Lens Test

Finally I gathered up enough courage (+ money) to buy my first 'L'. A 70-200 f/4L. How do I test if the lens is a good copy? Is there any easy way without complicated setup-s to assess the quality of the lens. Like what kind of picture should I take to test? What should I look for in these pictures?

http://www.canon-dslr.com …/Canon_SLR_Focu​s_Test.htm

Tripod.
Cable release or timer if you can.
Stay near the minimum focus distance of the lens.

Thanks tim.