Mongoose 使用Mockgoose时保存并创建挂起

我试着用Mockgoose做测试。每当我在模型上调用

.save

或

.create

时，承诺都无法解决。我能够毫无问题地使用

.find

和

.findOne

。我不确定我是否设置了错误的东西，或者我是否误解了Mockgoose应该如何使用

我的测试设置为：

test/mockgoose.js

const mongoose = require('mongoose');
const { Mockgoose } = require('mockgoose');

const mockgoose = new Mockgoose(mongoose);

mockgoose.helper.setDbVersion('3.2.1');
mongoose.Promise = global.Promise;

module.exports = {
    mockgoose,
    mongoose
};

model.test.js

const { mongoose, mockgoose } = require('../test/mockgoose');
let Model = require('../model.js');
let conn;

describe('something', function() {
     before(() => {
        return mockgoose.prepareStorage().then(() => {
            mongoose.connect('mongodb://127.0.0.1:27017/testingDB');
            return new Promise(resolve => {
                mongoose.connection.once('connected', () => {
                    conn = mongoose.connection;
                    Model = Model(conn);
                    // we pass the connection into every model because we have several connections
                    resolve();
                });
            });
        });
    });

    after(() => {
        mongoose.disconnect();
    });

    it('should save', function() {

        const modelInstance = new Model({'name': 'model name'});
        /* modelInstance looks correct, 
        I have plugins adding additional fields 
        and those are being added correctly at this point */

        return modelInstance.save().then(newModel => {
            /* console.log is never hit and mocha timeouts
            if I console.log modelInstance.save() 
            I can see it is a pending promise. */

            console.log(newModel);
            assert.equal(newModel.additionalField, 'a', 'field is added '); 
        });
    });
});

---

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