Tips for efficiently populating a MongoDB database for end-to-end testing

After following the setup process outlined in this guide: https://medium.com/developer-circles-lusaka/how-to-write-an-express-js-server-using-test-driven-development-921dc55aec07, I have configured my environments accordingly.

Utilizing the config package, I am able to select the desired environment for my tasks.

One task I am looking to accomplish is populating the database before each test runs. It seems feasible to achieve this using Mocha's beforeEach() hook since I am utilizing Mocha as my test runner.

My inquiry pertains to an effective method of loading a bulk amount of data into the database simultaneously (I am working with Mongoose). Is there a preferred way to do this without the need to specify Mongoose during insertion? Additionally, I am aiming to store and execute this process in a separate file from the actual tests.

javascriptmongodbexpressmocha.jse2e-testing

Answer №1

To streamline my testing process, I begin by completely dropping the database in the beforeEach function. By accessing the mongodb instance on my mongoose connection, I use db.db.dropDatabase().

I then create preconfigured data objects specific to my domain and store them in a module that I can easily import - these are simple JavaScript objects like data.users.vader, data.users.luke, or data.products.deathStar.

During my tests, I utilize chaihttp to interact with routes using the predefined data, such as:

let user = data.users.vader;
chai.request(server)
                    .post('/users')
                    .send(user)
                    .end((err, result) => {
                        if (err) {
                            return callback(err);
                        }

result.should.have.status(200);
                        result.body.status.should.eq(enums.status.success);
                        result.body.data._id.should.be.a('string');
                        result.body.data.name.should.eq(user.name);
                        result.body.data.email.should.eq(user.email);

For every unit test, I reset the database and set up the necessary data from scratch. This ensures that each test is independent of the others.

If needed, you can also load data in bulk using mongodb’s batchWriteItem method at a later stage.

Additionally, I create functions that can be called within the unit tests for loading data efficiently using batchWriteItem. This feature comes in handy especially for performance testing queries and similar tasks.

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