors (only pre-existing warnings)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.50%. Comparing base (2de30d7) to head (129578e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4748      +/-   ##
==========================================
+ Coverage   91.48%   91.50%   +0.01%     
==========================================
  Files         177      177              
  Lines       11556    11556              
  Branches     3357     3364       +7     
==========================================
+ Hits        10572    10574       +2     
+ Misses        983      981       -2     
  Partials        1        1              

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