I am using elasticsearch and would like to write a unit test for the following code:
import * as elasticsearch from "elasticsearch";
import config from "../config";
const client = new elasticsearch.Client({
host: config.elasticsearch.host,
log: "trace"
});
export function index(data) {
return new Promise((resolve, reject) => {
client.create({
index: "myindex",
type: "mytype",
id: booking.urn,
body: data
}).then(resolve, reject);
});
}
I am familiar with mocha and sinon, however I don't know of a good pattern to use to stub\\mock client.create
in this case.
Can anyone suggest an approach that I could use?
One possible option is to use proxyquire
+ sinon
combo
Sinon will fake Client
:
const FakeClient = sinon.stub();
FakeClient.prototype.create = sinon.stub().returns("your data");
var fakeClient = new FakeClient();
console.log(fakeClient.create()); // -> "your data"
Such fake client can be passed into module under test by injection via proxyquire
:
import proxyquire from 'proxyquire';
const index = proxyquire('./your/index/module', {
'elasticsearch': { Client: FakeClient }
});
The answer of luboskrnac will works if you are trying to proxiquire module that doesn't wrap elasticsearch client, otherwise you need to proxiquire nested elasticsearch client.
// controller.spec.js
const FakeClient = {};
FakeClient.search = () => {};
sinon.stub(FakeClient, 'search').callsFake((params, cb) => cb(null, {
hits: {
hits: [{
_source: {
id: '95254ea9-a0bd-4c26-b5e2-3e9ef819571d',
},
}],
},
}));
controller = proxyquire('./controller', {
'../components/es.wrapper': FakeClient,
'@global': true,
});
wrapper
// components/es.wrapper.js
const elasticsearch = require('elasticsearch');
const client = new elasticsearch.Client({
host: process.env.ELASTICSEARCH_HOST,
});
const wrapper = (method, params, callback) => {
if (process.env.NODE_ENV === 'development') {
params.index = `dev_${params.index}`;
}
return client[method](params, callback);
};
// Wrap ES client methods with dev env prefix
module.exports = {
search: (params, callback) => {
return wrapper('search', params, callback);
},
}
controller
// controller.js
const es = require('../components/es.wrapper');
module.exports = {
search: (req, res, next) => {
....
es.search(...)
....
}
}
我成功使用https://www.npmjs.com/package/nock ,模拟了端口9200对elasticsearch主机的调用。
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