### Question:
ByteBufUtils { public static String readIpv6Address(final ByteBuf buf) { final StringBuilder sb = new StringBuilder(EncodeConstants.GROUPS_IN_IPV6_ADDRESS * 5 - 1); appendHexUnsignedShort(sb, buf.readUnsignedShort()); for (int i = 1; i < EncodeConstants.GROUPS_IN_IPV6_ADDRESS; i++) { sb.append(':'); appendHexUnsignedShort(sb, buf.readUnsignedShort()); } return sb.toString(); } private  ByteBufUtils(); static String byteBufToHexString(final ByteBuf bb); static byte[] hexStringToBytes(final String hexSrc); static byte[] hexStringToBytes(final String hexSrc, final boolean withSpaces); static ByteBuf hexStringToByteBuf(final String hexSrc); static void hexStringToByteBuf(final String hexSrc, final ByteBuf out); @Deprecated static void padBuffer(final int length, final ByteBuf out); static void writeOFHeader(final byte msgType, final E message, final ByteBuf out, final int length); static void updateOFHeaderLength(final ByteBuf out); static void updateOFHeaderLength(final ByteBuf out, int index); static int fillBitMaskFromMap(final Map<Integer, Boolean> booleanMap); static int fillBitMask(final int offset, final boolean... values); static int[] fillBitMaskFromList(final List<Boolean> booleanList); static String bytesToHexString(final byte[] array); static byte[] macAddressToBytes(final String macAddress); static String macAddressToString(final byte[] address); static String decodeNullTerminatedString(final ByteBuf rawMessage, final int length); static String readIpv4Address(final ByteBuf buf); static String readIpv6Address(final ByteBuf buf); static Ipv4Address readIetfIpv4Address(final ByteBuf buf); static Ipv6Address readIetfIpv6Address(final ByteBuf buf); static MacAddress readIetfMacAddress(final ByteBuf buf); static byte[] serializeList(final List<Short> list); static final Splitter DOT_SPLITTER; static final Splitter COLON_SPLITTER; }### Answer:
@Test(expected=IndexOutOfBoundsException.class) public void testReadIpv6Address() { ByteBuf buffer = PooledByteBufAllocator.DEFAULT.buffer(); buffer.writeShort(10); buffer.writeShort(65535); buffer.writeShort(4096); buffer.writeShort(0); buffer.writeShort(1024); buffer.writeShort(42); buffer.writeShort(2568); buffer.writeShort(45689); String ipv4Address = ByteBufUtils.readIpv6Address(buffer); Assert.assertEquals("Wrong conversion", "000A:FFFF:1000:0000:0400:002A:0A08:B279", ipv4Address); Assert.assertTrue("Unexpected data", buffer.readableBytes() == 0); ByteBuf buffer2 = PooledByteBufAllocator.DEFAULT.buffer(); buffer.writeShort(10); ipv4Address = ByteBufUtils.readIpv6Address(buffer2); }