text: 
  var express = require('../')
    , request = require('./support/http');
  
  describe('res', function(){
    describe('.set(field, value)', function(){
      it('should set the response header field', function(done){
        var app = express();
  
        app.use(function(req, res){
          res.set('Content-Type', 'text/x-foo').end();
        });
  
        request(app)
        .get('/')
        .end(function(res){
          res.headers.should.have.property('content-type', 'text/x-foo');
          done();
        })
      })
    })
    
    describe('.set(object)', function(){
      it('should set multiple fields', function(done){
        var app = express();
  
        app.use(function(req, res){
          res.set({
            'X-Foo': 'bar',
            'X-Bar': 'baz'
          }).end();
        });
  
        request(app)
        .get('/')
        .end(function(res){
          res.headers.should.have.property('x-foo', 'bar');
          res.headers.should.have.property('x-bar', 'baz');
          done();
        })
      })
    })
  })
  