A steam locomotive from 1993 broke my yarn test

7 min read So the story begins with a pair programming session I had with my colleague, which I desperately needed because my node skill tree is still at level 1, and I needed to get started with React because I'll be working on our internal backstage instance. We worked together on a small feature, tested it locally, and it worked. Great. Now it's time to make My Very First React Commit. So I ran the usual git add and git commit , which hooked into yarn test , to automatically run unit tests for backstage, and that's when everything got derailed. For all the React tutorials I have followed, I have never actually run a yarn test on my machine. And the first time I tried yarn test, it hung, and after a long time, the command eventually failed: Determining test suites to run... ● Test suite failed to run thrown: [Error] error Command failed with exit code 1. info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command. 🌈 backstage ⚡ I could tell it was obviousl ... Read full article.