res.links.js

var express = require('..');
var request = require('supertest');

describe('res', function(){
  describe('.links(obj)', function(){
    it('should set Link header field', function (done) {
      var app = express();

      app.use(function (req, res) {
        res.links({
          next: 'http://api.example.com/users?page=2',
          last: 'http://api.example.com/users?page=5'
        });
        res.end();
      });

      request(app)
      .get('/')
      .expect('Link', '<http://api.example.com/users?page=2>; rel="next", <http://api.example.com/users?page=5>; rel="last"')
      .expect(200, done);
    })

    it('should set Link header field for multiple calls', function (done) {
      var app = express();

      app.use(function (req, res) {
        res.links({
          next: 'http://api.example.com/users?page=2',
          last: 'http://api.example.com/users?page=5'
        });

        res.links({
          prev: 'http://api.example.com/users?page=1'
        });

        res.end();
      });

      request(app)
      .get('/')
      .expect('Link', '<http://api.example.com/users?page=2>; rel="next", <http://api.example.com/users?page=5>; rel="last", <http://api.example.com/users?page=1>; rel="prev"')
      .expect(200, done);
    })
      it('should set Link header field with an Array', function (done) {
          var app = express();

          app.use(function (req, res) {
              res.links([
                  {
                      href: 'http://api.example.com/users?page=2',
                      rel: 'next',
                      title: 'next chapter',
                      type: 'text/plain;charset=UTF-8'
                  },
                  {
                      href: 'http://api.example.com/users?page=5',
                      rel: 'last',
                      title: 'the grand finale',
                      type: 'video/webm'
                  }
              ]);

              res.end();
          });

          request(app)
              .get('/')
              .expect('Link', '<http://api.example.com/users?page=2>; rel="next"; title="next chapter"; type="text/plain;charset=UTF-8",'
                            + ' <http://api.example.com/users?page=5>; rel="last"; title="the grand finale"; type="video/webm"')
              .expect(200, done);
      })
  })
})