stdout, status = Open3.capture2(command)

if status.success?
  puts stdout
else
  puts stdout
  throw "error: could not execute"
end

it "throws an error" do
  status = double("status message", :success? => false)
  allow(Open3).to receive(:capture2).and_return("wat?", status)
  ScreenShotWorker.new.perform(url: "www.google.com")
  expect(Open3).to have_received(:capture2)
end