daily-email: add 2023-08-30

TDD and Unexpected errors

src/content/daily-email/2023-08-30.md

@@ -0,0 +1,22 @@
+---
+title: >
+  TDD and "Unexpected errors"
+pubDate: 2023-08-30
+permalink: >
+  archive/2023/08/30/tdd-and-unexpected-errors
+tags:
+  - automated-testing
+  - test-driven-development
+---
+
+When working on projects, it's common to see messages like "The website encountered an unexpected error. Please try again later.".
+
+Usually, this is the message shown to the user, whilst a more detailed error message is logged for Developers to diagnose and fix the underlying error.
+
+The wording "unexpected error" has been intriguing to me, though. When do you expect an error?
+
+The best example I can think of for an expected error is when doing test-driven development.
+
+When doing TDD, you want to see an error to start as you start with a failing test.
+
+Then, you write the code to remove the error and get the test passing.