Testing promises with mocha

test.js

var assert = require('chai').assert;
var when = require('when');


var def1 = when.defer();

function getProm() {
  return def1.promise;
}

suite('Test a promise', function() {

  test('an async test with a promise', function(done){

    function onResolve(val) {
      assert.equal('bar', val, 'Value should be "bar"');
      done();
    }

    // the trick is the final .otherwise that will catch
    // the error thrown in the 'onResolve' function
    getProm().then(onResolve, done).otherwise(done);
  });
});

def1.resolve('foo');

wouldnt be cool to adopt the given-when-then of BDD into mocha with something like this:

it('test', function(){

return given().when().then()

});

does anybody know what I am talking about?