text: var test = require('./tape')
  var mongojs = require('../index')
  var db = mongojs('test', ['a', 'b'])
  
  test('optional callback', function (t) {
    db.a.ensureIndex({ hello: 'world' })
    setTimeout(function () {
      db.a.count(function () {
        db.close(t.end.bind(t))
      })
    }, 100)
  })
  