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daily-email: add 2023-09-18

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Increasing test coverage with regression tests
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Oliver Davies 2023-09-22 08:29:52 +01:00
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---
title: >
Increasing test coverage with regression tests
pubDate: 2023-09-18
permalink: >
archive/2023/09/18/increasing-test-coverage-with-regression-tests
tags:
- software-development
- automated-testing
- test-driven-development
---
Automated test suites don't tell you everything works - they tell you what you've tested isn't broken.
Having tests doesn't mean your code is bug-free. There could be edge cases or scenarios you haven't tested for that contain bugs, even though your test suite is passing.
## What do we do?
When you find a bug, try replicating it within an automated test before attempting to fix it.
Once you have a failing test and can replicate the issue, go ahead and fix it.
If the test passes, you know you've fixed the bug and solved the issue.
## Here's the thing
Now you have this test, you cannot re-add the bug again without the test failing. You've prevented anyone from accidentally re-introducing it in the future and increased your test coverage.