    it "should get a 200 with html for an authorized user" do

      def @bus.is_admin_lookup
        proc { |_| true }
      end

      get "/message-bus/_diagnostics"
      last_response.status.must_equal 200
    end
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.