Are there best practices for testing that the model class declares
the appropriate association linkages? Similarly are there good ways
to test that the model has declared desired acts_as_[list | tree]?
My first thought was to simply test if the model respond_to? either a
characteristic method of the association or even a more complete list
of methods. This would seem to be in-line with duck-typing, but it
also feels a little cumbersome. So how do you test-drive your