# Juju

> Juju is an open source orchestration engine for deploying, integrating, and managing applications across Kubernetes, VMs, and bare metal using software operators called charms.


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## Pages in this subsection

- [Testing](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing.md): Understand Juju's testing requirements and frameworks, covering unit testing and integration testing strategies for contributors.
- [Integration testing](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/integration-testing.md): Write integration tests for Juju using bash scripts, test suites, and includes for comprehensive end-to-end testing.
- [Integration test suite](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/integration-testing/integration-test-suite.md): Build integration test suites for Juju with organized setup, teardown logic, and reusable test includes for bash-based testing.
- [Test include](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/integration-testing/test-include.md): Utilize bash test includes for Juju integration testing, including check functions, cleanup utilities, and juju command helpers.
- [Unit testing](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/unit-testing.md): Learn about unit testing in Juju with gocheck package, including test suites, checkers, and util suite composition patterns.
- [Checker](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/unit-testing/checker.md): Use gocheck checkers for assertions in Juju unit tests, including IsNil, Equals, DeepEquals, and ErrorMatches patterns.
- [Unit test suite](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/unit-testing/unit-test-suite.md): Create structured unit test suites with distinct setup and teardown logic using util suite composition for Juju testing.
- [Util suite](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/unit-testing/util-suite.md): Leverage util suites like BaseSuite and FakeHomeSuite for structured test setup, teardown, and environment isolation in Juju.

## Optional

- [Top-level llms.txt](https://documentation.ubuntu.com/juju/4.0/llms.txt): Complete documentation index.