运行与ember-i18n包相关的Ember验收测试时“缺少翻译”

我正在为Ember组件编写验收测试，允许用户通过 ember-select-list 包提供的下拉列表切换其i18n设置 . 我也在使用 ember-i18n 包进行i18n设置 . 下拉组件如下所示：

import Ember from 'ember';

export default Ember.Component.extend({
  i18n: Ember.inject.service(),
  languagePreference: Ember.inject.service(),

  classNames: ['language-dropdown'],

  languageOptions: Ember.computed('i18n.locale', function() {
    let i18n = this.get('i18n');
    return i18n.get('locales').map((item) => {
      return {
        id: item,
        name: i18n.t(`languages.${item}`)
      };
    });
  }),

  onFinish: null,

  actions: {
    selectLanguage(i18n) {
      this.get('languagePreference').setUserI18nPreference(i18n);
      this.get('onFinish')();
    }
  }

});

language-preference 服务如下所示：

import Ember from 'ember';

export default Ember.Service.extend({

  i18n: Ember.inject.service(),
  config: Ember.inject.service(),

  setSessionI18nPreference() {
    let setSessionI18n = (results) => {
      let { preferences, userName } = results;
      if (userName && preferences[userName]) {
        this.set('i18n.locale', preferences[userName].i18n);
      }
    };
    this._fetchUserPreferencesDB().then(setSessionI18n);
  },

  setUserI18nPreference(i18n) {
    let setUserI18n = (results) => {
      let { preferences, userName } = results;
      if (preferences[userName] === undefined) {
        preferences[userName] = {};
      }
      preferences[userName].i18n = i18n;
      this.get('config.configDB').put(preferences);
      this.set('i18n.locale', i18n);
    };
    this._fetchUserPreferencesDB().then(setUserI18n);
  },

  _fetchUserPreferencesDB() {
    let configDB = this.get('config.configDB');
    let userName;
    return configDB.get('current_user').then((user) => {
      userName = this._fetchUsername(user);
      let preferences = configDB.get('preferences');
      return Ember.RSVP.hash({ userName, preferences });
    }).catch((err) => {
      console.log(err);
      if (err.status === 404) {
        this._initPreferencesDB(userName, 'en');
      }
    });
  },

  _fetchUsername(user) {
    switch (typeof user.value) {
      case 'string':
        return user.value;
      case 'object':
        return user.value.name;
      default:
        return undefined;
    }
  },

  _initPreferencesDB(username, i18n) {
    let doc = {
      _id: 'preferences'
    };
    if (username != undefined) {
      doc[username] = {
        i18n: i18n || 'en'
      };
    }
    this.get('config.configDB').put(doc);
  }
});

对于验收测试，到目前为止我所拥有的是：

import Ember from 'ember';
import { module, test } from 'qunit';
import startApp from 'hospitalrun/tests/helpers/start-app';

module('Acceptance | language dropdown', {
  beforeEach() {
    this.application = startApp();
  },

  afterEach() {
    Ember.run(this.application, 'destroy');
  }
});

test('setting a language preference persists after logout', (assert) => {
  runWithPouchDump('default', () => {
  authenticateUser({ name: 'foobar', prefix: 'p2' });
  visit('/');

  andThen(() => {
    assert.equal(currentURL(), '/');
    assert.equal(find('.view-current-title').text(), 'Welcome to HospitalRun!');
    });
    andThen(() => {
      click('a.settings-trigger');
      waitToAppear('.settings-nav');
      // andThen(() => {
      //   select('.language-dropdown', 'French');
      //   andThen(() => {
      //     debugger;
      //   });
      // });
    });
  });
});

这很好，我的所有测试都通过了 . 但是，当我取消注释当前已注释掉的块并重新运行测试时，我看到多个测试失败，从全局错误开始：

not ok 66 PhantomJS 2.1 - Global error: Error: Missing translation: navigation.subnav.textReplacements at http://localhost:7357/assets/tests.js, line 12058
---
    Log: |
        { type: 'error',
          text: 'Error: Missing translation: navigation.subnav.textReplacements at http://localhost:7357/assets/tests.js, line 12058\n' }
...
not ok 67 PhantomJS 2.1 - Acceptance | language dropdown: setting a language preference persists after logout
---
    actual: >
        null
    expected: >
        null
    stack: >
        http://localhost:7357/assets/tests.js:12058
    message: >
        Error: Missing translation: navigation.subnav.textReplacements
    Log: |
...

该应用程序在我的浏览器中正常工作（翻译文件全部到位，我可以在切换i18n时在浏览器中看到正确的i18n输出） . ember-i18n 文档说它应该可以正常使用调用 startApp() 的测试，这个测试就是这样 . 什么's weird to me is that the commented-out line, when uncommented, breaks not just this test but tests in other files too. I'猜测它's affecting some global (within the test process) i18n setting, and this setting is not getting torn down after this test finishes, but I can'确定 .

代码住在这里 - https://github.com/richiethomas/hospitalrun-frontend/tree/debug

最新的提交代表了失败的测试 .

编辑：当我将调试器放在 language-preference 内的 _fetchUserPreferencesDB 函数中时，我可以调用 this.get('i18n.locales') 并查看我期望的语言环境，因此我知道原因不同于不同环境中的语言环境（即 development vs test ） . 我甚至打电话给 this.get('i18n').t('navigation.subnav.textReplacements') ，这与失败的测试所说的翻译 Value 相同，我得到了正确的翻译 . 所以我真的不确定测试失败的原因 .