Setting expectations when making direct server calls with Protractor

account.js

it('should delete account successfully', function (done) {
    req.post({json: true, url: constants.apiHostname() + '/api/v1/login/', form: {username: generatedEmail, password: password}}, function(error, message, body) {
        var userId = body.user.id;
        expect(userId).not.toBe(null);

        req.del(constants.apiHostname() + '/api/v1/users/' + userId, done, function (error, message, body) {
            expect(userId).toBe(204);
            done();
        });
    });
});