[racket] Disable/Enable Tests

On Sun, Nov 27, 2011 at 8:36 PM, Nadeem Abdul Hamid <nadeem at acm.org> wrote:
> This used to work approximately one year ago. It was very handy for
> students writing world/universe programs to be able to disable tests
> with their completed-and-tested animation/game, so that the program
> ran much faster in order to play, without having to wait for tons of
> tests to pass, especially those involving images.

Are these 2htdp/image-based programs? If so, can you share one with me
where the tests are especially slow?

Thanks,
Robby