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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.