The Wayback Machine - https://web.archive.org/web/20230408042557/https://codeql.github.com/docs/codeql-cli/testing-custom-queries/
CodeQL documentation

Testing custom queries

This article was moved to “Testing custom queries” on the GitHub Docs site as of January 2023.

The source file now exists in the public, open-source docs repository. If you would like to contribute, you can consult the GitHub docs contributing guide.

If you want to go to a specific subsection in the new location, see the TOC links below.