Testing promises using QUnit

qunit-promises.js

QUnit.extend( QUnit, {
    expectSuccess: function (promise, message) {
        if (!promise) {
            QUnit.push(false, 'undefined promise', 'promise object', 'missing a promise');
            QUnit.start();
        } else {
            promise.then(function onSuccess(successMessage) {
                QUnit.push(true, null, null, successMessage);
                QUnit.start();
            }, function onFailure(errorMessage) {
                QUnit.push(false, 'failed', 'promise to be successful', message + '\n' + errorMessage);
                QUnit.start();
            });
        }
    },
 
    expectFailure: function (promise, message) {
        if (!promise) {
            QUnit.push(false, 'undefined promise', 'promise object', 'missing a promise');
            QUnit.start();
        } else {
            promise.then(function onSuccess(successMessage) {
                QUnit.push(false, 'succcess', 'promise to fail', message + '\n' + successMessage);
                QUnit.start();
            }, function onFailure(errorMessage) {
                QUnit.push(true, null, null, errorMessage);
                QUnit.start();
            });
        }
    }
});