Posts about Jest

Mock Fetch in TypeScript Jest Tests for Vue.js

May 17th 2019 Unit Testing Jest Vue.js

When creating my first Vue.js project I configured it for TypeScript support and Jest based unit testing. This might not be the most common setup but it does express my tooling preferences. To no surprise, the first component I wanted to unit test used fetch which meant I also had to use jest-fetch-mock to mock its calls. There were a couple of obstacles on the way to the first working test.

Testing JavaScript/TypeScript Snippets with Jest

I often need to quickly test some JavaScript or TypeScript code, be it for a blog post or otherwise. Recently, I started using Jest for that because it's so simple to set up. For basic JavaScript code, it's enough to install the npm package. Although Jest doesn't have built-in support for TypeScript, it's almost just as easy to use with the help of ts-jest.