text: 'use strict';
  
  var path = require('path');
  var stylus = require('stylus');
  var s = '@require "external.css"';
  var opts = { filename: 'index.css', paths: [__dirname] };
  var dep = stylus(s, opts).deps()[0];
  if (path.basename(dep) === 'external.css') {
    stylus.render(s, opts, function (error, css) {
      if (error) return;
      if (css === '@import "external.css";\n') {
        console.log('ok');
      }
    });
  }
  