Unable to find partial in component test

I had my directory structure setup using ember-cli:

app/
    components/
        gear-menu.js
    pods/
    templates/
        components/
            gear-menu.hbs
        icon-gear.hbs

In gear-menu.js I have:

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['o-topbar-iconBtn'],
  showMenu: false,
  mouseEnter: function () {
    this.set('showMenu', true);
  },
  mouseLeave: function () {
    this.set('showMenu', false);
  }
});

In gear-menu.hbs I have:

{{#link-to 'settings' class='o-topbar-iconBtnLink'}}{{partial 'icon-gear'}}{{/link-to}}
<ul {{bind-attr class=':o-menu-box showMenu::hide'}}>
  <li class="o-menu-item">{{#link-to 'settings' class='o-menu-itemLink'}}Profile{{/link-to}}</li>
  <li class="o-menu-item">{{#link-to 'settings' class='o-menu-itemLink'}}Account{{/link-to}}</li>
  <li class="o-menu-item">{{#link-to 'settings' class='o-menu-itemLink'}}Sign Out{{/link-to}}</li>
</ul>

In my gear-menu test I have (note I’m using ember mocha for test):

/* jshint expr:true */

import {
  describeComponent,
  it
} from 'ember-mocha';
import resolver from '../../helpers/resolver';

describeComponent( 'gear-menu', 'GearMenuComponent', {}, function() {
  it('renders', function() {
    // creates the component instance
    var component = this.subject();
    expect(component._state).to.equal('preRender');

    // renders the component on the page
    this.render();
    expect(component._state).to.equal('inDOM');
  });
});

But I got:

not ok 19 PhantomJS 1.9 - GearMenuComponent renders
    ---
        message: >
            Assertion Failed: Unable to find partial with name 'icon-gear'.
        stack: >
            Error: Assertion Failed: Unable to find partial with name 'icon-gear'.
                at http://localhost:6410/assets/vendor.js:15936
                at renderPartial (http://localhost:6410/assets/vendor.js:21410)
                at partialHelper (http://localhost:6410/assets/vendor.js:21391)
                at program1 (http://localhost:6410/assets/pn-front.js:666)
                at http://localhost:6410/assets/vendor.js:9792
                at http://localhost:6410/assets/vendor.js:54370
                at EmberRenderer_createElement (http://localhost:6410/assets/vendor.js:51597)
                at Renderer_renderTree (http://localhost:6410/assets/vendor.js:22699)
                at http://localhost:6410/assets/vendor.js:22776
                at http://localhost:6410/assets/vendor.js:12750
                at http://localhost:6410/assets/vendor.js:12820
                at http://localhost:6410/assets/vendor.js:12206
                at http://localhost:6410/assets/vendor.js:12261
                at run (http://localhost:6410/assets/vendor.js:30294)
                at http://localhost:6410/assets/test-support.js:330
                at http://localhost:6410/assets/test-support.js:582
                at http://localhost:6410/assets/pn-front.js:1160
                at http://localhost:6410/assets/test-support.js:97
                at invoke (http://localhost:6410/assets/test-support.js:11948)
                at http://localhost:6410/assets/test-support.js:12013
                at http://localhost:6410/assets/test-support.js:5262
                at http://localhost:6410/assets/test-support.js:5681
                at http://localhost:6410/assets/test-support.js:5772
                at next (http://localhost:6410/assets/test-support.js:5606)
                at http://localhost:6410/assets/test-support.js:5616
                at next (http://localhost:6410/assets/test-support.js:5555)
                at http://localhost:6410/assets/test-support.js:5578
                at done (http://localhost:6410/assets/test-support.js:5241)
                at http://localhost:6410/assets/test-support.js:5261
                at complete (http://localhost:6410/assets/test-support.js:11975)
                at invoke (http://localhost:6410/assets/test-support.js:11955)
                at http://localhost:6410/assets/test-support.js:11939
                at http://localhost:6410/assets/test-support.js:5262
                at next (http://localhost:6410/assets/test-support.js:5579)
                at http://localhost:6410/assets/test-support.js:5583
                at timeslice (http://localhost:6410/assets/test-support.js:7007)
        Log: >
    ...

Everything works just what I wanted in browser, but in test it won’t find the partial. Anyone has any idea?

I am on ember 1.8.1 and ember cli 0.1.12