# File lib/parallel_specs.rb, line 11
  def self.executable
    cmd = if File.file?("script/spec")
      "script/spec"
    elsif bundler_enabled?
      cmd = (run("bundle show rspec") =~ %r{/rspec-1[^/]+$} ? "spec" : "rspec")
      "bundle exec #{cmd}"
    else
      %w[spec rspec].detect{|cmd| system "#{cmd} --version > /dev/null 2>&1" }
    end
    cmd or raise("Can't find executables rspec or spec")
  end