(function(){
  /** 
   * Test code of db.listCollections
   * test_listCollections.js
   */  
  "use strict";
  var Mongo = require('mongodb');
  var MongoClient = Mongo.MongoClient;

  var url = 'mongodb://localhost:27017/testListCollections';

  MongoClient.connect(url, null, function(err, db){
    db.createCollection('test1', function(r){
      db.createCollection('test2', function(r){
        db.createCollection('test3', function(r){
          db.listCollections().toArray(console.log);
        }); 
      }); 
    }); 
  }); 
})();

$ rm -rf node_modules/mongodb/
$ npm install mongodb@2.0.14
mongodb@2.0.14 node_modules/mongodb
├── readable-stream@1.0.31 (isarray@0.0.1, inherits@2.0.1, string_decoder@0.10.31, core-util-is@1.0.1)
└── mongodb-core@1.1.9 (rimraf@2.2.6, mkdirp@0.5.0, kerberos@0.0.8, bson@0.2.18)
$ node test_listCollections.js 
null [ { name: 'system.indexes', options: {} },
  { name: 'test1', options: { flags: 1 } },
  { name: 'test2', options: { flags: 1 } },
  { name: 'test3', options: { flags: 1 } } ] 

$ rm -rf node_modules/mongodb/
$ npm install mongodb@2.0.15
mongodb@2.0.15 node_modules/mongodb
├── readable-stream@1.0.31 (isarray@0.0.1, string_decoder@0.10.31, inherits@2.0.1, core-util-is@1.0.1)
└── mongodb-core@1.1.11 (rimraf@2.2.6, mkdirp@0.5.0, kerberos@0.0.8, bson@0.2.18)
$ node test_listCollections.js
null [ { name: 'testListCollections.system.indexes', options: {} },
  { name: 'test1', options: { flags: 1 } },
  { name: 'test2', options: { flags: 1 } },
  { name: 'test3', options: { flags: 1 } } ]