code: function execFile() {
        var child;
  
        if (options.strategy === 'development') {
          child = core.spawnPump(options, false, false);
          if (options.relay) child.pump(process);
        } else if (options.strategy === 'unattached') {
          child = core.spawnPump(options, true, false);
        } else if (options.strategy === 'daemon') {
          child = core.spawnDaemon(options, true);
        }
  
        // start child
        child.spawn();
  
        child.on('start', function () {
          callback(null);
        });
      }
docs: this will execute when all tests are made