Add tests for PluginCollection::create().
Add tests for PluginCollection::create().

cakephp/cakephp,CakeDC/cakephp,dakota/cakephp,ndm2/cakephp,ADmad/cakephp,dakota/cakephp,cakephp/cakephp,cakephp/cakephp,ndm2/cakephp,ADmad/cakephp,dakota/cakephp,ADmad/cakephp,ndm2/cakephp,ndm2/cakephp,CakeDC/cakephp,CakeDC/cakephp,dakota/cakephp,cakephp/cakephp,ADmad/cakephp,CakeDC/cakephp