express/test/res.format.js

var express = require('../')
  , request = require('./support/http')
  , utils = require('../lib/utils')
  , assert = require('assert');

var app = express();

app.use(function(req, res, next){
  res.format({
    'text/plain': function(){
      res.send('hey');
    },

    'text/html': function(){
      res.send('<p>hey</p>');
    },
  
    'application/json': function(a, b, c){
      assert(req == a);
      assert(res == b);
      assert(next == c);
      res.send({ message: 'hey' });
    }
  });
});

app.use(function(err, req, res, next){
  res.send(406, 'Supports: ' + err.types.join(', '));
})

describe('req', function(){
  describe('.format(obj)', function(){
    it('should utilize qvalues in negotiation', function(done){
      request(app)
      .get('/')
      .set('Accept', 'text/html; q=.5, application/json, */*; q=.1')
      .expect('{"message":"hey"}', done);
    })

    it('should allow wildcard type/subtypes', function(done){
      request(app)
      .get('/')
      .set('Accept', 'text/html; q=.5, application/*, */*; q=.1')
      .expect('{"message":"hey"}', done);
    })

    it('should default the Content-Type', function(done){
      request(app)
      .get('/')
      .set('Accept', 'text/html; q=.5, text/plain')
      .end(function(res){
        res.headers['content-type'].should.equal('text/plain');
        res.body.should.equal('hey');
        done();
      });
    })

    describe('when Accept is not present', function(){
      it('should invoke the first callback', function(done){
        request(app)
        .get('/')
        .expect('hey', done);
      })
    })

    describe('when no match is made', function(){
      it('should should respond with 406 not acceptable', function(done){
        request(app)
        .get('/')
        .set('Accept', 'foo/bar')
        .end(function(res){
          res.should.have.status(406);
          res.body.should.equal('Supports: text/plain, text/html, application/json');
          done();
        });
      })
    })
  })
})