marko/packages/runtime-class/test/components-browser/fixtures/component-preserve-dom-attrs-dynamic/test.js

var expect = require("chai").expect;

module.exports = function (helpers) {
  var component = helpers.mount(require.resolve("./index"), {
    className: "foo",
  });

  var span = component.el.querySelector("span");
  expect(span.className).to.equal("foo");

  component.setState("className", "bar");
  component.update();

  expect(span.className).to.equal("foo");
};