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

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

module.exports = function (helpers) {
  var counter = 0;

  var component = helpers.mount(require.resolve("./index"), {
    counter: counter,
  });

  expect(component.el.querySelector(".unpreserved-counter").innerHTML).to.equal(
    "0",
  );
  expect(component.getEl("preserve").getAttribute("data-counter")).to.equal(
    "0",
  );
  expect(component.el.querySelector(".preserved-counter").innerHTML).to.equal(
    "0",
  );

  component.input = {
    counter: ++counter,
  };
  component.update();

  expect(component.el.querySelector(".unpreserved-counter").innerHTML).to.equal(
    "1",
  );
  expect(component.getEl("preserve").getAttribute("data-counter")).to.equal(
    "0",
  );
  expect(component.el.querySelector(".preserved-counter").innerHTML).to.equal(
    "0",
  );
};