Using ServerSpec to verify per-user RVM setup

rvm_spec.rb

def command_as(command, as:)
  command(%Q{su -c #{Shellwords.escape(command)} --login #{as}})
end

%w(my_user).each do |user|
  describe "RVM setup for user #{user}" do
    %w(ruby-2.4.0).each do |ruby_version|
      let(:subject) { command_as('rvm list strings', as: user) }
      it "has #{ruby_version} installed" do
        expect(subject.stdout.split("\n")).to include(ruby_version)
      end
    end
  end
end