test.rb

RSpec.configure do |config|

  config.before_tag :javascript do
    setup_javascript_shit!
  end

  config.after_tag :javascript do
    teardown_javascript_shit!
  end

  config.before_tag :important do
    # this runs at the beginning of any example tagged with before
  end
  
end

tag :important

describe Foo do
  
  before do
  end

  before_tag :foo do
  end

  tag.important do
  end

  important do
  end

  tag :important
  it 'should do something', :important do
    # ...
  end

  tag :billing, :javascript
  it 'should do something else', :billing, :javascript do
    # ...
  end

end