Gems in Gemfile:

group :test, :development do
  gem 'database_cleaner'
  gem "rspec-rails", "~> 3.6.0"
  gem 'selenium-webdriver'
end

group :test do
  gem "capybara", "~> 2.14.0"
end

rails_helper:

config.use_transactional_fixtures = false

  config.before(:suite) do
    DatabaseCleaner.clean_with(:truncation)
  end

  config.before(:each) do
    DatabaseCleaner.strategy = :transaction
  end

  config.before(:each, js: true) do
    DatabaseCleaner.strategy = :truncation
  end

  config.before(:each) do
    DatabaseCleaner.start
  end

  config.after(:each) do
    DatabaseCleaner.clean
  end

  #Puma makes it possible to run RSpec with ActionCable
  Capybara.server = :puma

  Capybara.register_driver :selenium_chrome do |app|
    Capybara::Selenium::Driver.new(app, browser: :chrome)
  end
  Capybara.javascript_driver = :selenium_chrome

And, the driver:

brew install chromedriver