for (RoundingMode mode : ALL_ROUNDING_MODES) {
        assertEquals(ZERO, BigIntegerMath.divide(ZERO, q, mode));
      }
    }
  }

  @GwtIncompatible // TODO
  public void testDivByZeroAlwaysFails() {
    for (BigInteger p : ALL_BIGINTEGER_CANDIDATES) {
      for (RoundingMode mode : ALL_ROUNDING_MODES) {
        assertThrows(ArithmeticException.class, () -> BigIntegerMath.divide(p, ZERO, mode));
      }

    for (int q : NONZERO_INTEGER_CANDIDATES) {
      for (RoundingMode mode : ALL_ROUNDING_MODES) {
        assertEquals(0, IntMath.divide(0, q, mode));
      }
    }
  }

  public void testDivByZeroAlwaysFails() {
    for (int p : ALL_INTEGER_CANDIDATES) {
      for (RoundingMode mode : ALL_ROUNDING_MODES) {
        assertThrows(ArithmeticException.class, () -> IntMath.divide(p, 0, mode));
      }
    }
  }