Nodejs, moch/chai failing with "Segmentation fault: 11" on macOS

I am running mocha/chai (3.2.0/3.5.0) based test cases for my nodejs (6.10.2) based application, on macOS 10.12.4, and I am running into a "Segmentation fault: 11" failure.

So far I have tried:

• Erasing my node_modules folder and doing a new npm install
• Checking for outdated dependencies and upgrading them
• Upgrading the nodejs version (was using 6.7.0), via sudo port upgrade nodejs6

The code that is failing for me is as follows.

    chai.request(url)
        .post(`/api/filestore?token=${token}`)
        .timeout(20000)
        .attach('file', fs.readFileSync(filepath), filename)
        .field('name', data.name)
        .field('description', data.description)
        .field('keywords', data.keywords)
        .end(function(err, res) {
            if (err) { done(err); }
            res.should.have.status(200);
            res.should.be.json;
            res.body.should.have.property('name');
            res.body.should.have.property('description');
            res.body.should.have.property('categories');
            res.body.keywords.should.be.a('array');
            res.body.keywords.join(',').should.be.equal(data.keywords);
            done();
        });

The segmentation fault disappears when I remove the 'attach' line:

.attach('file', fs.readFileSync(filepath), filename)

I have tried the fs.readFileSync(filepath) separately and I don't encounter the issue.

This wasn't an issue in the past and only became an issue recently. I am wondering whether it coincides with the upgrade of the OS, but I can't be sure.

Does anyone have any suggestions?

via Andre M