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Can be used inside client integration tests to wait for elements to change
observeMutationsHelper = function(targetSelector, done, callback) {
var target = document.querySelector(targetSelector);
var observer = new MutationObserver(function(mutations) {
var config = {
attributes: true,
childList: true,
characterData: true
observer.observe(target, config);
describe('header', function() {
it("should change after some event", function(done) {
var btn = $("#change-header");
expect($('h1').textContent).toEqual('old header');
// Wait for header to change using MutationObserver, not part of meteor but a browser API
observeMutationsHelper('h1', done, function(mutations) {
expect(mutations[0].target.textContent).toEqual("new header");

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