🧪 Add test for error path in loadSession (#41)

* 🧪 Add test for error path in loadSession

Co-authored-by: sunnylqm <615282+sunnylqm@users.noreply.github.com>

* Fix linting errors

Co-authored-by: sunnylqm <615282+sunnylqm@users.noreply.github.com>

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: sunnylqm <615282+sunnylqm@users.noreply.github.com>

Author: sunnylqm

tests/api.test.ts

@@ -67,6 +67,17 @@ describe('api.ts session management', () => {
     await expect(loadSession()).rejects.toThrow(SyntaxError);
   });
 
+  test('loadSession throws when reading credential file fails', async () => {
+    existsSyncSpy = spyOn(fs, 'existsSync').mockReturnValue(true);
+    readFileSyncSpy = spyOn(fs, 'readFileSync').mockImplementation(() => {
+      throw new Error('Read error');
+    });
+
+    await expect(loadSession()).rejects.toThrow('Read error');
+    expect(console.error).toHaveBeenCalledWith(
+      expect.stringContaining('Failed to parse file'),
+    );
+  });
   test('replaceSession sets session', () => {
     replaceSession({ token: 'new-token' });
     expect(getSession()?.token).toBe('new-token');