Real rendering in jasmine with react

my_helper.js

  global.useComponent = function(componentToRender, defaultProperties) {
    defaultProperties = _.merge({}, defaultProperties);

    beforeEach(function() {
      this.renderComponent = function(opts) {
        opts = _.assign({}, defaultProperties, opts);

        this.component = TestUtils.renderIntoDocument(
          React.createElement(componentToRender, opts)
        );

        // Abusing `any-id` is a variable, dontchaknow.
        this.component = React.render(React.createElement(componentToRender, opts), root);

        Object.defineProperty(this, '$rendered', {
          get: function() { return $(this.component.getDOMNode()); },
          set: function() { }
        });
      };

      this.unmountComponent = function() {
        if (this.component) {
          React.unmountComponentAtNode(this.$rendered.parent()[0]);
          delete this.component;
          delete this.$rendered;
        }
      }
    });

    afterEach(function() {
      this.unmountComponent();
    });
  };