app.param.js

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

describe('app', function(){
  describe('.param(fn)', function(){
    it('should map app.param(name, ...) logic', function(done){
      var app = express();

      app.param(function(name, regexp){
        if (Object.prototype.toString.call(regexp) == '[object RegExp]') { // See #1557
          return function(req, res, next, val){
            var captures;
            if (captures = regexp.exec(String(val))) {
              req.params[name] = captures[1];
              next();
            } else {
              next('route');
            }
          }
        }
      })

      app.param(':name', /^([a-zA-Z]+)$/);

      app.get('/user/:name', function(req, res){
        res.send(req.params.name);
      });

      request(app)
      .get('/user/tj')
      .end(function(err, res){
        res.text.should.equal('tj');
        request(app)
        .get('/user/123')
        .expect(404, done);
      });

    })
  })

  describe('.param(names, fn)', function(){
    it('should map the array', function(done){
      var app = express();

      app.param(['id', 'uid'], function(req, res, next, id){
        id = Number(id);
        if (isNaN(id)) return next('route');
        req.params.id = id;
        next();
      });

      app.get('/post/:id', function(req, res){
        var id = req.params.id;
        id.should.be.a.Number;
        res.send('' + id);
      });

      app.get('/user/:uid', function(req, res){
        var id = req.params.id;
        id.should.be.a.Number;
        res.send('' + id);
      });

      request(app)
      .get('/user/123')
      .end(function(err, res){
        res.text.should.equal('123');

        request(app)
        .get('/post/123')
        .expect('123', done);
      })
    })
  })

  describe('.param(name, fn)', function(){
    it('should map logic for a single param', function(done){
      var app = express();

      app.param('id', function(req, res, next, id){
        id = Number(id);
        if (isNaN(id)) return next('route');
        req.params.id = id;
        next();
      });

      app.get('/user/:id', function(req, res){
        var id = req.params.id;
        id.should.be.a.Number;
        res.send('' + id);
      });

      request(app)
      .get('/user/123')
      .expect('123', done);
    })
  })
})