# File lib/guard/rspec/dsl.rb, line 16
      def self.detect_spec_file_for(rspec, file)
        # TODO: when spec not found ... run specs in topmost found path?
        # Or show warning?

        path = "#{rspec.spec_dir}/#{file}_spec.rb"
        return path unless file.start_with?("lib/")
        return path if Dir.exist?("#{rspec.spec_dir}/lib")

        without_lib = file.sub(%r{^lib/}, "")
        "#{rspec.spec_dir}/#{without_lib}_spec.rb"
      end