如何在javascript中模拟对象及其方法

Question

我在单元测试javascript函数listEntities时遇到了问题。难点在于mocking/stubbing。javascript模拟/存根库的文档一团糟。我希望有经验的人能给我指路。代码如下：

export const listEntities = (kind, googleDatastoreFactory) => {
  const datastore = googleDatastoreWrapperFactory();
  const query = datastore.createQuery(kind);
  return datastore.runQuery(query)
    .then(results => (results[0]));
};

export const googleDatastoreFactory = () => { 
    const Datastore = require('@google-cloud/datastore');
    return Datastore();
};

这是我的尝试：

describe('datastore api', () => {
  describe('listEntities', () => {
    const mockedGoogleDatastore = JsMockito.mock(GoogleDatastore);
    JsMockito.when(mockedGoogleDatastore).runQuery('query').thenReturn(new Promise(resolve => resolve(['result'])));
    JsMockito.when(mockedGoogleDatastore).createQuery('Test').thenReturn('query');
    const googleDatastoreFactory = () => (mockedGoogleDatastore);
    test('should return list of items', () => {
      listEntities('Test', googleDatastoreFactory).then(result => console.log(result));
    });
  });
});

下面是我的错误：

  ● datastore api › listEntities › encountered a declaration exception

    TypeError: _jsmockito2.default.mock is not a function

      at Suite.<anonymous> (app/api/datastore.api.test.js:7:60)
      at Suite.<anonymous> (app/api/datastore.api.test.js:6:3)
      at Object.<anonymous> (app/api/datastore.api.test.js:5:1)
          at Generator.next (<anonymous>)
          at Promise (<anonymous>)
          at Generator.next (<anonymous>)
          at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:188:7)

Answer 1

我最终没有使用一个模仿库/框架。我刚刚创建了一个哑类。