Add daily email for 2024-01-30

TDD doesn't mean you know everything upfront

source/_daily_emails/2024-01-30.md

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+---
+title: TDD doesn't mean you know everything upfront
+date: 2024-01-30
+permalink: archive/2024/01/30/tdd-doesnt-mean-you-know-everything-upfront
+snippet: |
+  Test-Driven Development doesn't mean you need to know everything upfront.
+tags:
+  - software-development
+  - automated-testing
+  - test-driven-development
+---
+
+I'm in the final phase of a Drupal development project for a customer.
+
+It has some custom modules and code I wrote with automated tests and test-driven development.
+
+Today, the client reported a bug.
+
+But, instead of something working incorrectly, this was a use case I hadn't considered.
+
+The tests were passing, but there wasn't one for this.
+
+I wrote the code for the use cases I was aware of when I started, and now I'm aware of another, I can add a test for it and ensure it's tested and working.
+
+To do test-driven development, you don't need to know all the use cases and functionality upfront.
+
+Write for what you know at the time, then expand and iterate in the future.