test nodejs - mongodb

gistfile1.js

var MongoClient = require('mongodb').MongoClient;

// Some docs for insertion
var docs = [{
  type: 'switch',
  duration:0
},{
  type: 'switch',
  duration:0
},{
  type: 'switch',
  duration:0
},{
  type: 'switch',
  duration:0
},{
  type: 'switch',
  duration:0
},{
  type: 'switch',
  duration:1
},{
  type: 'switch',
  duration:1
},{
  type: 'switch',
  duration:2
},{
  type: 'switch',
  duration:5
}];

MongoClient.connect("mongodb://localhost:27017/exampleDb", function(err, db) {
  // Create a collection
  db.createCollection('test', function(err, collection) {

    collection.drop(function(err, result){
    // Insert the docs
    collection.insert(docs, {safe:true}, function(err, result) {

      collection.count(function(err, results) {
          console.log("count",results);


          collection.group(
            {type:1, duration:1},
            {},
            {"count":0},
            function(obj, prev){
              prev.count++;
            },
            function(err, result){
              console.log("group",result);
              db.close();
            }
          );

        });
      });
    });
  });
});