So you’ve written your tests in Jest and now you’re either getting warning messages in your console, perhaps about event emitters or memory leaks, or maybe you’ve pushed up to a remote repository like BitBucket and now your Pipelines are failing and you can’t quite figure out why. I’ve had Read more…
So you have a component in your application that uses a file input to return a FileList and now you want to write some tests for it, there is a problem however, JavaScript doesn’t provide a constructor for FileList’s meaning you can’t do anything along the lines of: Now you Read more…
I’m about to write a couple of posts that involve the use of Symbols in JavaScript so thought I better do a quick primer that I can link to for people who aren’t familiar with them. What are Symbols A Symbol is a JavaScript primitive (like a String, Boolean, or Read more…
The Symptoms You have empty coverage reports or there are files missing from your coverage report. You’ve definitely written tests that include those files and can’t figure out what you’re doing wrong. Note that I had this issue with Vue.js and the Vue CLI specifically, it could also be an Read more…
Something that I’ve been looking forward to using post Node 16 is structuredClone(). It’s been available in browser for a little while and was introduced in Node version 17.0.0, it’s an answer to the lack of a decent way to clone objects in JavaScript. Making a shallow clone of an Read more…