I’ve recently joined Cogent as a Lead Developer and before that, I worked on Data related systems as a Data Engineer and as an Architect. I’d like to bring some of the knowledge and experience from these domains to the Cogent community and so I thought that cross posting this article (that also appears on my personal blog), would be a good way to start.

A co-worker and I were writing tests for a hook we’d created and we kept running the same warning. So we decided to dig a little deeper and work out what was really going on. What resulted was a wild ride through the inner workings of hooks, testing utilities, and how asynchronous events are handled in JavaScript. If you’re curious too, then keep reading.