function runSync () {
    for (runIndex = 0; runIndex < sampleSize; runIndex++) {
      fn.call(child)
    }
    setTimeout(finishChild, 0)
  }
function runSync () {
    for (runIndex = 0; runIndex < sampleSize; runIndex++) {
      fn.call(child)
    }
    setTimeout(finishChild, 0)
  }
function runSync ( ) { for ( runIndex = 0 ; runIndex < sampleSize ; runIndex ++ ) { fn . call ( child ) } setTimeout ( finishChild , 0 ) }
Run the current child's test function synchronously.
Run the current child s test function synchronously .