Python: Isolate Foundry Hosting local test state

python/packages/foundry_hosting/tests/conftest.py

@@ -0,0 +1,13 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+"""Fixtures for Foundry Hosting tests."""
+
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def isolate_local_agentserver_state_root(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> None:
+    """Give each test an independent local AgentServer state root."""
+    monkeypatch.setenv("AGENTSERVER_STATE_ROOT", str(tmp_path / "agentserver-state"))

python/packages/foundry_hosting/tests/test_state_store.py

@@ -1,6 +1,8 @@
 # Copyright (c) Microsoft. All rights reserved.
+import os
 from collections.abc import Callable
 from dataclasses import dataclass
+from pathlib import Path
 from types import SimpleNamespace
 from typing import Any
 from unittest.mock import AsyncMock, MagicMock, patch
@@ -72,6 +74,13 @@ def _platform_context(call_id: str = "call-1", user_id: str = "user-1") -> Found
     return FoundryAgentRequestContext(call_id=call_id, user_id=user_id)
 
 
+def test_local_agentserver_state_root_is_test_scoped(tmp_path: Path) -> None:
+    """Independent tests must not share the local fallback state directory."""
+    state_root = Path(os.environ["AGENTSERVER_STATE_ROOT"])
+
+    assert state_root.is_relative_to(tmp_path)
+
+
 def test_storage_providers_use_public_abstraction() -> None:
     assert issubclass(CheckpointStoreProvider, ContextScopedStoreProvider)
     assert not issubclass(CheckpointStoreProvider, StoreProvider)