node-jsonwebtoken/test/async_sign.tests.js

var jwt = require('../index');
var expect = require('chai').expect;

describe('signing a token asynchronously', function() {

  describe('when signing a token', function() {
    var secret = 'shhhhhh';

    it('should return the same result as singing synchronously', function(done) {
      jwt.sign({ foo: 'bar' }, secret, { algorithm: 'HS256' }, function (err, asyncToken) {
        if (err) return done(err);
        var syncToken = jwt.sign({ foo: 'bar' }, secret, { algorithm: 'HS256' });
        expect(asyncToken).to.be.a('string');
        expect(asyncToken.split('.')).to.have.length(3);
        expect(asyncToken).to.equal(syncToken);
        done();
      });
    });

    it('should throw error', function(done) {
      //this throw an error because the secret is not a cert and RS256 requires a cert.
      jwt.sign({ foo: 'bar' }, secret, { algorithm: 'RS256' }, function (err) {
        expect(err).to.be.ok();
        done();
      });
    });
  });
});