File Input Testing

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actionState: 'not selected',
  
  actions: {
    testAction: function(file) {
   		 this.set('actionState', file.name);
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{file-input action="testAction" }}
<br>
<br>
<h2 id="file-name">{{actionState}}</h2>

components.file-input.js

import Ember from 'ember';

export default Ember.Component.extend({
  change: function(evt) {
    const file = evt.target.files[0];
    Ember.Logger.log('changed', evt.target.files);
    
    if (file) {
    	this.sendAction('action', file);
    }
  }
});

templates.components.file-input.hbs

{{input type="file" id="my-file-chooser"}}

tests.acceptance.file-input-test.js

import { test } from 'qunit';
import moduleForAcceptance from '../../tests/helpers/module-for-acceptance';

moduleForAcceptance('File Chooser');

test('No File Attached', function(assert) {
  Ember.Logger.log('no file attached');
  
  visit('/');
  
  triggerEvent('#my-file-chooser', 'change');
  
  andThen(function() {
    assert.equal(find('#file-name').text(), "not selected");
  });
});

test('File Attached', function(assert) {
  Ember.Logger.log('file attached');
  
  const blob = new Blob(['test'], { type: 'text/plain' });
  blob["lastModifiedDate"] = "";
  blob["name"] = "example.txt"; 
  const file = blob;

  // alternative File object creation chrome only also doesn't work
  // const file = new File(["test"], "example.txt");
  
  visit('/');
  
  // seems like trying to pass { target } as an option breaks it as
  // something else, like { test : "file" } at least logs change in the console
  
  triggerEvent('#my-file-chooser', 'change', { target: { files: [file] } });
  
  andThen(function() {
    assert.equal(find('#file-name').text(), "example.txt");
  });
});

tests.helpers.destroy-app.js

import Ember from 'ember';

export default function destroyApp(application) {
  Ember.run(application, 'destroy');
}

tests.helpers.module-for-acceptance.js

import { module } from 'qunit';
import startApp from '../helpers/start-app';
import destroyApp from '../helpers/destroy-app';

export default function(name, options = {}) {
  module(name, {
    beforeEach() {
      this.application = startApp();

      if (options.beforeEach) {
        options.beforeEach.apply(this, arguments);
      }
    },

    afterEach() {
      if (options.afterEach) {
        options.afterEach.apply(this, arguments);
      }

      destroyApp(this.application);
    }
  });
}

tests.helpers.resolver.js

import Resolver from '../../resolver';
import config from '../../config/environment';

const resolver = Resolver.create();

resolver.namespace = {
  modulePrefix: config.modulePrefix,
  podModulePrefix: config.podModulePrefix
};

export default resolver;

tests.helpers.start-app.js

import Ember from 'ember';
import Application from '../../app';
import config from '../../config/environment';

export default function startApp(attrs) {
  let application;

  let attributes = Ember.merge({rootElement: "#test-root"}, config.APP);
  attributes = Ember.merge(attributes, attrs); // use defaults, but you can override;

  Ember.run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

tests.test-helper.js

import resolver from './helpers/resolver';
import {
  setResolver
} from 'ember-qunit';

setResolver(resolver);

twiddle.json

{
  "version": "0.6.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": true
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.4.3",
    "ember-template-compiler": "2.4.3"
  }
}