oliverdavies.uk/source/_daily_emails/2024-02-02.md

---
title: Automated tests prevent you from adding regressions
date: 2024-02-02
permalink: daily/2024/02/02/automated-tests-prevent-you-from-adding-regressions
snippet: |
  Having automated tests recently saved me from adding a regression to a project.
tags:
  - software-development
  - automated-testing
  - test-driven-development
---

Continuing from [my last few emails]({{site.url}}/archive/2024/01/30/tdd-doesnt-mean-you-know-everything-upfront), as well as adding the new use case more easily and quicker, having automated tests also saved me from adding a regression into the code I was changing.

I'd written a condition in the query to ensure only results that started with the search term.

Initially, I removed it, but then the tests failed.

This reminded me why I'd written the condition that way, and I was able to re-add my fix differently.

Without the tests, I'd likely have removed it and introduced a regression.

Whilst fixing a bug, I'd have introduced a different bug.

My tests saved me from doing that and I was able to rectify it quickly before pushing to CI or the staging environment.
Add daily email for 2024-02-02 Automated tests prevent you from adding regressions 2024-02-03 23:55:01 +00:00			`---`
			`title: Automated tests prevent you from adding regressions`
			`date: 2024-02-02`
Update daily email permalinks This is a follow-up to commit 3be9031de882942f87331f607a2298a6d13f4528 as each daily email has a `permalink` value that overrides the default content type permalink. 2024-05-20 22:58:27 +00:00			`permalink: daily/2024/02/02/automated-tests-prevent-you-from-adding-regressions`
Add daily email for 2024-02-02 Automated tests prevent you from adding regressions 2024-02-03 23:55:01 +00:00			`snippet: \|`
Change to two spaces 2024-09-08 22:09:54 +00:00			`Having automated tests recently saved me from adding a regression to a project.`
Add daily email for 2024-02-02 Automated tests prevent you from adding regressions 2024-02-03 23:55:01 +00:00			`tags:`
Change to two spaces 2024-09-08 22:09:54 +00:00			`- software-development`
			`- automated-testing`
			`- test-driven-development`
Add daily email for 2024-02-02 Automated tests prevent you from adding regressions 2024-02-03 23:55:01 +00:00			`---`

			`Continuing from [my last few emails]({{site.url}}/archive/2024/01/30/tdd-doesnt-mean-you-know-everything-upfront), as well as adding the new use case more easily and quicker, having automated tests also saved me from adding a regression into the code I was changing.`

			`I'd written a condition in the query to ensure only results that started with the search term.`

			`Initially, I removed it, but then the tests failed.`

			`This reminded me why I'd written the condition that way, and I was able to re-add my fix differently.`

			`Without the tests, I'd likely have removed it and introduced a regression.`

			`Whilst fixing a bug, I'd have introduced a different bug.`

			`My tests saved me from doing that and I was able to rectify it quickly before pushing to CI or the staging environment.`