}

  public void testCheckNonNegative_zeroBigInteger() {
    MathPreconditions.checkNonNegative("BigInteger", BigInteger.ZERO);
  }

  public void testCheckNonNegative_positiveBigInteger() {
    MathPreconditions.checkNonNegative("BigInteger", BigInteger.ONE);
  }

  public void testCheckNonNegative_negativeBigInteger() {
    assertThrows(
        IllegalArgumentException.class,