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daily-email: add 2023-06-29

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Tests wont tell you if your code works
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Oliver Davies 2023-07-06 23:32:43 +01:00
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---
title: >
Tests won't tell you if your code works
pubDate: 2023-06-29
permalink: >
archive/2023/06/29/tests-wont-tell-you-if-your-code-works
tags:
- automated-testing
- test-driven-development
---
Having a passing test suite or CI pipeline doesn't tell you if your appliction works.
There could be scenarios or edge-cases that aren't covered within the test suite and contain bugs, but aren't covered by the test suite.
There could be untested code that isn't covered at all.
A passing test suite proves that the tests that have been written so far pass and that there are no regressions introduced by the latest change.
## Here's the thing
Instead of telling you that your application works by passing, the test suite tells you something is broken when it fails.
If a previously-passing test is failing, the application is broken and should not be deployed - not that the application is working if the tests don't fail.