ArchUnit

Uses a plain Java fluent API to define rules, making them easy to write and understand without learning a new DSL, as demonstrated in the README's example code and GIF.

Integrates directly with JUnit and other testing frameworks, allowing architecture tests to run as part of the standard test suite, ensuring continuous validation during development.

Analyzes Java bytecode to inspect the actual compiled structure, ensuring rules are enforced on the real code, not just source annotations or configurations.

The library is designed to be extensible, enabling developers to create custom architectural checks beyond built-in features, as highlighted in its philosophy of plain Java definitions.