Trying to test a helper...

welcome_helper.rb

module WelcomeHelper

  def social_share_button(network)
    content_tag :div, class: "btn btn-#{network}" do
      link_to ENV["#{network}_share"] do
        image_tag "#{network}.png", class: 'social-image'
      end
    end
  end

end

welcome_helper_spec.rb

require 'rails_helper'

RSpec.describe WelcomeHelper do

  describe '#social_share_button' do
    expect(helper.social_share_button 'facebook').to 'some assertion'
  end

end