}

  public void testCheckPositive_negativeLong() {
    assertThrows(
        IllegalArgumentException.class, () -> MathPreconditions.checkPositive("long", -1L));
  }

  public void testCheckPositive_zeroBigInteger() {
    assertThrows(
        IllegalArgumentException.class,
        () -> MathPreconditions.checkPositive("BigInteger", BigInteger.ZERO));
  }

  public void testCheckPositive_positiveBigInteger() {