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Pull Request: End-to-End Invoice Lifecycle Integration Tests

Overview

This PR adds comprehensive integration tests that exercise the full protocol workflow and assert cross-module consistency (invoice/bid/escrow/investment/settlement) plus key negative cases.

Branch

  • Branch: feature/e2e-invoice-lifecycle-tests
  • Base: main

Changes

1. Integration Test File (quicklendx-contracts/tests/invoice_lifecycle_e2e.rs)

Added 9 comprehensive E2E tests validating the complete invoice lifecycle:

Test Lines Purpose Modules
test_complete_invoice_lifecycle_happy_path ~80 Full workflow from KYC to settlement All
test_concurrent_invoice_operations ~80 Multi-invoice isolation All
test_partial_payment_to_settlement ~60 Partial payment flow Settlement, Invoice
test_kyc_rejection_blocks_workflow ~30 Negative: KYC validation Verification, Invoice
test_invalid_bid_rejected ~30 Negative: Bid validation Bid, Invoice
test_escrow_refund_atomicity ~50 Refund flow atomicity Escrow, Bid, Investment
test_settlement_accounting_identity ~40 Accounting invariants Settlement, Fees
test_status_transitions_are_atomic ~35 Atomicity on failures All
test_cross_module_pointer_integrity ~30 Data integrity All

Total: ~435 lines of test code

2. Documentation Update (docs/contracts/lifecycle.md)

Added Section 7 documenting the E2E test suite:

  • Test coverage matrix with purposes
  • Security validation details
  • Running instructions

Security Impact

Threat Model

  1. Cross-Module Inconsistency: Different modules report conflicting invoice states

    • Mitigation: E2E tests verify all modules agree after every transition

  2. Partial State on Failure: Transaction failure leaves inconsistent state

    • Mitigation: Atomicity tests confirm no partial writes occur

  3. Authorization Bypass: Operations executed without proper auth

    • Mitigation: Tests verify auth requirements at each step

  4. Accounting Drift: investor_return + platform_fee ≠ total_paid

    • Mitigation: Settlement tests assert accounting identity

Security Invariants Validated

  1. Status Alignment: Invoice, bid, investment, and escrow statuses are consistent
  2. No Orphan Pointers: All cross-module references point to valid records
  3. Count Conservation: total_invoice_count == Σ status_buckets
  4. Index Membership: Invoices appear in correct status indices only
  5. Funded-Amount Agreement: invoice.funded_amount == bid.amount == investment.amount == escrow.amount
  6. Terminal State Immutability: Terminal states cannot be transitioned from

Testing Strategy

Test Coverage Areas

  1. Happy Path: Complete workflow from creation to settlement
  2. Multi-Invoice Isolation: Concurrent operations don't cross-contaminate
  3. Partial Payments: Payment flow leading to auto-settlement
  4. KYC Validation: Unverified entities cannot participate
  5. Bid Validation: Invalid bids are rejected
  6. Refund Atomicity: All modules updated together or not at all
  7. Accounting Identity: Settlement math is correct
  8. Atomicity: Failures don't leave partial state
  9. Pointer Integrity: Cross-module references remain valid

Running Tests

# Run all E2E lifecycle tests
cd quicklendx-contracts
cargo test --test invoice_lifecycle_e2e --verbose

# Run specific test
cargo test test_complete_invoice_lifecycle_happy_path --verbose

# Run with coverage
cargo tarpaulin --test invoice_lifecycle_e2e --output-dir ./tarpaulin-report --output Html

Expected Test Output

All 9 tests should pass:

test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

Code Quality

  • NatSpec-style comments: All test functions have comprehensive doc comments
  • Helper functions: Reusable setup functions reduce duplication
  • Clear assertions: Each assertion includes descriptive messages
  • Consistent patterns: Tests follow existing codebase conventions
  • Security-focused: Tests specifically target exploitable inconsistencies

Checklist

  • E2E test for complete invoice lifecycle happy path
  • E2E test for multi-invoice isolation
  • E2E test for partial payment to settlement
  • E2E test for KYC rejection blocking workflow
  • E2E test for invalid bid rejection
  • E2E test for escrow refund atomicity
  • E2E test for settlement accounting identity
  • E2E test for status transition atomicity
  • E2E test for cross-module pointer integrity
  • Updated lifecycle documentation
  • NatSpec-style doc comments on all test functions
  • Conventional commit message
  • Branch pushed to remote

Related Issues

This PR addresses the requirement for:

  • Integration-style tests exercising full protocol workflow
  • Cross-module consistency validation
  • Key negative case coverage
  • Secure, tested, and documented implementation

Reviewers

Please focus on:

  1. Security: Are there any bypass vectors for auth or state consistency?
  2. Completeness: Do the tests cover all critical workflow paths?
  3. Correctness: Are the cross-module invariants properly validated?
  4. Maintainability: Are the tests clear and well-documented?

Next Steps

After review and approval:

  1. Merge to main branch
  2. Deploy to testnet for integration testing
  3. Monitor for any cross-module consistency issues in production

PR Created: 2026-04-24
Author: Praiz Francis
Commit: 99577ba