---
title: "Discussion on \"Mutation Testing, Explained: How to Know If Your Tests Can Actually Fail\" | Hashnode"
description: "Discussion on \"Mutation Testing, Explained: How to Know If Your Tests Can Actually Fail\". 100% coverage can still ship the bug. Five tests that can't fail, why AI writes them, and a 15-minute Sabotage Test to find them."
url: "https://hashnode.com/posts/mutation-testing-tests-that-cannot-fail/6af3eb9ceef613df6becb903"
---

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Discussion

# [Mutation Testing, Explained: How to Know If Your Tests Can Actually Fail](https://simplyexplained.hashnode.dev/mutation-testing-tests-that-cannot-fail?utm_source=hashnode&utm_medium=feed)

100% coverage can still ship the bug. Five tests that can't fail, why AI writes them, and a 15-minute Sabotage Test to find them.

18h ago · 11 min read · simplyexplained.hashnode.dev  
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## Written by

[Adam Jaber](https://hashnode.com/@adamjaber)

@adamjaber · Delhi, India

  
[View profile](https://hashnode.com/@adamjaber)

Senior engineer. How AI and software work — and where they quietly break.

I'm a senior software engineer. I write Simply Explained, a plain-English breakdown of how AI and software actually work, and the quiet ways they break: AI fixes that hide bugs, agents that pick the wrong tool, health checks that take down healthy servers. One symptom, one analogy, one fix per piece. New here? Start with the pinned Start Here guide, or get one breakdown a week by email.

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