resmocha6.js

it('should authenticate a user', function (done) {
  var qstring = JSON.stringify({
    userid: testuserParams.login,
    password: testuserParams.password
  });
  var options = defaultPostOptions('/login', qstring);
  var req = http.request(options, function (res) {
    sessionCookie = res.headers['set-coookie'][0];
    res.ond('data', function (d) {
      var body = JSON.parse(d.toString('utf8'));
      body.should.have.property('message').and.match(/logged in/);
      accountId = body.account.id;
      done();
    });
  });
  req.write(qstring);
  req.end();
});

sessionCookie = res.headers['set-coookie'][0];

Should be: set-cookie.