assertThrows(NumberFormatException.class, () -> UnsignedLongs.decode("-05"));
  }

  public void testParseLongWithRadix() {
    assertThat(UnsignedLongs.parseUnsignedLong("ffffffffffffffff", 16))
        .isEqualTo(0xffffffffffffffffL);
    assertThat(UnsignedLongs.parseUnsignedLong("1234567890abcdef", 16))
        .isEqualTo(0x1234567890abcdefL);
  }

    assertThrows(NumberFormatException.class, () -> UnsignedLongs.decode("-05"));
  }

  public void testParseLongWithRadix() {
    assertThat(UnsignedLongs.parseUnsignedLong("ffffffffffffffff", 16))
        .isEqualTo(0xffffffffffffffffL);
    assertThat(UnsignedLongs.parseUnsignedLong("1234567890abcdef", 16))
        .isEqualTo(0x1234567890abcdefL);
  }

        assertEquals("12345678", Hexdump.toHexString(0x12345678L, 8));
        assertEquals("5678", Hexdump.toHexString(0x12345678L, 4));

        // Test negative values (treated as unsigned)
        assertEquals("FFFFFFFFFFFFFFFF", Hexdump.toHexString(-1L, 16));
        assertEquals("FFFFFFFF", Hexdump.toHexString(-1L, 8));
        assertEquals("FFFF", Hexdump.toHexString(-1L, 4));
    }

    @Test