In this chapter, we will explore practical examples and use cases that integrate the previously described tools and techniques. The examples will cover everything from unit tests to integration and end-to-end (E2E) tests, using Mocha, Chai, Sinon.js, Supertest, Cypress, and more. These examples are designed to provide you with a deeper and more applicable understanding of how to structure and execute tests in your Node.js projects.

Sample Project: Task Management Application

Suppose we have a task management application with endpoints to create, retrieve, update, and delete tasks. The models and routes are implemented in Node.js using Express, and the data is stored in a MongoDB database.

Project Structure

Unit Tests with Mocha, Chai, and Sinon.js

Task Model

javascript

Task Controller

javascript

Unit Test for the Controller

javascript

Integration Tests with Mocha and Supertest

Task Routes

javascript

Express Server

javascript

Integration Test with Supertest

javascript

End-to-End (E2E) Tests with Cypress

E2E Test

javascript

Cypress Configuration

cypress.json File

json

Running Cypress

shell

Conclusion

These examples illustrate how you can combine various tools and techniques to perform unit, integration, and E2E tests in your Node.js applications. By following best practices and using proper tools, you can ensure your application is robust and reliable. In the final chapter, we will summarize the lessons learned and discuss the next steps to further improve your testing skills.