事件:'test:stderr'
【Event: 'test:stderr'】
当正在运行的测试写入 stderr 时触发。只有在传递了 --test 标志时才会触发此事件。此事件不保证按测试定义的顺序触发。
【Emitted when a running test writes to stderr.
This event is only emitted if --test flag is passed.
This event is not guaranteed to be emitted in the same order as the tests are
defined.】