daily-email: add 2023-11-14

Why I prefer integration tests to unit tests

src/content/daily-email/2023-11-14.md

@@ -0,0 +1,26 @@
+---
+title: >
+  Why I prefer integration tests to unit tests
+pubDate: 2023-11-14
+permalink: >
+  archive/2023/11/14/why-i-prefer-integration-tests-to-unit-tests
+tags:
+  - software-development
+  - automated-testing
+  - test-driven-development
+  - mocking
+---
+
+With unit tests, you need to mock __everything__.
+
+If what you're testing has a dependency, you need to create and use a mock version.
+
+If the mock has its own dependencies, you need to mock those, too.
+
+I've written unit tests with mocks and accidentally only tested the mocks instead of the functionality I intended.
+
+## Here's the thing
+
+With integration tests, you can use and test the real dependencies.
+
+Whilst they may be slightly slower to run, I prefer the simpler setup, less need for mocks, and knowing the real services work - not just the mocked versions.