Test-Driven Development - Tag - Daily Deep Think https://blog.baifan.site/en/tags/test-driven-development/ Test-Driven Development - Tag - Daily Deep Think Hugo -- gohugo.ioenblog@baifan.site (ByF) blog@baifan.site (ByF)Wed, 05 Aug 2026 14:28:39 +0800 Give AI a Rulebook: From Wishing Upon It to Making It Behave https://blog.baifan.site/en/give-ai-a-rulebook/ Wed, 05 Aug 2026 14:28:39 +0800 ByF https://blog.baifan.site/en/give-ai-a-rulebook/

Let me start with something that actually happened.

In early 2025, I added a feature to an internal system: export to Excel. Small requirement — I didn’t even write it up, just typed “add an export button to the list page” into the chat box.

The AI delivered in ten minutes. Frontend changes, new endpoint, SQL — all in one pass. I was pleased when I opened the PR, right up until review revealed: the export columns didn’t match the list page, a hundred thousand rows would hang the service outright, there was no permission check, and the tests only covered the happy path.

]]>