As described in the README, you simply pass the multiple responses to the to_return
method as arguments. Basically you want something like:
stub_request(:get, "www.google.de").to_return(rr[0], rr[1], rr[2])
But listing the array values like that is a bit clunky (and won't work with a variable number of responses), so you should instead use Ruby's splat operator:
responses = Dir[File.expand_path("../../markups/*.txt", __FILE__)].map{|f| File.read(f)}
stub_request(:get, "www.google.de").to_return(*responses)