for (int m : POSITIVE_INTEGER_CANDIDATES) {
        assertEquals(valueOf(x).mod(valueOf(m)).intValue(), IntMath.mod(x, m));
      }
    }
  }

  public void testModNegativeModulusFails() {
    for (int x : POSITIVE_INTEGER_CANDIDATES) {
      for (int m : NEGATIVE_INTEGER_CANDIDATES) {
        assertThrows(ArithmeticException.class, () -> IntMath.mod(x, m));
      }
    }
  }

      for (long m : POSITIVE_LONG_CANDIDATES) {
        assertEquals(valueOf(x).mod(valueOf(m)).longValue(), LongMath.mod(x, m));
      }
    }
  }

  @GwtIncompatible // TODO
  public void testModNegativeModulusFails() {
    for (long x : ALL_LONG_CANDIDATES) {
      for (long m : NEGATIVE_LONG_CANDIDATES) {
        assertThrows(ArithmeticException.class, () -> LongMath.mod(x, m));
      }
    }
  }