var expect = require("chai").expect; module.exports = function (helpers, done) { var component = helpers.mount(require.resolve("./index.marko"), { size: "large", label: "Initial Label", }); component.onUpdate = function () { expect(component.el.className).to.contain("small"); done(); }; expect(component.el.className).to.contain("large"); component.setSize("small"); expect(component.el.className).to.not.contain("small"); };