在没有 setTimeout 的情况下使用 elasticsearch 的后端测试失败

Back-end tests with elasticsearch fails without setTimeout

我正在为使用 MongoDB 和 Elasticsearch 的后端编写测试。问题是如果没有用 setTimeout 包装测试,测试就会失败,而且看起来 elasticsearch 无法在测试前将模拟数据索引到数据库中。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
});

我想你会同意超时不是一个优雅和好的解决方案,它将每个测试减慢到 1 秒或更长时间。也许,我错过了什么?

已找到解决方案,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,done() 应该在另一个回调函数中调用:

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