3

backend/tests/conftest.py

@@ -0,0 +1,44 @@
+"""测试配置：每个测试用例使用隔离的内存数据库。"""
+
+import pytest
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from app.core import db as db_module
+from app.models import Base
+
+
+@pytest.fixture(autouse=True)
+def _isolate_db(tmp_path, monkeypatch):
+    """每个测试用例：创建独立内存 SQLite → 建表 → 替换全局引擎 → 测试结束自动清理。
+
+    这确保测试之间完全隔离，不共享任何数据。
+    """
+    test_db_url = f"sqlite:///{tmp_path}/test.db"
+    engine = create_engine(test_db_url, connect_args={"check_same_thread": False})
+
+    # 启用 WAL + 外键
+    from sqlalchemy import event, text
+
+    @event.listens_for(engine, "connect")
+    def _set_pragma(dbapi_conn, _):
+        cursor = dbapi_conn.cursor()
+        cursor.execute("PRAGMA journal_mode=WAL")
+        cursor.execute("PRAGMA foreign_keys=ON")
+        cursor.close()
+
+    Base.metadata.create_all(engine)
+    test_factory = sessionmaker(bind=engine, expire_on_commit=False)
+
+    # 替换全局引擎和 session 工厂
+    monkeypatch.setattr(db_module, "_engine", engine)
+    monkeypatch.setattr(db_module, "_session_factory", test_factory)
+
+    # 清空内存 session 存储
+    from app.core import session as session_module
+
+    session_module._store.clear()
+
+    yield
+
+    engine.dispose()