gistfile1.js

var dbURI    = 'mongodb://localhost/noClear-example'
  , mongoose = require('mongoose')
  , clearDB  = require('mocha-mongoose')(dbURI, { noClear: true })
  , expect   = require('chai').expect
;

var User = mongoose.model('User', new mongoose.Schema({
  name: {type: String },
  email: {type: String },
  username: {type: String }
}));

var testUser = new User({
  name: "Warner Onstine",
  email: "[email protected]",
  phone: "520-555-5555",
  username: "warneronstine",
  password: 'password test'
});

describe("Users", function(){
  before(function(done) {
    // this needs to be passed to the module at require time, up above
    //options = {noClear: true};

    if (mongoose.connection.db) return done();
    mongoose.connect(dbURI, function(){
      // use mocha-mongoose to clear the DB once at the start of the test
      clearDB(done);
    });
  });


  it("creates a new user", function(done){

    testUser.save(function(err, doc){
      if(err) return done(err);
      expect(doc).to.exist;
      expect(doc.name).to.equal("Warner Onstine");
      done();
    });
  });

  it("finds a user by email", function(done) {
    testUser.save(function(err, doc){
      if(err) return done(err);


      expect(doc.email).to.equal("[email protected]");
      var userQuery = User.findOne({'email': '[email protected]'});

      userQuery.exec(function (err, user){
        if(err) return done(err);
        expect(user).to.exist;
        expect(user.name).to.equal("Warner Onstine");
        done();
      });
    });

  });
  it("finds a user by username", function(done) {
    var userQuery = User.findOne({'username': 'warneronstine'});

    userQuery.exec(function (err, user){
      if(err) throw err;
      expect(user).to.exist;
      expect(user.name).to.equal("Warner Onstine");
      done();
    });
  });
});

package.json

{
  "dependencies": {
    "mongoose": "~3.6.5"
  },
  "devDependencies": {
    "mocha": "~1.9.0",
    "chai": "~1.5.0",
    "mocha-mongoose": "~0.1.4"
  }
}