Supertest issue

app.js

var express = require('express')
  , app = express()

app.configure(function() {
  app.use(express.bodyParser())
  app.use(app.router)
})

app.post('/', function(req, res) {
  res.send(200)
})

module.exports = app

npm-shrinkwrap.json

{
  "name": "supertest-issue",
  "version": "0.0.1",
  "dependencies": {
    "express": {
      "version": "3.0.0rc4",
      "dependencies": {
        "connect": {
          "version": "2.4.4",
          "dependencies": {
            "qs": {
              "version": "0.4.2"
            },
            "formidable": {
              "version": "1.0.11"
            },
            "bytes": {
              "version": "0.1.0"
            },
            "pause": {
              "version": "0.0.1"
            }
          }
        },
        "commander": {
          "version": "0.6.1"
        },
        "range-parser": {
          "version": "0.0.4"
        },
        "mkdirp": {
          "version": "0.3.3"
        },
        "cookie": {
          "version": "0.0.4"
        },
        "crc": {
          "version": "0.2.0"
        },
        "fresh": {
          "version": "0.1.0"
        },
        "methods": {
          "version": "0.0.1"
        },
        "send": {
          "version": "0.0.4",
          "dependencies": {
            "mime": {
              "version": "1.2.6"
            }
          }
        },
        "debug": {
          "version": "0.7.0"
        }
      }
    },
    "mocha": {
      "version": "1.4.2",
      "dependencies": {
        "commander": {
          "version": "0.6.1"
        },
        "growl": {
          "version": "1.5.1"
        },
        "jade": {
          "version": "0.26.3",
          "dependencies": {
            "mkdirp": {
              "version": "0.3.0"
            }
          }
        },
        "diff": {
          "version": "1.0.2"
        },
        "debug": {
          "version": "0.7.0"
        },
        "mkdirp": {
          "version": "0.3.3"
        }
      }
    },
    "supertest": {
      "version": "0.2.0",
      "dependencies": {
        "superagent": {
          "version": "0.9.0",
          "dependencies": {
            "qs": {
              "version": "0.4.2"
            },
            "formidable": {
              "version": "1.0.9"
            },
            "mime": {
              "version": "1.2.5"
            },
            "emitter-component": {
              "version": "0.0.1"
            },
            "cookiejar": {
              "version": "1.3.0"
            }
          }
        },
        "methods": {
          "version": "0.0.1"
        }
      }
    }
  }
}

package.json

{
  "name": "supertest-issue",
  "version": "0.0.1",
  "private": true,
  "dependencies": {
    "express": "3.x"
  },
  "devDependencies": {
    "mocha": "*",
    "supertest": "*"
  },
  "scripts": { "test": "mocha ./test.js" }
}

test.js

var request = require('supertest')
  , express = require('express')

var app = express()

describe('check status 201', function() {

  it('is not correct', function(done) {
    request(app)
      .post('/')
      .send({})
      .expect(201)
      .end(function(err, res) {
        done()
      })
  })

  it('is correct', function(done) {
    request(app)
      .post('/')
      .send({})
      .expect(201)
      .end(function(err, res) {
        if (err) throw error
        done()
      })
  })

})