if you use function expression for that method you have to remember about hoisting

If anybody's interested:

Test.it("should have an averageWeight method", function () {
  Test.assertEquals(typeof Cat.averageWeight, 'function');
});

I've imlement this method (all test are passed). What does this test check? method typeof?? If yes, my code also passed sample tests, which are check method typeof too

seems pretty clear, doesn't it? :o
you have to define that averageWeight method, where appropriate for the current task.

What I should do in this test?? I've pass all test except this one!

should have an averageWeight method
Expected: 'function', instead got: 'undefined'

If string undefined or empty you must return '' (empty string).

perceNt, not perent :)