DRY up defintions of test models.
DRY up defintions of test models.

ludwigschubert/acts_as_list,swanandp/acts_as_list,qLearning/acts_as_list,exAspArk/acts_as_list,udit7590/acts_as_list,pacoguzman/acts_as_list,botandrose/acts_as_list,joeadcock/acts_as_list,tinderfields/acts_as_list,fabn/acts_as_list,roadtrippers/acts_as_list,corwinstephen/acts_as_list,amitree/acts_as_list