feat: Multi-Directory Workspace Support (part1: add --include-directories option) (#4605)

Co-authored-by: Allen Hutchison <adh@google.com>

packages/core/src/tools/tool-registry.test.ts

@@ -30,6 +30,9 @@ import {
   Schema,
 } from '@google/genai';
 import { spawn } from 'node:child_process';
+import fs from 'node:fs';
+
+vi.mock('node:fs');
 
 // Use vi.hoisted to define the mock function so it can be used in the vi.mock factory
 const mockDiscoverMcpTools = vi.hoisted(() => vi.fn());
@@ -144,6 +147,10 @@ describe('ToolRegistry', () => {
   let mockConfigGetToolDiscoveryCommand: ReturnType<typeof vi.spyOn>;
 
   beforeEach(() => {
+    vi.mocked(fs.existsSync).mockReturnValue(true);
+    vi.mocked(fs.statSync).mockReturnValue({
+      isDirectory: () => true,
+    } as fs.Stats);
     config = new Config(baseConfigParams);
     toolRegistry = new ToolRegistry(config);
     vi.spyOn(console, 'warn').mockImplementation(() => {});