joerx

var Aws = require('aws-sdk');
var sinon = require('sinon');

// Only works for 'createBucket', 'update' and a few others since most API methods are generated dynamically
// upon instantiation. Very counterintuitive, thanks Amazon!
var createBucket = sinon.stub(Aws.S3.prototype, 'createBucket');
createBucket.yields(null, 'Me create bucket');

// For other methods, we can 'assign' the stubs to the proto, already defined function won't be overridden
var listBuckets = Aws.S3.prototype.listBuckets = sinon.stub();

sonnyt

function hasClass(element, className) {
    return element.className && new RegExp("(^|\\s)" + className + "(\\s|$)").test(element.className);
}

var myDiv = document.getElementById('MyDiv');

hasClass(myDiv, 'active');

// OR