perf(test): eliminate resetModules via injectable seams

src/browser/pw-session.get-page-for-targetid.extension-fallback.test.ts

@@ -1,8 +1,23 @@
 import { describe, expect, it, vi } from "vitest";
+import { closePlaywrightBrowserConnection, getPageForTargetId } from "./pw-session.js";
+
+const connectOverCdpMock = vi.fn();
+const getChromeWebSocketUrlMock = vi.fn();
+
+vi.mock("playwright-core", () => ({
+  chromium: {
+    connectOverCDP: (...args: unknown[]) => connectOverCdpMock(...args),
+  },
+}));
+
+vi.mock("./chrome.js", () => ({
+  getChromeWebSocketUrl: (...args: unknown[]) => getChromeWebSocketUrlMock(...args),
+}));
 
 describe("pw-session getPageForTargetId", () => {
   it("falls back to the only page when CDP session attachment is blocked (extension relays)", async () => {
-    vi.resetModules();
+    connectOverCdpMock.mockReset();
+    getChromeWebSocketUrlMock.mockReset();
 
     const pageOn = vi.fn();
     const contextOn = vi.fn();
@@ -31,24 +46,16 @@ describe("pw-session getPageForTargetId", () => {
       close: browserClose,
     } as unknown as import("playwright-core").Browser;
 
-    vi.doMock("playwright-core", () => ({
-      chromium: {
-        connectOverCDP: vi.fn(async () => browser),
-      },
-    }));
+    connectOverCdpMock.mockResolvedValue(browser);
+    getChromeWebSocketUrlMock.mockResolvedValue(null);
 
-    vi.doMock("./chrome.js", () => ({
-      getChromeWebSocketUrl: vi.fn(async () => null),
-    }));
-
-    const mod = await import("./pw-session.js");
-    const resolved = await mod.getPageForTargetId({
+    const resolved = await getPageForTargetId({
       cdpUrl: "http://127.0.0.1:18792",
       targetId: "NOT_A_TAB",
     });
     expect(resolved).toBe(page);
 
-    await mod.closePlaywrightBrowserConnection();
+    await closePlaywrightBrowserConnection();
     expect(browserClose).toHaveBeenCalled();
   });
 });