fix test to use faketimer (#12913)

packages/core/src/utils/llm-edit-fixer.test.ts

@@ -39,11 +39,22 @@ describe('FixLLMEditWithInstruction', () => {
   beforeEach(() => {
     vi.useFakeTimers();
     vi.clearAllMocks();
+    // Mock AbortSignal.timeout to use setTimeout so it respects fake timers
+    vi.spyOn(AbortSignal, 'timeout').mockImplementation((ms) => {
+      const controller = new AbortController();
+      setTimeout(
+        () =>
+          controller.abort(new DOMException('TimeoutError', 'TimeoutError')),
+        ms,
+      );
+      return controller.signal;
+    });
     resetLlmEditFixerCaches_TEST_ONLY(); // Ensure cache is cleared before each test
   });
 
   afterEach(() => {
     vi.useRealTimers(); // Reset timers after each test
+    vi.restoreAllMocks();
   });
 
   const mockApiResponse: SearchReplaceEdit = {
@@ -329,10 +340,7 @@ describe('FixLLMEditWithInstruction', () => {
     });
   });
 
-  it(
-    'should return null if the LLM call times out',
-    { timeout: 60000 },
-    async () => {
+  it('should return null if the LLM call times out', async () => {
     mockGenerateJson.mockImplementation(
       async ({ abortSignal }) =>
         // Simulate a long-running operation that never resolves on its own.
@@ -368,6 +376,5 @@ describe('FixLLMEditWithInstruction', () => {
 
     expect(result).toBeNull();
     expect(mockGenerateJson).toHaveBeenCalledOnce();
-    },
-  );
+  });
 });