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A Jest package for mocking mongoose models
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README.md

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A Jest package for mocking mongoose models

Installation

$ npm i mockingoose -D

Import the library

// using commonJS
const mockingoose = require('mockingoose').default;

// using es201x
import mockingoose from 'mockingoose';

Usage

// user.js
import mongoose from 'mongoose';
const { Schema } = mongoose;

const schema = Schema({
  name: String,
  email: String,
  created: { type: Date, default: Date.now },
});

export default mongoose.model('User', schema);

mockingoose(Model).toReturn(obj, operation = 'find')

Returns a plain object.

// __tests__/user.test.js
import mockingoose from 'mockingoose';

import model from './user';

describe('test mongoose User model', () => {
  it('should return the doc with findById', () => {
    const _doc = {
      _id: '507f191e810c19729de860ea',
      name: 'name',
      email: 'name@email.com',
    };

    mockingoose(model).toReturn(_doc, 'findOne');

    return model.findById({ _id: '507f191e810c19729de860ea' }).then(doc => {
      expect(JSON.parse(JSON.stringify(doc))).toMatchObject(_doc);
    });
  });

  it('should return the doc with update', () => {
    const _doc = {
      _id: '507f191e810c19729de860ea',
      name: 'name',
      email: 'name@email.com',
    };

    mockingoose(model).toReturn(doc, 'update');

    return model
      .update({ name: 'changed' }) // this won't really change anything
      .where({ _id: '507f191e810c19729de860ea' })
      .then(doc => {
        expect(JSON.parse(JSON.stringify(doc))).toMatchObject(_doc);
      });
  });
});

mockingoose(Model).toReturn(fn, operation = 'find')

Allows passing a function in order to return the result.

You will be able to inspect the query using the parameter passed to the function. This will be either a Mongoose Query or Aggregate class, depending on your usage.

You can use snapshots to automatically test that the queries sent out are valid.

// __tests__/user.test.js
import mockingoose from 'mockingoose';
import model from './user';

describe('test mongoose User model', () => {
  it('should return the doc with findById', () => {
    const _doc = {
      _id: '507f191e810c19729de860ea',
      name: 'name',
      email: 'name@email.com',
    };
    const finderMock = query => {
      expect(query.getQuery()).toMatchSnapshot('findById query');

      if (query.getQuery()._id === '507f191e810c19729de860ea') {
        return _doc;
      }
    };

    mockingoose(model).toReturn(finderMock, 'findOne'); // findById is findOne

    return model.findById('507f191e810c19729de860ea').then(doc => {
      expect(JSON.parse(JSON.stringify(doc))).toMatchObject(_doc);
    });
  });
});

mockingoose(Model).reset(operation = undefined)

will reset Model mock, if pass an operation, will reset only this operation mock.

it('should reset model mock', () => {
  mockingoose(model).toReturn({ name: '1' });
  mockingoose(model).toReturn({ name: '2' }, 'save');

  mockingoose(model).reset(); // will reset all operations;
  mockingoose(model).reset('find'); // will reset only find operations;
});

you can also chain mockingoose#ModelName operations:

mockingoose(model)
  .toReturn({ name: 'name' })
  .toReturn({ name: 'a name too' }, 'findOne')
  .toReturn({ name: 'another name' }, 'save')
  .reset('find');

mockingoose.resetAll()

will reset all mocks.

beforeEach(() => {
  mockingoose.resetAll();
});

Operations available:

  • find - for find query
  • findOne - for findOne query
  • count - for count query (deprecated)
  • countDocuments for count query
  • estimatedDocumentCount for count collection documents
  • distinct - for distinct query
  • findOneAndUpdate - for findOneAndUpdate query
  • findOneAndRemove - for findOneAndRemove query
  • update - for update query
  • save - for create, and save documents Model.create() or Model.save() or doc.save()
  • remove - for remove query
  • deleteOne - for deleteOne query
  • deleteMany - for deleteMany query
  • aggregate - for aggregate framework

Notes

The library is built with Typescript and typings are included.

All operations work with exec, promise and callback.

  • if you are using Model.create and you don't pass a mock with mockingoose you'll receive the mongoose created doc (with ObjectId and transformations)

  • validations are working as expected.

  • the returned document is an instance of mongoose Model.

  • update operation returns original mocked object.

  • you can simulate Error by passing an Error to mockingoose:

    mockingoose(model).toReturn(new Error('My Error'), 'save');
    
    return model.create({ name: 'name', email: 'name@email.com' }).catch(err => {
      expect(err.message).toBe('My Error');
    });
  • you can mock .populate in your mocked result just be sure to change the Schema's path to appropriate type (eg: Object | Mixed):

    User.schema.path('foreignKey', Object);
    
    const doc = {
      email: 'test@mail.com',
      foreignKey: {
        _id: '5ca4af76384306089c1c30ba',
        name: 'test',
        value: 'test',
      },
      name: 'Name',
      saveCount: 1,
    };
      
    mockingoose(User).toReturn(doc);
      
    const result = await User.find();
      
    expect(result).toMatchObject(doc);
  • no connection is made to the database (mongoose.connect is jest.fn())

  • will work with node 6.4.x. tested with mongoose 4.x and jest 20.x.

  • check tests for more, feel free to fork and contribute.

Recent Changes:

  • mockingoose.ModelName is deprecated, mockingoose(Model) is the now the recommended usage, with Model being a Mongoose model class.

    Alternatively, you may pass a string with the model name.

  • mockingoose(Model).toReturn((query) => value) can now take also take a function as a parameter.

    The function is called with either a Query or Aggregate object from Mongoose, depending on the request. This allows tests to ensure that proper queries are sent out, and helps with regression testing.

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