Sinon.JS VS jest

Mocha is a simple and flexible JavaScript testing framework for browser and Node.js applications. Unlike other testing frameworks, it takes a minimalist approach and relies on external libraries for key tasks. It uses Sinon for handling spies, stubs, and mocks, and Chai as the assertion engine. Mocha is extensible through many plugins and can integrate with most test runners.

As Obsidian code is not available; we must provide some alternate implementation. If you're familiar with sinon, you might think we can create a stubbed instance like this:

If you are using a mocking library, such as sinon, jest-mock, or ts-mockito, make sure that it is compatible with Jest. You may need to install additional packages or configure them in your configuration file. For example, to use sinon with Jest, you can install the sinon-jest package and add the following to your configuration file:

Mocha is a test runner, Chai is an assertion library, Sinon is a mocking library, this normally the combination you would need to use if you choose mocha, but there are others.

Instead, use pure functions + dependency inject your stubs (e.g. parameter to function). Also note, no need for Sinon or some other test double library. JavaScript is so good nowadays to easily make objects/classes/functions or any combination thereof on the fly that are terse.

I've had some good experiences with Ava + Sinon. I've personally disliked Jest because it seemed to do some weird trickery in the background that prevented me from using ES modules.

🤖 You can use the Mocha testing framework with the Chai assertion library to write tests for your Express controller. You can also use the Sinon library to mock the database calls. This will allow you to test the controller without actually making a call to the database. You can also use the SuperTest library to make HTTP requests to the controller and test the response.

You can use sinon js to create a mock version of your http library (axios) that responds with the data you’re expecting.

Assertions are the checkpoints of our test block that confirm if an automated test has passed or failed. Cypress bundles the Chai, jQuery, and Sinon.JS libraries for assertions. They check the desired, expected application in which the test is running. A complete listing of assertions can be found in the documentation here.

ES module is basically a "class" that you inject dependencies into through imports. And for tests you just use something like sinon to swap module dependencies for mocks.

Jest y Cypress

Jest and React Testing Library are popular tools used to test React applications. These libraries provide tools for mocking dependencies, simulating user interactions, and asserting the expected behavior of our components.

Now, let's add a test to ensure our hooks are working as we expect them to and to alert us to any breaking changes in the code that might be introduced later. First, add the packages below so we can use jest in our project.

Jest is an all-in-one JavaScript testing framework with a focus on simplicity. It supports projects using Babel, TypeScript, Node.js, React, Angular, Vue, and more. To maximize performance, it runs tests in parallel on isolated processes. Jest comes with an integrated assertion engine based on the expect() function and requires zero configuration for most projects.

✅ Angular 18 ✅ Angular Material ✅ Unit Testing with Jest ✅ End-to-End Testing with Cypress ✅ Internationalization with Transloco ✅ Auto documentation with Compodoc ✅ Provide component examples with Storybook ✅ Analyse your project with source-map-explorer ✅ Docker ✅ ESLint ✅ Prettier ✅ Commit Linting ✅ AuditJS Audit this application using Sonatype OSS Index ✅ Auto-generate a CHANGELOG with auto-changelog

If you've ever done any type of testing with Node.js, you most likely have come up with libraries like Jest, Mocha or Vitest. This is because Node.js for a long time has never provided a native way to do testing. If you wanted some type of testing, you'd have to draw on testing libraries.

test: Run tests - if you're using Jest, it's just "test": "jest" or vitest for Vitest.

5. Automated Tests: Unit tests are automated tests that verify the behavior of a small unit of code in isolation. I like to write unit tests for every bug reported by a user. This way, I can reproduce the bug in a controlled environment and verify that the fix works as expected and that we wont see a regression. There are many different JavaScript test frameworks like Jest, cypress, mocha, and jasmine. We use Rspec and Minitest for unit and integration tests in our rails application.

Jest

Jest is a delightful JavaScript testing framework with a focus on simplicity.