# Reference Reference docs for Juju developers * [Agent](https://documentation.ubuntu.com/juju/4.0/contributor/reference/agent.md) * [Binary container agent](https://documentation.ubuntu.com/juju/4.0/contributor/reference/binary-containeragent.md) * [Catacomb package](https://documentation.ubuntu.com/juju/4.0/contributor/reference/catacomb-package.md) * [Conventional commits](https://documentation.ubuntu.com/juju/4.0/contributor/reference/conventional-commits.md) * [CVEs](https://documentation.ubuntu.com/juju/4.0/contributor/reference/cve.md) * [Dependency package](https://documentation.ubuntu.com/juju/4.0/contributor/reference/dependency-package.md) * [Entity lifecycle](https://documentation.ubuntu.com/juju/4.0/contributor/reference/entity-lifecycle.md) * [High Availability (HA)](https://documentation.ubuntu.com/juju/4.0/contributor/reference/high-availability.md) * [Testing](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing.md) * [Integration testing](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/integration-testing.md) * [Integration test suite](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/integration-testing/integration-test-suite.md) * [Test include](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/integration-testing/test-include.md) * [Unit testing](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/unit-testing.md) * [Checker](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/unit-testing/checker.md) * [Unit test suite](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/unit-testing/unit-test-suite.md) * [Util suite](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/unit-testing/util-suite.md) * [Tomb package](https://documentation.ubuntu.com/juju/4.0/contributor/reference/tomb-package.md) * [Worker](https://documentation.ubuntu.com/juju/4.0/contributor/reference/worker.md) * [Worker interface](https://documentation.ubuntu.com/juju/4.0/contributor/reference/worker-interface.md) * [Worker package](https://documentation.ubuntu.com/juju/4.0/contributor/reference/worker-package.md) * [Writing workers](https://documentation.ubuntu.com/juju/4.0/contributor/reference/writing-workers.md)