elasticsearch - 没有setTimeout的Elasticsearch后端测试失败

Question

我正在为使用MongoDB和Elasticsearch的后端编写测试。问题在于，如果不使用setTimeout进行包装测试，测试将失败，并且似乎Elasticsearch在测试之前无法将模拟数据索引到db中。这是代码:

let elasticSearch = require('elasticsearch');
let elasticClient = new elasticSearch.Client({
  host: 'localhost:9200'
});
let app = require('./dist/app'); //path to my application
let supertest = require('supertest');

before((done) => {
  elasticClient.index(elasticMockData, function() {
    done();
  });
});

beforeEach(() => {
  request = supertest(app);
});

it('should get data from elastic', () => {
  setTimeout(() => { // if I comment this timeout, test will fail
    request.get('/api/elastic')
           .end((err, res) => {
             expect(res.body.hits.hits.length).not.to.equal(0);
           })
  }, 1000); // if I comment this timeout, test will fail
});

我想您会同意，超时不是一种优雅且不错的解决方案，它将每项测试的速度减慢到1秒或更长。也许我想念什么吗？

Answer 1

找到了解决方案，也许对某人有用。
根据Elasticsearch docs:

By default, the document will be available for get() actions immediately, but will only be available for searching after an index refresh (which can happen automatically or manually).

因此，在这种情况下，应在另一个回调函数中调用done():

before((done) => {
  elasticClient.index(elasticMockData, function() {
     elasticClient.indices.refresh(function (err: any, res: any) {
        if (err) {
          return;
        }
        done();
     });
  });
});