Web Development with Node.JS and MongoDB (Video 30)

This video tutorial introduces Sinon.js, a library for testing JavaScript code, focusing on mocks, stubs, and spies. It explains how to use mocks to simulate behavior and set expectations, and discusses the importance of dependency injection in testing. The video also covers setting up tests, using mock databases, and testing controllers with Super Test. Finally, it provides a brief overview of what will be covered in the next video about Karma.

What is the primary purpose of Sinon.js in testing?

• To create user interfaces

• To manage database connections

• To assist in writing tests by providing spies, stubs, and mocks

• To compile JavaScript code

What is a mock in the context of testing?

• A method for optimizing performance

• A real object used in production

• A tool for debugging code

• A test double that simulates behavior and allows setting expectations

Why should you avoid mocking domain or business objects?

• Because it can lead to inaccurate test results

• Because they are too complex

• Because they are not supported by Sinon.js

• Because they are not part of the codebase

What is one benefit of using dependency injection in testing?

• It increases the complexity of the code

• It allows for easier testing without mocks

• It requires more resources

• It is only useful for large applications

How can you provide a dependency using dependency injection?

• By creating a new instance every time

• By using a global variable

• By providing it as an argument

• By hardcoding it into the application

What is the purpose of adding a test script to package.json?

• To manage application dependencies

• To improve application performance

• To automate the deployment process

• To ensure tests are run every time NPM test is executed

Which module can be used to test that a page returns an expected status code?

• React.js

• Node.js

• Super Test

• Express.js