For those who don’t know what conftest is, conftest is an open-source utility that helps engineers write tests against structured configuration data. At the time of writing, conftest supports many formats such as YAML, JSON, Dockerfile, and HCL/HCL2 amongst others. This variety of formats allows teams to validate their configurations regardless of the platform they belong to before making changes to live systems. Conftest relies on the Rego language from Open Policy Agent for writing the assertions, which is a high-level declarative language that lets users specify policy as code and offload their policy decision-making from their software.