test.js

var async = require('async'),
should = require('chai').should(),
mongoose = require('mongoose'),
autoIncrement = require('..'),
connection;

before(function (done) {
  connection = mongoose.createConnection('mongodb://127.0.0.1/mongoose-auto-increment-test');
  connection.on('error', console.error.bind(console));
  connection.once('open', function () {
    autoIncrement.initialize(connection, mongoose);
    done();
  });
});

after(function (done) {
  connection.db.dropDatabase(function (err) {
    if (err) return done(err);
    connection.close(done);
  });
});

afterEach(function (done) {
  connection.model('User').collection.drop(function () {
    delete connection.models.User;
    connection.model('IdentityCounter').collection.drop(done);
  });
});

describe('mongoose-auto-increment', function () {

  it('should increment the _id field on save', function (done) {

    // Arrange
    var userSchema = new mongoose.Schema({
      name: String,
      dept: String
    });
    userSchema.plugin(autoIncrement.plugin, 'User');
    var User = connection.model('User', userSchema),
    user1 = new User({ name: 'Charlie', dept: 'Support' }),
    user2 = new User({ name: 'Charlene', dept: 'Marketing' });

    // Act
    async.series({
      user1: function (cb) {
        user1.save(cb);
      },
      user2: function (cb) {
        user2.save(cb);
      }
    }, assert);

    // Assert
    function assert(err, results) {
      should.not.exist(err);
      results.user1[0].should.have.property('_id', 0);
      results.user2[0].should.have.property('_id', 1);
      done();
    }

  });

  it('should increment the specified field instead (Test 2)', function(done) {

    // Arrange
    var userSchema = new mongoose.Schema({
      name: String,
      dept: String
    });
    userSchema.plugin(autoIncrement.plugin, { model: 'User', field: 'userId' });
    var User = connection.model('User', userSchema),
    user1 = new User({ name: 'Charlie', dept: 'Support' }),
    user2 = new User({ name: 'Charlene', dept: 'Marketing' });

    // Act
    async.series({
      user1: function (cb) {
        user1.save(cb);
      },
      user2: function (cb) {
        user2.save(cb);
      }
    }, assert);

    // Assert
    function assert(err, results) {
      should.not.exist(err);
      results.user1[0].should.have.property('userId', 0);
      results.user2[0].should.have.property('userId', 1);
      done();
    }

  });


  it('should start counting at specified number (Test 3)', function (done) {

    // Arrange
    var userSchema = new mongoose.Schema({
      name: String,
      dept: String
    });
    userSchema.plugin(autoIncrement.plugin, { model: 'User', startAt: 3 });
    var User = connection.model('User', userSchema),
    user1 = new User({ name: 'Charlie', dept: 'Support' }),
    user2 = new User({ name: 'Charlene', dept: 'Marketing' });

    // Act
    async.series({
      user1: function (cb) {
        user1.save(cb);
      },
      user2: function (cb) {
        user2.save(cb);
      }
    }, assert);

    // Assert
    function assert(err, results) {
      should.not.exist(err);
      results.user1[0].should.have.property('_id', 3);
      results.user2[0].should.have.property('_id', 4);
      done();
    }

  });

  it('should increment by the specified amount (Test 4)', function (done) {

    // Arrange
    var userSchema = new mongoose.Schema({
      name: String,
      dept: String
    });
    userSchema.plugin(autoIncrement.plugin, { model: 'User', incrementBy: 5 });
    var User = connection.model('User', userSchema),
    user1 = new User({ name: 'Charlie', dept: 'Support' }),
    user2 = new User({ name: 'Charlene', dept: 'Marketing' });

    // Act
    async.series({
      user1: function (cb) {
        user1.save(cb);
      },
      user2: function (cb) {
        user2.save(cb);
      }
    }, assert);


    // Assert
    function assert(err, results) {
      should.not.exist(err);
      results.user1[0].should.have.property('_id', 0);
      results.user2[0].should.have.property('_id', 5);
      done();
    }

  });

  describe('helper function', function () {

    it('resetCount should cause the count to reset as if there were no documents yet.', function (done) {

      // Arrange
      var userSchema = new mongoose.Schema({
        name: String,
        dept: String
      });
      userSchema.plugin(autoIncrement.plugin, 'User');
      var User = connection.model('User', userSchema),
      user = new User({name: 'Charlie', dept: 'Support'});

      // Act
      async.series({
        user: function (cb) {
          user.save(cb);
        },
        reset: function (cb) {
          user.resetCount(cb);
        },
      }, assert);

      // Assert
      function assert(err, results) {
        should.not.exist(err);
        results.user[0].should.have.property('_id', 0);
        results.reset.should.equal(0);
        done();
      }

    });

  });
});