text: var expect = require('chai').expect;
  
  module.exports = function (helpers) {
      var counter = 0;
  
      var widget = helpers.mount(require('./index'), {
          counter: counter
      });
  
      expect(widget.el.querySelector('.unpreserved-counter').innerHTML).to.equal('0');
      expect(widget.el.querySelector('.preserve').getAttribute('data-counter')).to.equal('0');
      expect(widget.el.querySelector('.preserved-counter').innerHTML).to.equal('0');
  
      widget.rerender({
          counter: ++counter
      });
  
      expect(widget.el.querySelector('.unpreserved-counter').innerHTML).to.equal('1');
      expect(widget.el.querySelector('.preserve').getAttribute('data-counter')).to.equal('0');
      expect(widget.el.querySelector('.preserved-counter').innerHTML).to.equal('0');
  };