text: var fs = require('fs');
  var path = require('path');
  var test = require('tape');
  var resolve = require('../');
  
  test('$NODE_PATH', function (t) {
      t.plan(8);
  
      var isDir = function (dir, cb) {
          if (dir === '/node_path' || dir === 'node_path/x') {
              return cb(null, true);
          }
          fs.stat(dir, function (err, stat) {
              if (!err) {
                  return cb(null, stat.isDirectory());
              }
              if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);
              return cb(err);
          });
      };
  
      resolve('aaa', {
          paths: [
              path.join(__dirname, '/node_path/x'),
              path.join(__dirname, '/node_path/y')
          ],
          basedir: __dirname,
          isDirectory: isDir
      }, function (err, res) {
          t.error(err);
          t.equal(res, path.join(__dirname, '/node_path/x/aaa/index.js'), 'aaa resolves');
      });
  
      resolve('bbb', {
          paths: [
              path.join(__dirname, '/node_path/x'),
              path.join(__dirname, '/node_path/y')
          ],
          basedir: __dirname,
          isDirectory: isDir
      }, function (err, res) {
          t.error(err);
          t.equal(res, path.join(__dirname, '/node_path/y/bbb/index.js'), 'bbb resolves');
      });
  
      resolve('ccc', {
          paths: [
              path.join(__dirname, '/node_path/x'),
              path.join(__dirname, '/node_path/y')
          ],
          basedir: __dirname,
          isDirectory: isDir
      }, function (err, res) {
          t.error(err);
          t.equal(res, path.join(__dirname, '/node_path/x/ccc/index.js'), 'ccc resolves');
      });
  
      // ensure that relative paths still resolve against the regular `node_modules` correctly
      resolve('tap', {
          paths: [
              'node_path'
          ],
          basedir: path.join(__dirname, 'node_path/x'),
          isDirectory: isDir
      }, function (err, res) {
          var root = require('tap/package.json').main; // eslint-disable-line global-require
          t.error(err);
          t.equal(res, path.resolve(__dirname, '..', 'node_modules/tap', root), 'tap resolves');
      });
  });
  