PR_RECORD_FEES_VALIDATION.md

PR: Add record_fees Fee Amount Validation

Description

Add validation to the record_fees function to reject negative or invalid fee amounts.

Changes

1. contracts/attestation_engine/src/lib.rs

Added fee amount validation in record_fees function:

if fee_amount < 0 {
    return Err(AttestationError::InvalidFeeAmount);
}

Details:

• Rejects: fee_amount < 0
• Allows: fee_amount >= 0
• Error type: InvalidFeeAmount (existing)

2. tests/integration/cross_contract_tests.rs

Added comprehensive test: test_record_fees_validation

Test Cases:

• ❌ -1 → InvalidFeeAmount
• ✅ 0 → Success
• ✅ 50_000_000 → Success
• ✅ 1_000_000_000_000 → Success
• ❌ i128::MIN → InvalidFeeAmount

Test Results

✅ test_record_fees_validation - PASS ✅ test_record_fees_record_drawdown_access_control - PASS (no regression) ✅ All 11 attestation tests - PASS

Impact

• Files Changed: 2
• Lines Added: 95 (5 implementation + 90 tests)
• Breaking Changes: None
• Regressions: None

Checklist

• Validation rejects negative amounts
• Zero fees allowed (non-negative)
• Positive amounts processed
• All test scenarios pass
• No regressions
• Release build successful