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'use strict';
const start = require('./common');
const mongoose = start.mongoose;const Schema = mongoose.Schema;
describe('SchemaNumber', function() {  it('allows 0 with required: true and ref set (gh-11912)', async function() {    const schema = new Schema({ x: { type: Number, required: true, ref: 'Foo' } });
    await new Promise((resolve, reject) => {      schema.path('x').doValidate(0, err => {        if (err != null) {          return reject(err);        }        resolve();      });    });  });});