The editing and writing test I took for the sales writing department was very thorough. The editing portion contained actual text that could be used in Imagine Learning materials, rather than a standardized editing test. This made the test seem more practical. The editing test included standard copy editing; rewriting sentences for clarity and to eliminate wordiness; and editing a letter. I didn't detect any trickiness in any of the editing portions.
The writing portion was more difficult, with four writing tasks to complete. I felt the writing tasks could have used more instruction. For example, one task was to write a summary of a one-page article but you aren't told who the target audience is. Other tasks were to write text for an advertisement; write a summary of the company that met certain criteria; and change prose to step-by-step instructions.
I was given two hours to complete the test but was told if it took a bit longer that was OK (I took an extra 15 minutes). With the editing and writing, it was quite a bit to get done in two hours. Definitely a good test of how quickly and accurately you work.
This was followed by an in-person interview a few days later, where I talked with three people from the sales writing department and someone from marketing. The questions were more positive, designed to see what kind of person you were and how you worked. Very few negative questions (i.e., what do you do when you don't get along with someone in the office). I enjoyed talking with everyone.