Test coverage is a tool for finding untested code and says nothing about how good the tests are.

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Our reading — they may agree, disagree or merely touch the same thing. Closest first: a shared subject counts for most, then how near the wording is.

• A language-agnostic conformance suite is the most powerful thing you can hand a coding agent, because the whole instruction becomes: write code until these tests pass. SWSimon Willison19 Mar 2026software quality
• A passing test suite is not evidence that the software works, so an agent must also be made to start the thing and exercise it the way a person would. SWSimon Willison19 Mar 2026software quality
• Adding a config option so nobody breaks compounds into permutations no test suite can cover, because it is infinitely harder to evolve software that has users. PSPeter Steinberger10 Aug 2026software quality
• Agentic code review raises the floor but cannot be trusted, because the model reading the code is the same model that wrote it, and it will tell you the code is great. DHDex Horthy15 Jul 2026software quality
• Apple has more reason to stumble now than ever: terribly behind on AI, faltering software quality, rivals catching up on silicon, and a leadership too old to relearn. DHDavid Heinemeier Hansson12 Jul 2025software quality

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