} else {
        System.err.println("No main for $className")
      }
    } catch (ite: InvocationTargetException) {
      if (!expectedFailure(className, ite.cause!!)) {
        throw ite.cause!!
      }
    }
  }

  @Suppress("UNUSED_PARAMETER")
  private fun expectedFailure(
    className: String,
    cause: Throwable,
  ): Boolean =
    when (className) {

    private final Object monitor = new Object();

    MockCallback(String expectedValue) {
      this.value = expectedValue;
    }

    MockCallback(Throwable expectedFailure) {
      this.failure = expectedFailure;
    }

    @Override
    public void onSuccess(String result) {
      synchronized (monitor) {
        assertFalse(wasCalled);
        wasCalled = true;

    private final Object monitor = new Object();

    MockCallback(String expectedValue) {
      this.value = expectedValue;
    }

    MockCallback(Throwable expectedFailure) {
      this.failure = expectedFailure;
    }

    @Override
    public void onSuccess(String result) {
      synchronized (monitor) {
        assertFalse(wasCalled);
        wasCalled = true;