node.js can't upload file in integration test

user_404201 0
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I'm adding integration tests to a legacy code-base prior to refactoring. For this case, uploading a file.

The Test:

it('uploads a photo at the specified index', done => {

    chai.request(server.instance)
        .post('/profile/photo/0')
        .set('Access-Token', `${token}`)
        .set('API-Key', testConfig.apiKey)
        .field({contentId: 'foobar'})
        .attach('file', fs.readFileSync(__dirname + '/logo.png'), 'file')
        .end((err, res) => {
            console.log(JSON.stringify(res.body))
            res.should.have.status(200)


            done()
        })
})

The endpoint being tested works ok in production. But to get the test to pass, I have to comment out the following lines in make-middleware.js of the multer module: 

if (!includeFile) {
  // appender.removePlaceholder(placeholder)
  // return fileStream.resume()
}

Being inexperienced with node, I must've missed some configuration or something. How can I make my test pass (without modifying an external module's code)?

multer node.js javascript
1 Answers

multer uses busboy to get its job done (get / stream files). The lines you've commented just stops the stream :

fileStream.resume() in this code is equivalent of stream.resume() in busboy code, so it just discards the stream :

(from busboy documentation) :

you should always handle the stream no matter if you care about the file contents or not (e.g. you can simply just do stream.resume(); if you want to discard the contents)

But Multer is not supposed to behave that way !

It only behave that way if you pass to Multer a custom fileFilter with a callback that sets includeFile to false.
Otherwise, if you don't have fileFilter option, Multer uses the following default fileFilter (that does nothing) : 

function allowAll (req, file, cb) {
  cb(null, true)
}

And as you can see, the second parameter of the callback is true, which is includeFile.

So, you can check your custom fileFilter if you have one and if you don't, it could be an unexpected side effect and I whish you good luck with it !

Hope it helps,
Best regards

user_47563040
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