assertThrows(IllegalArgumentException.class, () -> IntMath.gcd(a, 0));
      assertThrows(IllegalArgumentException.class, () -> IntMath.gcd(0, a));
    }
  }

  @AndroidIncompatible // slow
  public void testCheckedAdd() {
    for (int a : ALL_INTEGER_CANDIDATES) {
      for (int b : ALL_INTEGER_CANDIDATES) {
        BigInteger expectedResult = valueOf(a).add(valueOf(b));
        boolean expectedSuccess = fitsInInt(expectedResult);

      assertThrows(IllegalArgumentException.class, () -> LongMath.gcd(a, 0));
      assertThrows(IllegalArgumentException.class, () -> LongMath.gcd(0, a));
    }
  }

  @AndroidIncompatible // slow
  public void testCheckedAdd() {
    for (long a : ALL_LONG_CANDIDATES) {
      for (long b : ALL_LONG_CANDIDATES) {
        BigInteger expectedResult = valueOf(a).add(valueOf(b));
        boolean expectedSuccess = fitsInLong(expectedResult);