pezra/couchrest_model — comment on commit 39c60d77d2f31c59c530a49ba259fab629c7f35f
File:  line 0
By pezra:

That could work if we were very careful that the class was never been used before duping it. If, however, any test runs that uses the class its design document will get cached and `#dup` will happily duplicated that cached document into the test fixture class, there by invalidating the test. I am not sure exactly how you would ensure that the class was never used before it was duplicated.