# File lib/spring/test/acceptance_test.rb, line 54
      def refute_output_includes(command, not_expected)
        artifacts = app.run(*Array(command))
        not_expected.each do |stream, output|
          assert !artifacts[stream].include?(output),
                 "expected #{stream} to not include '#{output}'.\n\n#{app.debug(artifacts)}"
        end
      end