[zefei]

You are what defines your career, not the other way around. There are a lot of companies out there, some will see testifying as good, some bad. If your choice is true to yourself, and the company you want to work for really doesn't like that, I'd say eventually you will not go along well with that company and this acts as a "fail fast" filter.

Finding a good career path may take quite some time, but working for the wrong company can cost magnitudes of more time.

For most HN readers, including me, the answer is an obvious "testify", because we see it as a big plus. Do you want to work for people who see it as the right thing to do, or people who avoid it?