CODEWITHSUNDEEP
node.jssinon
Priyanka Ware
Priyanka Ware

Reputation: 1

Use sinon stub for request constructor

I have implement node js code to call HTTP API's using request module. For get, post, put, delete, I have directly called request() of require module,

var sendRequest = function(req, callback) {
    request(req, function(err, res) {
        if (err) {
            callback(err, null, res);
        } else {
            callback(null, res);
        }
    }
}

I want to invoke sendRequest() but mock the response of request(). Any pointers for this.

Upvotes: 0

Views: 662

Answers (2)

Boris Z.
Boris Z.

Reputation: 21

One way to get it stubbed without anything but sinon, is to stub the inner class of Request, which conveniently offers its prototype, like this

stub = sinon.stub(request.Request.prototype, "init");
stub.callsFake( options => options.callback(null, {statusCode: 200}, "faked response"));

Where options in the callsFake are processed by the request function and the passed into the Request.prototype.init.

Now your callback parameters, are the ones expected in your var sendRequest = function(req, callback) {...} function

Upvotes: 2

Vasyl Boroviak
Vasyl Boroviak

Reputation: 6128

One of the many options is to use proxyquire to stub the request module:

var proxyquire = require('proxyquire')
  , assert = require('assert')
  , requestStub = function (req, callback) { callback(req); };

// assuming you export the sendRequest from that file
var sendRequest = proxyquire('./sendRequest', { 'request': pathStub });

describe('sendRequest', function() {
    it('request', function (done) {
        var someReq = {a: 'b'};
        sendRequest(someReq, function (req) {
            assert.equal(someReq, req);
            done();
        });
    });
});

Upvotes: 0

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