完成错误测试用例

backend/tests/conftest.py

@@ -0,0 +1,18 @@
+"""pytest 配置与公共 fixture（依据 API 文档）"""
+import pytest
+from fastapi.testclient import TestClient
+from app import app, PROJECTS, OPERATION_LOGS
+
+
+@pytest.fixture(autouse=True)
+def reset_store():
+    """每个测试前清空内存存储，保证隔离"""
+    PROJECTS.clear()
+    OPERATION_LOGS.clear()
+    yield
+
+
+@pytest.fixture
+def client():
+    """同步测试用：FastAPI TestClient"""
+    return TestClient(app)