describe('PersistedModel.createChangeStream()', function() {
  describe('configured to source changes locally', function() {
    before(function() {
      var test = this;
      var app = loopback({localRegistry: true});
      var ds = app.dataSource('ds', {connector: 'memory'});
      this.Score = app.model('Score', {
        dataSource: 'ds',
        changeDataSource: false // use only local observers
      });
    });

    it('should detect create', function(done) {
      var Score = this.Score;

      Score.createChangeStream(function(err, changes) {
        changes.on('data', function(change) {
          expect(change.type).to.equal('create');
          changes.destroy();
          done();
        });

        Score.create({team: 'foo'});
      });
    });

    it('should detect update', function(done) {
      var Score = this.Score;
      Score.create({team: 'foo'}, function(err, newScore) {
        Score.createChangeStream(function(err, changes) {
          changes.on('data', function(change) {
            expect(change.type).to.equal('update');
            changes.destroy();
            done();
          });
          newScore.updateAttributes({
            bat: 'baz'
          });
        });
      });
    });

    it('should detect delete', function(done) {
      var Score = this.Score;
      Score.create({team: 'foo'}, function(err, newScore) {
        Score.createChangeStream(function(err, changes) {
          changes.on('data', function(change) {
            expect(change.type).to.equal('remove');
            changes.destroy();
            done();
          });

          newScore.remove();
        });
      });
    });
  });

  // TODO(ritch) implement multi-server support
  describe.skip('configured to source changes using pubsub', function() {
    before(function() {
      var test = this;
      var app = loopback({localRegistry: true});
      var db = app.dataSource('ds', {connector: 'memory'});
      var ps = app.dataSource('ps', {
        host: 'localhost',
        port: '12345',
        connector: 'pubsub',
        pubsubAdapter: 'mqtt'
      });
      this.Score = app.model('Score', {
        dataSource: 'db',
        changeDataSource: 'ps'
      });
    });

    it('should detect a change', function(done) {
      var Score = this.Score;

      Score.createChangeStream(function(err, changes) {
        changes.on('data', function(change) {
          done();
        });
      });
    });
  });
});