How to test this controller?

I have my snippet and test script here: http://bin.cakephp.org/view/742474770

But when I run the test script it shows

Fatal error: Call to a member function is() on a non-object in/Applications/XAMPP/xamppfiles/htdocs/cakephp2.1.1/app/Controller/PrinciplesController.phpon line 12

Can someone show a working example?

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