Ember-CLI tests can't include modules from 'app' directory

Question

I am trying to include a module in my app from one of the tests. Is it even possible to do that? I am only able to include a module in the 'tests' directory. I keep getting the infamous "Could not find module" error.

http://localhost:4200/assets/test-support.js:5578:16: Could not find module d3graph/app/controllers/index imported from d3graph/tests/unit/utils/graph-helper-test

This is my test code:

import { moduleFor, test }  from 'ember-qunit';
import Ember from 'ember';
import helper from '../../../app/anything/anywhere';  // <- THIS LINE FAILS

moduleFor('util:graph-helper', 'Graph Helper', {
  beforeEach: () => initialize()
});

function initialize() { /* something */ };

test('test desc', function(assert) {
  var testObj = this.subject();

  // test logic follows
});

I did try various modifications of the path to the module, including absolute path from root, I even tried including via 'require()', but alas without success. Please help.

Answer 1

Shouldn't be a problem. You will need a needs line inside your moduleFor call:

import { moduleFor, test }  from 'ember-qunit';
import Ember from 'ember';

moduleFor('util:graph-helper', 'Graph Helper', {
    needs: ['controller:index'],

   beforeEach: () => initialize()
});

function initialize() { /* something */ };

test('test desc', function(assert) {
    var testObj = this.subject();

    // test logic follows
});

See http://guides.emberjs.com/v1.10.0/testing/testing-controllers/#toc_testing-controller-needs for more details about needs.

Edit

Disregard the above information... that's for Ember modules which resolve the standard way. To include modules off the beaten Ember path, a simple ES6 import will suffice (this example demonstrates pulling in some-util for the controller:index unit tests):

import { moduleFor, test }  from 'ember-qunit';
import Ember from 'ember';
import SomeUsefulUtil from '<application-name>/utils/some-useful-util';

moduleFor('controller:index', 'Graph Helper', {
   beforeEach: () => initialize()
});

function initialize() { /* something */ };

test('test desc', function(assert) {
    var testObj = this.subject();

    // Create utility class instance
    var someUsefulUtilInstance = new SomeUsefulUtil();

    // test logic follows
});

The potentially non-intuitive part of this is that you have to prefix the import with your application's name instead of the standard app directory.