class Guard::RSpec::Dsl

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