Function createMockChild

src/utils/__tests__/simulator-steps-pid.test.ts:28–52

(exitCode: number | null = null)

const trackedChildren = new Map<number, ChildProcess>();

function createMockChild(exitCode: number | null = null): ChildProcess {
  const emitter = new EventEmitter();
  const child = emitter as unknown as ChildProcess;
  let currentExitCode = exitCode;
  const pid = nextPid++;
  Object.defineProperty(child, 'exitCode', {
    get: () => currentExitCode,
    set: (value: number | null) => {
      currentExitCode = value;
    },
    configurable: true,
  });
  child.unref = vi.fn();
  trackedChildren.set(pid, child);
  child.kill = vi.fn((signal?: NodeJS.Signals | number) => {
    currentExitCode = 0;
    queueMicrotask(() => {
      emitter.emit('exit', 0, signal);
      emitter.emit('close', 0, signal);
    });
    return true;
  }) as ChildProcess['kill'];
  Object.defineProperty(child, 'pid', { value: pid, writable: true });
  return child;
}

function createMockSpawner() {
  return (_command: string, _args: string[], _options: SpawnOptions): ChildProcess => {