nginx rspec matcher

gistfile1.txt

    RSpec::Matchers.define :upstream_to do |server|
      match do |content|
        escaped_server = Regexp.escape(server)
        !(content=~/upstream #{@upstreamer} \{[^}]+server #{escaped_server};/m).nil?
      end

      chain :through do |upstreamer|
        @upstreamer = upstreamer
      end

      failure_message do |content|
        "expected Nginx to upstream to '#{server}' via '#{@upstreamer}'"
      end
    end