### Question:
SerializationUtils { public static long intToUnsignedLong(int value) { return value & (-1L >>> 32); } private  SerializationUtils(); static PublicAccount toPublicAccount(KeyDto keyDto, NetworkType networkType); static Mosaic toMosaic(UnresolvedMosaicBuilder builder); static UnresolvedMosaicId toUnresolvedMosaicId(UnresolvedMosaicIdDto dto); static MosaicId toMosaicId(MosaicIdDto dto); static NamespaceId toNamespaceId(NamespaceIdDto dto); static ByteBuffer fromUnresolvedAddressToByteBuffer(
      UnresolvedAddress unresolvedAddress, NetworkType networkType); static ByteBuffer fromAddressToByteBuffer(Address resolvedAddress); static AddressDto toAddressDto(Address resolvedAddress); static Address toAddress(AddressDto dto); static UnresolvedAddressDto toUnresolvedAddress(
      UnresolvedAddress unresolvedAddress, NetworkType networkType); static UnresolvedAddress toUnresolvedAddress(UnresolvedAddressDto dto); static int byteToUnsignedInt(byte value); static int shortToUnsignedInt(short value); static long intToUnsignedLong(int value); static DataInputStream toDataInput(byte[] payload); static BigInteger toUnsignedBigInteger(AmountDto amountDto); static BigInteger toUnsignedBigInteger(long value); static String toHexString(Hash256Dto dto); static long toUnsignedLong(final BigInteger number); static String toHexString(ByteBuffer buffer); static String toString(ByteBuffer buffer); static byte[] concat(byte[] commonBytes, byte[] transactionBytes); static ByteBuffer toByteBuffer(PublicAccount publicAccount); static SignatureDto toSignatureDto(String signature); static KeyDto toKeyDto(PublicKey publicKey); static PublicKey toPublicKey(KeyDto dto); static VotingKey toVotingKey(VotingKeyDto votingKeyDto); static VotingKeyDto toVotingKeyDto(VotingKey key); static Hash256Dto toHash256Dto(String hash); static UnresolvedMosaicIdDto toUnresolvedMosaicIdDto(UnresolvedMosaicId mosaicId); static MosaicIdDto toMosaicIdDto(MosaicId mosaicId); static FinalizationEpochDto toFinalizationEpochDto(long finalizationEpoch);  }### Answer:
@Test void intToUnsignedLong() { Assertions.assertEquals( ((long) Integer.MAX_VALUE) + 1, SerializationUtils.intToUnsignedLong(Integer.MAX_VALUE + 1)); Assertions.assertEquals(10, SerializationUtils.intToUnsignedLong(10)); Assertions.assertEquals(4294967295L, SerializationUtils.intToUnsignedLong(-1)); }