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/** * Module dependencies. */
'use strict';
const start = require('./common');
const assert = require('assert');
const mongoose = start.mongoose;const Schema = mongoose.Schema;
/** * Test. */
describe('types.subdocument', function() {  let GrandChildSchema;  let ChildSchema;  let ParentSchema;  let db;
  before(function() {    GrandChildSchema = new Schema({      name: String    });
    ChildSchema = new Schema({      name: String,      child: GrandChildSchema    });
    ParentSchema = new Schema({      name: String,      children: [ChildSchema]    });
    mongoose.model('Parent-3589-Sub', ParentSchema);    db = start();  });
  after(async function() {    await db.close();  });
  it('returns a proper ownerDocument (gh-3589)', function() {    const Parent = mongoose.model('Parent-3589-Sub');    const p = new Parent({      name: 'Parent Parentson',      children: [        {          name: 'Child Parentson',          child: {            name: 'GrandChild Parentson'          }        }      ]    });
    assert.equal(p._id, p.children[0].child.ownerDocument()._id);  });
  it('not setting timestamps in subdocuments', function() {    const Thing = db.model('Test', new Schema({      subArray: [{        testString: String      }]    }, {      timestamps: true    }));
    const thingy = new Thing({      subArray: [{        testString: 'Test 1'      }]    });    let id;    return thingy.save().      then(function() {        id = thingy._id;      }).      then(function() {        const thingy2 = {          subArray: [{            testString: 'Test 2'          }]        };        return Thing.updateOne({          _id: id        }, { $set: thingy2 });      });  });
  describe('#isModified', function() {    it('defers to parent isModified (gh-8223)', function() {      const childSchema = Schema({ id: Number, text: String });      const parentSchema = Schema({ child: childSchema });      const Model = db.model('Test1', parentSchema);
      const doc = new Model({ child: { text: 'foo' } });      assert.ok(doc.isModified('child.id'));      assert.ok(doc.child.isModified('id'));    });  });});