code: function benchmarkSelect(numLeft, callback) {
    //connection.query('query from fake server fixture', function(err, result) {
  
    // comment if no pool:
    next();
  
    let rows = 0;
    const q = connection.query('query from fake server fixture');
    q.on('result', () => {
      rows++;
    });
    q.on('end', () => {
      if (numLeft > 1) benchmarkSelect(numLeft - 1, callback);
      else callback(rows);
    });
  }
docs: ======================