Add mixin unit tests for dob-days

bower.json

@@ -13,5 +13,8 @@
     "typeahead.js": "~0.11.1",
     "pouchdb-load": "^1.4.0",
     "pretender": "~0.10.0"
+  },
+  "devDependencies": {
+    "timekeeper": "^1.0.0"
   }
 }

ember-cli-build.js

@@ -31,5 +31,10 @@ module.exports = function(defaults) {
   app.import('bower_components/pikaday/css/pikaday.css');
   app.import('vendor/octicons/octicons/octicons.css');
   app.import('bower_components/pouchdb-load/dist/pouchdb.load.js');
+
+  if (EmberApp.env() === 'test') {
+    app.import('bower_components/timekeeper/lib/timekeeper.js', { test: true });
+  }
+
   return app.toTree();
 };

tests/unit/mixins/dob-days-test.js

@@ -0,0 +1,72 @@
+import DOBDays from 'hospitalrun/mixins/dob-days';
+import { moduleFor, test } from 'ember-qunit';
+import Ember from 'ember';
+import DS from 'ember-data';
+import tHelper from 'ember-i18n/helper';
+import localeConfig from 'ember-i18n/config/en';
+
+moduleFor('mixin:dob-days', 'Unit | Mixin | dob-days', {
+  needs: [
+    'service:i18n',
+    'locale:en/translations',
+    'locale:en/config',
+    'util:i18n/missing-message',
+    'util:i18n/compile-template',
+    'config:environment'
+  ],
+  beforeEach() {
+    // set the locale and the config
+    this.container.lookup('service:i18n').set('locale', 'en');
+    this.registry.register('locale:en/config', localeConfig);
+
+    // Inject i18n as the intializer does not run in unit test
+    Ember.getOwner(this).inject('model', 'i18n', 'service:i18n');
+
+    // register t helper
+    this.registry.register('helper:t', tHelper);
+
+    // eslint-disable-next-line no-undef
+    timekeeper.freeze(new Date(1481784419830));
+  },
+  afterEach() {
+    // eslint-disable-next-line no-undef
+    timekeeper.reset();
+  },
+  subject(attrs) {
+    let subject;
+    Ember.run(() => {
+      let Test = DS.Model.extend(DOBDays);
+      this.register('model:test', Test);
+      subject = this.store().createRecord('test', attrs);
+    });
+
+    return subject;
+  },
+  store() {
+    return this.container.lookup('service:store');
+  }
+});
+
+test('convertDOBToText', function(assert) {
+  let dobDays = this.subject();
+
+  assert.strictEqual(dobDays.convertDOBToText(new Date(789109200000)).toString(), '21 years 11 months 12 days');
+});
+
+test('convertDOBToText date string', function(assert) {
+  let dobDays = this.subject();
+
+  assert.strictEqual(dobDays.convertDOBToText('January 3rd, 1995').toString(), '21 years 8 months 26 days');
+});
+
+test('convertDOBToText date string short format', function(assert) {
+  let dobDays = this.subject();
+
+  assert.strictEqual(dobDays.convertDOBToText('January 3rd, 1995', true).toString(), '21y 8m 26d');
+});
+
+test('convertDOBToText date string omit days', function(assert) {
+  let dobDays = this.subject();
+
+  assert.strictEqual(dobDays.convertDOBToText('January 3rd, 1995', false, true).toString(), '21 years 8 months');
+});