}
  }

  public void testParseLong() {
    assertThat(UnsignedLongs.parseUnsignedLong("18446744073709551615"))
        .isEqualTo(0xffffffffffffffffL);
    assertThat(UnsignedLongs.parseUnsignedLong("9223372036854775807"))
        .isEqualTo(0x7fffffffffffffffL);
    assertThat(UnsignedLongs.parseUnsignedLong("18382112080831834642"))
        .isEqualTo(0xff1a618b7f65ea12L);

        if (isAndroid && a == -4294967296L && b == 2147483648L) {
          /*
           * Bug in older versions of Android we test against, since fixed: -9223372036854775808L /
           * -4294967296L = -9223372036854775808L!
           *
           * To be clear, this bug affects not the test's computation of the expected result but the
           * _actual prod code_. But it probably affects only unusual cases.

          assertEquals(expected, BigIntegerMath.divide(p, q, mode));
        }
      }
    }
  }

  private static final BigInteger BAD_FOR_ANDROID_P = new BigInteger("-9223372036854775808");
  private static final BigInteger BAD_FOR_ANDROID_Q = new BigInteger("-1");

  @GwtIncompatible // TODO
  @AndroidIncompatible // slow
  public void testDivNonZeroExact() {