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My program uses the OpenAI client to interface with various LLMs, including OpenRouter, Groq, and GPT. To test this functionality, we were encouraged to use an HTTP mocking library like Nock, but it made more sense to me to mock the OpenAI client in Jest using jest.mock. In order to do this, I had to move the initialization for the OpenAI client to a separate file so that the instance could be imported and mocked in tests.
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SurveyJS
JavaScript Form Builder with No-Code UI & Built-In JSON Schema Editor. Keep full control over the data you collect and tailor the form builder’s entire look and feel to your users’ needs. SurveyJS works with React, Angular, Vue 3, and is compatible with any backend or auth system. Learn more.
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An alternative I was considering was Vitest, because last time I tried using Jest I had to figure out how to deal with TypeScript and ES modules. I was talking to my friend Vinh who wanted to set up Jest on his project too, and his project used ES module syntax, and so he ran into trouble since Jest support for it is still experimental. But since my project uses CommonJS syntax and Jest is still much more widely used, I decided to stick with it.
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superagent
Ajax for Node.js and browsers (JS HTTP client). Maintained for @forwardemail, @ladjs, @spamscanner, @breejs, @cabinjs, and @lassjs.
Even though I've done testing before in other courses and was already familiar with Jest, I'd never read the docs thoroughly or used the mock functionality (working with servers in the past, I'd used superagent), so I learned a lot working on these tests. I think mocking and setup/teardown are incredibly useful features to have when writing tests.
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To do this, I chose Jest because it is the most popular testing framework for JavaScript and it is a mature technology, meaning there is plenty of great documentation and examples and a large ecosystem around it.
