fix: adapt fixtures for pytest 9 rules

Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 830493430

Author: GWeale

tests/unittests/agents/test_resumable_llm_agent.py

@@ -100,7 +100,6 @@ class TestResumableLlmAgent:
   """Test suite for resumable LlmAgent."""
 
   @pytest.fixture
-  @pytest.mark.asyncio
   async def resumable_invocation_context(self):
     """Creates an invocation context for the specified agent."""
 

tests/unittests/cli/test_fast_api.py

@@ -410,11 +410,10 @@ async def create_test_eval_set(
 
 
 @pytest.fixture
-@pytest.mark.skipif(
-    sys.version_info < (3, 10), reason="A2A requires Python 3.10+"
-)
 def temp_agents_dir_with_a2a():
   """Create a temporary agents directory with A2A agent configurations for testing."""
+  if sys.version_info < (3, 10):
+    pytest.skip("A2A requires Python 3.10+")
   with tempfile.TemporaryDirectory() as temp_dir:
     # Create test agent directory
     agent_dir = Path(temp_dir) / "test_a2a_agent"
@@ -448,9 +447,6 @@ def __init__(self):
 
 
 @pytest.fixture
-@pytest.mark.skipif(
-    sys.version_info < (3, 10), reason="A2A requires Python 3.10+"
-)
 def test_app_with_a2a(
     mock_session_service,
     mock_artifact_service,
@@ -461,6 +457,8 @@ def test_app_with_a2a(
     temp_agents_dir_with_a2a,
 ):
   """Create a TestClient for the FastAPI app with A2A enabled."""
+  if sys.version_info < (3, 10):
+    pytest.skip("A2A requires Python 3.10+")
 
   # Mock A2A related classes
   with (