# Using Mutation Testing to Evaluate Test Suite Effectiveness

DevFeed: [Using Mutation Testing to Evaluate Test Suite Effectiveness](<https://devfeed.tech/articles/test-your-test-23032.md>)

Original publisher: [Read original article](<https://www.javaadvent.com/2025/12/test-your-test.html>)

Author: Andres Sacco

Published: 2025-12-04T02:02:10Z

Content type: tutorial

Language: en

Sources: [Java Advent Calendar](<https://devfeed.tech/sources/java-advent-calendar.md>)

Topics: [mutation-testing](<https://devfeed.tech/topics/mutation-testing.md>), [Testing](<https://devfeed.tech/topics/testing.md>), [test-coverage](<https://devfeed.tech/topics/test-coverage.md>), [Code](<https://devfeed.tech/topics/code.md>)

Tags: [2025](<https://devfeed.tech/tags/2025.md>), [code](<https://devfeed.tech/tags/code.md>), [code-coverage](<https://devfeed.tech/tags/code-coverage.md>), [effective](<https://devfeed.tech/tags/effective.md>), [mutation](<https://devfeed.tech/tags/mutation.md>), [mutation-testing](<https://devfeed.tech/tags/mutation-testing.md>), [testing](<https://devfeed.tech/tags/testing.md>), [tests](<https://devfeed.tech/tags/tests.md>)

## AI overview

The article explains why high code coverage does not necessarily indicate effective tests. It introduces mutation testing, which evaluates a test suite by making small controlled changes to source code and checking whether the tests detect those changes.

## Source excerpt

Creating or modifying an application involves many aspects, such as following best practices and applying design patterns to solve everyday problems. After writing the code, developers usually add unit tests and rely on tools like Sonar to track metrics such as code coverage and highlight potentially untested areas. However, high test coverage does not guarantee [...] The post Test Your Test appeared first on JVM Advent.