Add daily email for 2024-11-03

Passing tests doesn't mean a working application

source/_daily_emails/2024-11-03.md

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+---
+title: Passing tests doesn't mean a working application
+date: 2024-11-03
+permalink: daily/2024/11/03/passing-tests-doesnt-mean-a-working-application
+tags:
+  - software-development
+  - automated-testing
+  - test-driven-development
+cta: d7eol
+snippet: |
+  Having a passing test suite doesn't mean your application works.
+---
+
+Having a passing test suite doesn't mean everything in your application is working.
+
+It means the functionality you previously tested is working.
+
+There may be edge cases you haven't covered or whole tests you haven't written yet, which may be working or could be broken.
+
+If you have tests that were passing that are now failing, you know you've broken something.
+
+Something that was previously working is broken and shouldn't be deployed.
+
+That's why having tests is important - they give you the ability to identify and fix regressions before they are released.