1 files changed, 8 insertions, 1 deletions
diff --git a/packages/core/src/config/flashFallback.test.ts b/packages/core/src/config/flashFallback.test.ts
index cd78cd34..a0034ea1 100644
--- a/packages/core/src/config/flashFallback.test.ts
+++ b/packages/core/src/config/flashFallback.test.ts
@@ -4,14 +4,21 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { describe, it, expect, beforeEach } from 'vitest';
+import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { Config } from './config.js';
 import { DEFAULT_GEMINI_MODEL, DEFAULT_GEMINI_FLASH_MODEL } from './models.js';
+import fs from 'node:fs';
+
+vi.mock('node:fs');
 
 describe('Flash Model Fallback Configuration', () => {
   let config: Config;
 
   beforeEach(() => {
+    vi.mocked(fs.existsSync).mockReturnValue(true);
+    vi.mocked(fs.statSync).mockReturnValue({
+      isDirectory: () => true,
+    } as fs.Stats);
     config = new Config({
       sessionId: 'test-session',
       targetDir: '/test',