`file` and `data` have no value... so that's why you get the
ReferenceError. Understanding why you're trying to stub the filesystem
method would help (i.e. - what other code are you trying to test that is
causing you to need to stub the fs), but from what I can tell given the
context here you can simplify this a lot.
.callsFake takes a function, so you can just do this:
const writeImageStub =
sinon
.stub(fs, 'writeFileSync')
.callsFake(() => '/static/images/image.jpg')
What you have is more of a mock than a stub, because you're returning
pre-configured data AND attempting to verify behavior as part of the fake.
I generally avoid mocks.
Also, you shouldn't need to verify/expect things as part of a core module
or even 3rd party modules. You should just verify the code *you* own. Does
that help?
On Friday, November 1, 2019 at 5:08:08 PM UTC-5, Lukas Wilkeer wrote:
>
> I'm attempt to stub the fs.writeFileSync method, but it's causing a
> Reference Error.
>
> In that case, oeverloading the fs method causes troubes as sinon.restore()
> doesn't work.
>
> *My stub.*
>
> const writeImageStub = sinon.stub(fs, 'writeFileSync')
> .callsFake((file, data, (err) => {
> expect(file).to.be.a('string')
> expect(getFileExtension(data)).to.equal('jpg')
> expect(new Buffer.alloc(data)).to.be.a('object')
>
> return '/static/images/image.jpg'
> }))
>
> *Reference error*: file is not defined.
>
> How to do this, what causing this and exist other method?
>
>
> *PS:*
> Spying the method causes the write operation to be executed, on this case
> i have to delete the files written, but how to get the filename as the
> format is *filename.Date.now.extension*. Don't exist a way to store as a
> global variable to do this.
>
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