What do you know about testing code?

Other questions included: A time where you found it difficult with a project and how you worked through that? What would you do if you found that your work is redundant? (I told them I would go to the manager and let them know, sometimes being a yes-man is not what they want, and its really not what you want. Although maybe they do need a yes-man, in my case I was lucky). What do you know about our company?