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+---
+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}}/daily/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.