The 'describe' keyword in javascript

Question

So I am a newbie in javascript and i had been going through some one else's code and I found this..

describe('deviceready', function() {
    it('should report that it fired', function() {
        spyOn(app, 'report');
        app.deviceready();
        expect(app.report).toHaveBeenCalledWith('deviceready');
    });
});

What I don't understand is: What exactly does the describe keyword do?

info:
- Its a phonegap application
- We are using the spine.js and jQuery libraries

Answer 1

Describe is a function in the Jasmine testing framework. It simply describes the suite of test cases enumerated by the "it" functions.

Also used in the mochajs framework.

Answer 2

Describe is not part of Javascript, it is a function defined in the library you used (namely Jasmine)

Answer 3

"A test suite begins with a call to the global Jasmine function describe with two parameters: a string and a function. The string is a name or title for a spec suite - usually what is being tested. The function is a block of code that implements the suite."

source: http://jasmine.github.io/2.0/introduction.html