# ArchUnit

6 Hacker News commenters recommended ArchUnit and 0 criticized it, November 2025 to November 2026. It was recommended in 4 of 13 months.

**Verdict:** Free Java library that enforces architecture rules as tests, breaking the build deterministically when code violates them, so rules get enforced rather than only written down.

## Why people recommend it

- Deterministic checks that fail the build (2 comments): "Things like ArchUnit, static analyzers, and other deterministic tools can help with lower level things like architecture." ([source](https://news.ycombinator.com/item?id=49170281)) "it's versioned with the project, and it breaks the build deterministically" ([source](https://news.ycombinator.com/item?id=45914068))
- Enforces architecture decisions automatically (2 comments): "Things like ArchUnit, static analyzers, and other deterministic tools can help with lower level things like architecture." ([source](https://news.ycombinator.com/item?id=49170281)) "Enforce architecture decisions (see archunit). But somebody needs to write them down first." ([source](https://news.ycombinator.com/item?id=49802643))

## Alternatives hackers recommend

- [Mockito](https://hackerapproved.com/p/mockito.md): 19 recommend
- [cargo-nextest](https://hackerapproved.com/p/cargo-nextest.md): 18 recommend
- [Vitest](https://hackerapproved.com/p/vitest.md): 17 recommend
- [Testcontainers](https://hackerapproved.com/p/testcontainers.md): 14 recommend
- [pytest](https://hackerapproved.com/p/pytest.md): 12 recommend

## Cite as

Hacker Approved, "ArchUnit", https://hackerapproved.com/p/archunit/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).