Simplest way to install all of those is to use Homebrew:
brew cask install docker
This will install a Docker in Applications. To run if from the command-line:
open /Applications/Docker.app
It'll require privileged access and will require user password to be entered.
To validate Docker is installed correctly, run hello-world image:
docker run hello-world
Should be done once only for development purposes, run from the Gerrit checkout path:
docker build -t gerrit/polygerrit-functional:v1 \ polygerrit-ui/app/test/functional/infra
Running a smoke test from Gerrit checkout path:
./polygerrit-ui/app/test/functional/run_functional.sh
The successful output should be something similar to this:
Starting local server.. Starting Webdriver.. Started . 1 spec, 0 failures Finished in 2.565 seconds