tests: refactor system tests

parthea · parthea · commit 9bdbd82b5b88 · 2026-03-03T22:25:45.000Z
diff --git a/packages/google-auth/system_tests/system_tests_sync/test_compute_engine.py b/packages/google-auth/system_tests/system_tests_sync/test_compute_engine.py
@@ -14,6 +14,7 @@
 
 from datetime import datetime
 
+import os
 import pytest
 
 import google.auth
@@ -29,11 +30,23 @@
 
 @pytest.fixture(autouse=True)
 def check_gce_environment(http_request):
+    # 1. Verify we are actually on a GCE instance
     try:
         _metadata.get_service_account_info(http_request)
     except exceptions.TransportError:
         pytest.skip("Compute Engine metadata service is not available.")
 
+    # 2. Prevent local Service Account key from overriding GCE credentials
+    original_creds = os.environ.get("GOOGLE_APPLICATION_CREDENTIALS")
+    if "GOOGLE_APPLICATION_CREDENTIALS" in os.environ:
+        del os.environ["GOOGLE_APPLICATION_CREDENTIALS"]
+
+    yield
+
+    # 3. Restore environment after the test
+    if original_creds is not None:
+        os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = original_creds
+
 
 def test_refresh(http_request, token_info):
     credentials = compute_engine.Credentials()
