Homebrew tap for CircleCI packages - see https://docs.brew.sh/How-to-Create-and-Maintain-a-Tap
brew install circleci/tap/<formula>
Or brew tap circleci/tap and then brew install <formula>.
NOTE: This cask has been disabled. To use this CircleCI CLI extension install the CircleCI CLI and run circleci extension install testsuite.
brew help, man brew or check Homebrew's documentation.