fix(test): enable concurrent execution and fix websocket test flakiness

Refactor websocket and web-server tests to use beforeAll/afterAll instead of beforeEach/afterEach, and improve WebSocket connection handling. Update CI to run tests concurrently.

This fixes flaky tests and improves CI performance.

Author: MBanucu

.github/workflows/ci.yml

@@ -44,7 +44,7 @@ jobs:
 
       - name: Run test
         if: matrix.quality == 'test'
-        run: bun test websocket.test.ts web-server.test.ts types.test.ts spawn-repeat.test.ts pty-tools.test.ts
+        run: bun test --concurrent websocket.test.ts web-server.test.ts types.test.ts spawn-repeat.test.ts pty-tools.test.ts
 
       - name: Type check
         if: matrix.quality == 'typecheck'

test/web-server.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect, beforeEach, afterEach } from 'bun:test'
+import { describe, it, expect, beforeAll, afterAll } from 'bun:test'
 import {
   initManager,
   manager,
@@ -22,14 +22,14 @@ describe('Web Server', () => {
   let server: PTYServer
   let disposableStack: DisposableStack
 
-  beforeEach(async () => {
+  beforeAll(async () => {
     disposableStack = new DisposableStack()
     initManager(fakeClient)
     server = await PTYServer.createServer()
     disposableStack.use(server)
   })
 
-  afterEach(() => {
+  afterAll(() => {
     manager.clearAllSessions()
     disposableStack.dispose()
     sessionUpdateCallbacks.length = 0