Thom Hogan's ebook on the D7000 includes a tif file of a focus test. To be printed out and then mounted to a wall for the test. Or, to be opened on a computer screen for an optical test.
He also suggests a commercial firm that sells such test patterns, but warns that they are expensive.
It is against forum rules to disseminate copyrighted material, but you can buy Thom's book if you go to his website --- www.bythom.com ----. His publications for sale are listed in the right column.
I shot the test pattern with a 12-24, 16-85, 60mm G, 80-200. Looking through the LiveView at 32x magnification, resolution was quite sharp. Have you tried looking through LIveView and hitting the + button to extreme magnification?