Add test for FormHelper::input() for hidden field.
Add test for FormHelper::input() for hidden field.

CVO-Technologies/cakephp,bravo-kernel/cakephp,HavokInspiration/cakephp,jeffblack360/cakephp,khoimt/cakephp-study,timhoeppner/cakephp,erikfig/cakephp,dakota/cakephp,ndm2/cakephp,nrother/cakephp,bravo-kernel/cakephp,erikfig/cakephp,kumamidori/cakephp,gmponos/cakephp,garethellis36/cakephp,web-player/cakephp,khoimt/cakephp-study,ADmad/cakephp,CVO-Technologies/cakephp,michaelze/cakephp,ndm2/cakephp,cakephp/cakephp,Phillaf/cakephp,Phillaf/cakephp,akintoey/cakephp,pbaire/cakephp,CakeDC/cakephp,gmponos/cakephp,tisu2tisu/cakephp,berrygoudswaard/cakephp,ionas/cakephp,kumamidori/cakephp,burriko/cakephp,thinkingmedia/cakephp,ndm2/cakephp,jerems02/cakephp,eboominathan/cakephp,justinyost/cakephp,jjj117/cakephp,mvdriel/cakephp,cakephp-fr/cakephp,jerems02/cakephp,cakephp-fr/cakephp,CakeDC/cakephp,ionas/cakephp,jeffblack360/cakephp,thinkingmedia/cakephp,davidyell/cakephp,mvdriel/cakephp,HavokInspiration/cakephp,garethellis36/cakephp,Balachan27/cakephp,jerems02/cakephp,yinhe007/cakephp,ADmad/cakephp,adopico/cakephp,tgr0ss/cakephp,thinkingmedia/cakephp,HavokInspiration/cakephp,cakephp/cakephp,eryw/cakephp,elboletaire/cakephp,garethellis36/cakephp,elboletaire/cakephp,berrygoudswaard/cakephp,tisu2tisu/cakephp,CakeDC/cakephp,cakephp/cakephp,gmponos/cakephp,ionas/cakephp,yinhe007/cakephp,eryw/cakephp,akintoey/cakephp,web-player/cakephp,CakeDC/cakephp,petteyg/cakephp,ADmad/cakephp,mvdriel/cakephp,akintoey/cakephp,cakephp/cakephp,eboominathan/cakephp,tenkoma/cakephp,eryw/cakephp,erikfig/cakephp,Balachan27/cakephp,pbaire/cakephp,nrother/cakephp,petteyg/cakephp,adopico/cakephp,tenkoma/cakephp,garethellis36/cakephp,tgr0ss/cakephp,nrother/cakephp,mvdriel/cakephp,adopico/cakephp,tgr0ss/cakephp,burriko/cakephp,dakota/cakephp,elboletaire/cakephp,dkarvounaris/cakephp,tenkoma/cakephp,petteyg/cakephp,timhoeppner/cakephp,ADmad/cakephp,timhoeppner/cakephp,davidyell/cakephp,bravo-kernel/cakephp,justinyost/cakephp,CVO-Technologies/cakephp,jeffblack360/cakephp,ndm2/cakephp,yinhe007/cakephp,michaelze/cakephp,dkarvounaris/cakephp,Phillaf/cakephp,dakota/cakephp,davidyell/cakephp,dkarvounaris/cakephp,petteyg/cakephp,kumamidori/cakephp,pbaire/cakephp,tenkoma/cakephp,web-player/cakephp,khoimt/cakephp-study,jjj117/cakephp,eboominathan/cakephp,tisu2tisu/cakephp,justinyost/cakephp,dakota/cakephp,burriko/cakephp,jjj117/cakephp,Balachan27/cakephp,cakephp-fr/cakephp,berrygoudswaard/cakephp,michaelze/cakephp