Hook
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Pytest Hook 的类型::

    1. Bootstrapping Hooks
    2. Initialization Hooks
    3. Collection Hooks
    4. Test running (runtest) hooks
    5. Reporting Hooks
    6. Debugging/Interaction Hooks

Ordering of Pytest Hooks::

    1. tryfirst=True: Execution as Early as Possible
    2. trylast=True: Execution as Late as Possible
    3. hookwrapper=True: Hook Wrappers
        creates a hook that wraps around all others. 
        It can execute code both before and after the standard hooks.
        示例:
        @pytest.hookimpl(hookwrapper=True)
        def pytest_collection_modifyitems(items):
            # 在all non-wrapper hooks 运行前运行
            outcome = yield
            # 在all non-wrapper hooks 运行后运行

    4. optionalhook=True: 这个参数表示这个钩子函数是可选的，它应该被调用，但可以忽略



pytest_collection_modifyitems()函数::

    四个参数:
        item：当前测试用例的对象
        call：表示测试用例的调用状态，包括 setup, call, teardown 三个阶段
        keyword：关键字参数，通常不需要手动传递
        outcome：测试结果信息