Protect stdout and stderr so JavaScript code can't accidentally write to stdout corrupting ink rendering (#13247)

Bypassing rules as link checker failure is spurious.

packages/cli/src/commands/extensions/enable.test.ts

@@ -13,6 +13,7 @@ import {
   afterEach,
   type Mock,
 } from 'vitest';
+import { format } from 'node:util';
 import { type CommandModule, type Argv } from 'yargs';
 import { handleEnable, enableCommand } from './enable.js';
 import { ExtensionManager } from '../../config/extension-manager.js';
@@ -24,17 +25,25 @@ import {
 import { FatalConfigError } from '@google/gemini-cli-core';
 
 // Mock dependencies
-vi.mock('../../config/extension-manager.js');
-vi.mock('../../config/settings.js');
+const emitConsoleLog = vi.hoisted(() => vi.fn());
+const debugLogger = vi.hoisted(() => ({
+  log: vi.fn((message, ...args) => {
+    emitConsoleLog('log', format(message, ...args));
+  }),
+  error: vi.fn((message, ...args) => {
+    emitConsoleLog('error', format(message, ...args));
+  }),
+}));
+
 vi.mock('@google/gemini-cli-core', async (importOriginal) => {
   const actual =
     await importOriginal<typeof import('@google/gemini-cli-core')>();
   return {
     ...actual,
-    debugLogger: {
-      log: vi.fn(),
-      error: vi.fn(),
+    coreEvents: {
+      emitConsoleLog,
     },
+    debugLogger,
     getErrorMessage: vi.fn((error: { message: string }) => error.message),
     FatalConfigError: class extends Error {
       constructor(message: string) {
@@ -44,22 +53,18 @@ vi.mock('@google/gemini-cli-core', async (importOriginal) => {
     },
   };
 });
+
+vi.mock('../../config/extension-manager.js');
+vi.mock('../../config/settings.js');
 vi.mock('../../config/extensions/consent.js');
 vi.mock('../../config/extensions/extensionSettings.js');
 
 describe('extensions enable command', () => {
   const mockLoadSettings = vi.mocked(loadSettings);
   const mockExtensionManager = vi.mocked(ExtensionManager);
-  interface MockDebugLogger {
-    log: Mock;
-    error: Mock;
-  }
-  let mockDebugLogger: MockDebugLogger;
 
   beforeEach(async () => {
     vi.clearAllMocks();
-    mockDebugLogger = (await import('@google/gemini-cli-core'))
-      .debugLogger as unknown as MockDebugLogger;
     mockLoadSettings.mockReturnValue({
       merged: {},
     } as unknown as LoadedSettings);
@@ -106,7 +111,7 @@ describe('extensions enable command', () => {
         expect(
           mockExtensionManager.prototype.enableExtension,
         ).toHaveBeenCalledWith(name, expectedScope);
-        expect(mockDebugLogger.log).toHaveBeenCalledWith(expectedLog);
+        expect(emitConsoleLog).toHaveBeenCalledWith('log', expectedLog);
         mockCwd.mockRestore();
       },
     );