# Writing Clear, Focused Assertions in Unit Tests

DevFeed: [Writing Clear, Focused Assertions in Unit Tests](<https://devfeed.tech/articles/the-1-mistake-in-unit-testing-and-how-to-fix-it-26213.md>)

Original publisher: [Read original article](<https://craftbettersoftware.com/p/the-1-mistake-in-unit-testing-and>)

Author: Daniel Moka

Published: 2025-05-24T05:01:11Z

Content type: tutorial

Language: en

Sources: [Craft Better Software](<https://devfeed.tech/sources/craft-better-software.md>)

Topics: [Testing](<https://devfeed.tech/topics/testing.md>), [Unit testing](<https://devfeed.tech/topics/unit-testing.md>), [clean-code](<https://devfeed.tech/topics/clean-code.md>)

Tags: [best-practices](<https://devfeed.tech/tags/best-practices.md>), [clean-code](<https://devfeed.tech/tags/clean-code.md>), [readability](<https://devfeed.tech/tags/readability.md>), [techniques](<https://devfeed.tech/tags/techniques.md>), [testing](<https://devfeed.tech/tags/testing.md>), [unit-testing](<https://devfeed.tech/tags/unit-testing.md>), [writing](<https://devfeed.tech/tags/writing.md>)

## AI overview

The article presents five practices for writing clean, expressive assertions in unit tests. It emphasizes testing one logical behavior per test, capturing domain knowledge through well-named helper functions, and treating tests as documentation.

## Source excerpt

Best practices to nail the most important part of your unit test