### Question:
TransactionProcessor { @Nullable public String serialize() throws TransactionSerializeError { if (this.serializedTransaction != null && !this.serializedTransaction.isEmpty()) { return this.serializedTransaction; } try { return this.serializeTransaction(); } catch (TransactionCreateSignatureRequestError transactionCreateSignatureRequestError) { throw new TransactionSerializeError( ErrorConstants.TRANSACTION_PROCESSOR_SERIALIZE_ERROR, transactionCreateSignatureRequestError); } } TransactionProcessor(
            @NotNull ISerializationProvider serializationProvider,
            @NotNull IRPCProvider rpcProvider,
            @NotNull IABIProvider abiProvider,
            @NotNull ISignatureProvider signatureProvider);  TransactionProcessor(
            @NotNull ISerializationProvider serializationProvider,
            @NotNull IRPCProvider rpcProvider,
            @NotNull IABIProvider abiProvider,
            @NotNull ISignatureProvider signatureProvider,
            @NotNull Transaction transaction); void prepare(@NotNull List<Action> actions, @NotNull List<Action> contextFreeActions); void prepare(@NotNull List<Action> actions); boolean sign(); @NotNull PushTransactionResponse broadcast(); @NotNull PushTransactionResponse signAndBroadcast(); @Nullable String toJSON(); @Nullable String serialize(); @Nullable Transaction getTransaction(); @Nullable Transaction getOriginalTransaction(); @NotNull List<String> getSignatures(); @Nullable String getSerializedTransaction(); @NotNull TransactionConfig getTransactionConfig(); void setTransactionConfig(@NotNull TransactionConfig transactionConfig); void setChainId(@Nullable String chainId); void setAvailableKeys(@NotNull List<String> availableKeys); void setRequiredKeys(@NotNull List<String> requiredKeys); boolean isTransactionModificationAllowed(); void setIsTransactionModificationAllowed(boolean isTransactionModificationAllowed);  }### Answer:
@Test public void serialize() { this.mockDefaultSuccessData(); TransactionProcessor processor = createAndPrepareTransaction(this.defaultActions()); assertNotNull(processor); try { String serializedTransaction = processor.serialize(); assertEquals(MOCKED_TRANSACTION_HEX, serializedTransaction); } catch (TransactionSerializeError transactionSerializeError) { transactionSerializeError.printStackTrace(); } }