This is my little script for stress-testing a Dart program. Change `script_to_run.dart` to the name of the Dart script to run. Make sure that script ends with a non-zero exit code to indicate failure.

stress.dart

import 'dart:io';

const MAX_ATTEMPTS = 10000;
const MAX_JOBS = 20;

var total = 0;
var numRunning = 0;

main() {
  for (var i = 0; i < MAX_JOBS; i++) spawnProc();
}

spawnProc() {
  numRunning++;
  Process.run('dart', ['--checked', 'script_to_run.dart']).then((result) {
    total++;
    numRunning--;
    if (result.exitCode != 0) {
      print("$total $numRunning: ${result.exitCode} ${result.stdout}");
    }

    if (total < MAX_ATTEMPTS && numRunning < MAX_JOBS) spawnProc();
  });
}