feat(framework): net Transport 接口 + 测试用 FakeTransport

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cocoscreator_projects/YouleNexus/assets/framework/net/transport.ts

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+/**
+ * WebSocket 抽象（依赖注入点，D2）。
+ * 生产：Cocos/浏览器 WebSocket adapter（见 cocos-transport.ts）。
+ * 测试：内存 FakeTransport（模拟 server）。
+ */
+export interface Transport {
+  send(frame: string): void;
+  close(): void;
+  onOpen(cb: () => void): void;
+  onMessage(cb: (frame: string) => void): void;
+  onClose(cb: () => void): void;
+  /** 发起连接（建立后应触发 onOpen）。 */
+  connect(url: string): void;
+}

cocoscreator_projects/framework-tests/helpers/fake-transport.ts

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+import type { Transport } from '../../YouleNexus/assets/framework/net/transport.ts';
+
+/** 内存 Transport：模拟服务器。用 microtask 队列异步触发回调，贴近真实 WS 时序。 */
+export class FakeTransport implements Transport {
+  sent: string[] = [];
+  url = '';
+  private openCb?: () => void;
+  private msgCb?: (f: string) => void;
+  private closeCb?: () => void;
+  private pending: Array<() => void> = [];
+  private closed = false;
+
+  connect(url: string): void { this.url = url; this.pending.push(() => this.openCb?.()); }
+  send(frame: string): void { if (!this.closed) this.sent.push(frame); }
+  close(): void { if (this.closed) return; this.closed = true; this.pending.push(() => this.closeCb?.()); }
+  onOpen(cb: () => void): void { this.openCb = cb; }
+  onMessage(cb: (f: string) => void): void { this.msgCb = cb; }
+  onClose(cb: () => void): void { this.closeCb = cb; }
+
+  /** 测试侧：模拟服务器推一帧给客户端。 */
+  serverPush(frame: string): void { if (!this.closed) this.pending.push(() => this.msgCb?.(frame)); }
+
+  /** 冲刷所有挂起回调（解析微任务）。 */
+  async flush(): Promise<void> {
+    while (this.pending.length) { const fn = this.pending.shift()!; fn(); await Promise.resolve(); }
+  }
+}

cocoscreator_projects/framework-tests/net/transport.test.ts

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+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { FakeTransport } from '../helpers/fake-transport.ts';
+
+test('FakeTransport：connect 后异步触发 onOpen', async () => {
+  const t = new FakeTransport();
+  let opened = false;
+  t.onOpen(() => { opened = true; });
+  t.connect('ws://x');
+  await t.flush();
+  assert.equal(opened, true);
+});
+
+test('FakeTransport：客户端 send 进入 sent 队列；serverPush 触发 onMessage', async () => {
+  const t = new FakeTransport();
+  const got: string[] = [];
+  t.onMessage((f) => got.push(f));
+  t.connect('ws://x');
+  await t.flush();
+  t.send('hello');
+  assert.deepEqual(t.sent, ['hello']);
+  t.serverPush('world');
+  await t.flush();
+  assert.deepEqual(got, ['world']);
+});
+
+test('FakeTransport：close 触发 onClose', async () => {
+  const t = new FakeTransport();
+  let closed = false;
+  t.onClose(() => { closed = true; });
+  t.connect('ws://x');
+  await t.flush();
+  t.close();
+  await t.flush();
+  assert.equal(closed, true);
+});