Empty a Model's Collection With Mongoose

person.js

var mongoose = require("mongoose")
  , assert = require("assert")
  , async = require("async")
  , Person

async.series([
  function(callback){
    mongoose.connect("mongodb://localhost/mydb")
    mongoose.connection.on("open", callback)
  },

  function(callback){
    Person = mongoose.model("Person", new mongoose.Schema({
      name: String
      , age: Number
    }))
    callback()
  },

  function(callback){
    async.parallel([
      function(callback){
        (new Person({age: 21, name: "Travis"})).save(callback)
      },

      function(callback){
        (new Person({age: 131, name: "Pablo"})).save(callback)
      }
    ], callback)
  },

  function(callback){
    Person.find({}, function(err, docs) {
      assert.equal(2, docs.length)
      callback()
    })
  },

  function(callback){
    Person.collection.remove()
    callback()
  },

  function(callback){
    Person.find({}, function(err, docs) {
      assert.equal(0, docs.length)
      callback()
    })
  }
], function(callback){
})