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+---
+title: >
+  Documentation and comments get stale. Tests don't.
+pubDate: 2023-09-22
+permalink: >-
+  daily/2023/09/22/documentation-and-comments-get-stale
+tags:
+  - software-development
+  - automated-testing
+  - static-analysis
+---
+
+I'm sure you've seen code comments that say the code will do something when, in fact, it does something different.
+
+Or documentation that has become outdated and stale and no longer correct.
+
+Automated tests and other tools, such as static analysis, are executable documentation, so they can't become stale.
+
+If the implementation code changes and no longer matches the tests, the tests will fail, and either the implementation or test can be updated.
+
+Then, if you need to refer to the test, as long as it's passing, you know what it shows is still applicable.
+
+The same can't be said for markdown files, Confluence pages, Word documents or other static documentation.