@TestOnly
  public boolean waitForAllProcessHandlers(long time, @NotNull TimeUnit unit) {
    final Collection<ExternalJavacProcessHandler> processes;
    synchronized (myRunningProcesses) {
      processes = new ArrayList<>(myRunningProcesses.values());
    }
    for (ProcessHandler handler : processes) {
      if (!handler.waitFor(unit.toMillis(time))) {
        return false;
      }
    }
    return true;
  }
@TestOnly
  public boolean waitForAllProcessHandlers(long time, @NotNull TimeUnit unit)