[CONTRACTS] Add unit tests for PaymentDistributorContractService.buildDistributePayoutsTx()

[chizzy192]

Metadata

Field	Value
Domain	Contracts
Difficulty	Easy (1–2 Days)
Effort Estimate	effort: 3h
Priority	P1-High
Labels	good first issue, easy, Stellar Wave
Target Branch	dev
Depends On	#134

🎯 Context & Goal

The PaymentDistributorContractService method buildDistributePayoutsTx() encodes payout fan-out transactions to split settlement proceeds between sellers, investors, and platform fee account.

This issue adds unit tests in tests/unit/services/stellar/payment-distributor-tx.test.ts testing method argument serialization.

📂 Target Files

• tests/unit/services/stellar/payment-distributor-tx.test.ts -> Unit test file
• src/services/stellar/payment-distributor-contract.service.ts -> Distributor service

📋 Implementation Tasks

• Write unit tests for buildDistributePayoutsTx
• Assert contract ID matches PAYMENT_DISTRIBUTOR_CONTRACT_ID
• Test fee basis points (feeBps) serialization

🛠️ Technical Guidance

Use Jest to verify ScVal arguments.

🔗 References & Related

• Payment distributor contract spec

⏳ Delivery Window

This issue should be completed within 2 day(s) of assignment.

Contribution Workflow

1. Branch off dev: git checkout -b feature/descriptive-name dev
2. Implement all tasks in the checklist above.
3. Run all CI checks locally (see DEVELOPMENT.md).
4. Open a Pull Request targeting dev.
5. Link this issue in your PR description: Closes #XX.

✅ Acceptance Criteria

• All implementation tasks above are completed.
• Code compiles/builds without errors.
• All existing tests continue to pass.
• New tests are added with >80% coverage of new code.
• Code follows project style guidelines (formatting, linting).
• PR targets dev branch (NOT main).
• PR description references this issue.
• Documentation is updated if public API changed.

[alhassanisah]

@alhassanisah has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello Maintainer, I've gone through the issue and am confident I can work on the required changes. Kindly assign this issue to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @alhassanisah to this issue.