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'use strict';
const applyTimestampsToUpdate = require('../../lib/helpers/update/applyTimestampsToUpdate');const assert = require('assert');
describe('applyTimestampsToUpdate', function() {  it('handles update pipelines (gh-11151)', function() {    const update = [{ $set: { title: 'mongoose-with-aggregate-set' } }];    const now = new Date('2016-01-01');    const res = applyTimestampsToUpdate(now, 'created_at', 'updated_at', update, {});
    assert.equal(res.length, 2);    assert.equal(res[1].$set.updated_at.valueOf(), now.valueOf());  });});