test: 添加测试框架和全面的单元测试

- 添加 pytest 配置和测试依赖到 requirements.txt
- 创建测试包结构和 fixtures (conftest.py)
- 添加数据库模块的 CRUD 操作测试 (test_database.py)
- 添加 Provider 插件系统测试 (test_providers.py)
- 添加调度器模块测试 (test_scheduler.py)
- 添加 API 路由测试 (test_api.py)
- 添加回归测试覆盖边界条件和错误处理 (test_regressions.py)
- 添加健康检查端点用于容器监控
- 修复调度器中的日历计算逻辑和任务执行参数处理
- 更新数据库函数以返回操作结果状态

tests/conftest.py

@@ -0,0 +1,77 @@
+"""测试配置和 fixtures"""
+
+import asyncio
+import tempfile
+import uuid
+from pathlib import Path
+
+import pytest
+
+from app.config import AppConfig, load_config
+from app.database import close_db, get_db
+
+
+@pytest.fixture(scope="session")
+def event_loop():
+    """创建事件循环"""
+    loop = asyncio.get_event_loop_policy().new_event_loop()
+    yield loop
+    loop.close()
+
+
+@pytest.fixture
+async def temp_db():
+    """临时数据库 fixture"""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        # 使用唯一的文件名确保每个测试都使用新数据库
+        db_path = Path(tmpdir) / f"test_{uuid.uuid4().hex}.db"
+        # 修改配置使用临时数据库
+        import app.config as config_module
+        original_db_path = config_module.settings.database.path
+        config_module.settings.database.path = str(db_path)
+
+        # 确保使用新的数据库连接
+        import app.database as db_module
+        db_module._db = None
+
+        yield db_path
+
+        # 清理
+        await close_db()
+        config_module.settings.database.path = original_db_path
+        db_module._db = None
+
+
+@pytest.fixture
+async def temp_storage():
+    """临时存储目录 fixture"""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        import app.config as config_module
+        original_storage_path = config_module.settings.storage.path
+        config_module.settings.storage.path = tmpdir
+
+        yield tmpdir
+
+        config_module.settings.storage.path = original_storage_path
+
+
+@pytest.fixture
+async def db(temp_db):
+    """初始化数据库 fixture"""
+    from app import database as db_module
+    await get_db()
+    return db_module
+
+
+@pytest.fixture
+def sample_plan():
+    """示例 Plan 数据"""
+    return {
+        "name": "Test Plan",
+        "provider_name": "openai",
+        "api_key": "sk-test-key",
+        "api_base": "https://api.openai.com/v1",
+        "plan_type": "coding",
+        "supported_models": ["gpt-4", "gpt-3.5-turbo"],
+        "enabled": True,
+    }