# How automated testing improves development of complex features

DevFeed: [How automated testing improves development of complex features](<https://devfeed.tech/articles/my-life-before-after-automated-testing-38402.md>)

Original publisher: [Read original article](<https://blog.danlew.net/2026/09/15/my-life-before-after-automated-testing/>)

Author: Dan Lew

Published: 2026-09-15T13:16:49Z

Content type: opinion

Language: en

Sources: [Dan Lew Blog](<https://devfeed.tech/sources/dan-lew-blog.md>)

Topics: [Testing](<https://devfeed.tech/topics/testing.md>), [coding](<https://devfeed.tech/topics/coding.md>), [Concurrency](<https://devfeed.tech/topics/concurrency.md>), [Database](<https://devfeed.tech/topics/database.md>)

Tags: [automated](<https://devfeed.tech/tags/automated.md>), [concurrency](<https://devfeed.tech/tags/concurrency.md>), [database](<https://devfeed.tech/tags/database.md>), [regression](<https://devfeed.tech/tags/regression.md>), [testing](<https://devfeed.tech/tags/testing.md>)

## AI overview

The author contrasts manual testing with automated testing while developing job cancellation in a work queue. Automated tests help expose concurrency and regression risks, cover corner cases, and simulate mid-execution cancellation more reliably.

## Source excerpt

It's hard for me to overstate how much my coding has improved since embracing automated testing. And yet, I used to think of it as a waste of time! This post is for my former self, demonstrating why I embrace the practice now. Allow me to demonstrate with