refactor(channels): dedupe transport and gateway test scaffolds

src/browser/server-context.chrome-test-harness.ts

@@ -0,0 +1,24 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { afterAll, beforeAll, vi } from "vitest";
+
+const chromeUserDataDir = { dir: "/tmp/openclaw" };
+
+beforeAll(async () => {
+  chromeUserDataDir.dir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-chrome-user-data-"));
+});
+
+afterAll(async () => {
+  await fs.rm(chromeUserDataDir.dir, { recursive: true, force: true });
+});
+
+vi.mock("./chrome.js", () => ({
+  isChromeCdpReady: vi.fn(async () => true),
+  isChromeReachable: vi.fn(async () => true),
+  launchOpenClawChrome: vi.fn(async () => {
+    throw new Error("unexpected launch");
+  }),
+  resolveOpenClawUserDataDir: vi.fn(() => chromeUserDataDir.dir),
+  stopOpenClawChrome: vi.fn(async () => {}),
+}));