From time to time the question of test translations pop up. I usually oblige, providing the source text is reasonable in content and length, and the company seems reliable.
I did so once again recently, and just got back their feedback:
I just wanted to let you know that the proofreader from our team was very happy with your text. He did not change anything, and now we have delivered your test translation to our client and are waiting for his feedback. We will be in touch with you again, as soon as we receive the feedback.
Need I say I really enjoy this kind of emails first thing Monday morning?