dynamicTriggerable.js

// Page Object Helper. 
// See http://ember-cli-page-object.js.org/docs/v1.8.x/components#custom-helper
import Ember from 'ember';

import { findElementWithAssert } from 'ember-cli-page-object';

function dynamicTriggerable(eventName, selector, options = {}) {
  return {
    isDescriptor: true,

    get() {
      return function(eventProperties = {}) {
        const el = findElementWithAssert(this, selector, options);
        const event = Ember.$.Event(
          eventName,
          Object.assign({}, options.eventProperties, eventProperties)
        );
        el.trigger(event);
        return this;
      };
    }
  };
}

// Page Object
// ...
searchInput: {
  scope: '.t-grid-search-input',
  keyup: dynamicTriggerable('keyup')
}
// ...

// Tests
page.searchInput.keyup({ keyCode: foo })