Install bundler and 'selenium-webdriver' gem
gem install bundler
bundle install
Install drivers
Mac:
brew install chromedriver for chrome
brew install geckodriver for firefox
Linux:
sudo apt-get install chromedriver
sudo apt-get install geckodriver
For any other supported drivers please download it from https://www.seleniumhq.org/about/platforms.jsp and put into directory that in your PATH
ruby test_task_upwork_spec.rb firefox Ruby
where "firefox" is a browser and "Ruby" is a keyword.