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Can we add a test to ensure that if there are any errors, the watcher can be closed with a zero exit code?

Can we add a test to ensure that if there are any errors, the watcher can be closed with a zero exit code?

I tested it, because the watcher.close is a async,onExit maybe could't wait watcher.close finish, it is unstable. It is difficult to add a stable test for it, so let us skip it at now.

I get some info after research, it is difficult to ensure async task is finished at process exit. But here has a helper info us to out.

If you ^C a process, the kernel sends a SIGINT to the process group; that usually terminates both the parent and its children, grandchildren, and so on.

So we only need to care about is using watch cli bin at child process, Like test watch-cli using child process, it is unstable at process exit. So here i suggest to skip it at now.

tracking test at #2584