clean-mongo

Here's the deal. You're running tests, and you want a clean slate on your MongoDB test database.

clean-mongo will open a MongoDB connection, and will destroy all data, giving you a fresh, clean database. Ready to use for tests.

Installation

npm install --save clean-mongo

Usage

Use the cleanMongo function by passing it the database connection URL, in the same way as the native mongodb driver's MongoClient constructor.

The cleanMongo function returns a Promise for the database connection instance.

var cleanMongo = require('clean-mongo');

cleanMongo('mongodb://localhost/my-test-database').then(function(db) {

  // Here's your fresh db instance, ready to run.
  console.log(db.databaseName) // 'my-test-database'

  db.collection('documents')...

})

Ava test example

I use ava for tests. Here's a quick way to use clean-mongo.

// Before each test, get a clean database.
test.beforeEach(t => {
  // Because we return this promise, ava will wait for it to resolve
  // before continuing to the tests.
  return cleanMongo('mongodb://localhost/my-test-database').then(db => {
    // We can use t.context to provide the db to our tests.
    t.context.db = db;
  });
});

// Use the database in a test.
test(t => {
  t.context.db.collection('documents').find({}).toArray().then(results => {
    t.is(results.length, 0); // It should be empty!
  });
});