diff --git a/packages/cli/src/config/auth.test.ts b/packages/cli/src/config/auth.test.ts
index fb951f8aa4..8d565dca13 100644
--- a/packages/cli/src/config/auth.test.ts
+++ b/packages/cli/src/config/auth.test.ts
@@ -39,7 +39,7 @@ describe('validateAuthMethod', () => {
     });
 
     it('should return an error message if GEMINI_API_KEY is not set', () => {
-      vi.stubEnv('GEMINI_API_KEY', '');
+      vi.stubEnv('GEMINI_API_KEY', undefined);
       expect(validateAuthMethod(AuthType.USE_GEMINI)).toBe(
         'GEMINI_API_KEY environment variable not found. Add that to your environment and try again (no reload needed if using .env)!',
       );
@@ -59,6 +59,8 @@ describe('validateAuthMethod', () => {
     });
 
     it('should return an error message if no required environment variables are set', () => {
+      vi.stubEnv('GOOGLE_CLOUD_PROJECT', undefined);
+      vi.stubEnv('GOOGLE_CLOUD_LOCATION', undefined);
       expect(validateAuthMethod(AuthType.USE_VERTEX_AI)).toBe(
         'When using Vertex AI, you must specify either:\n' +
           '• GOOGLE_CLOUD_PROJECT and GOOGLE_CLOUD_LOCATION environment variables.\n' +