test: markets err stability

[ositaemmanuel653-netizen]

Pull Request Description

📋 Basic Information

Type of Change

Please select the type of change this PR introduces:

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🧪 Test addition/update
• 🔧 Refactoring (no functional changes)
• ⚡ Performance improvement
• 🔒 Security fix
• 🎨 UI/UX improvement
• 🚀 Deployment/Infrastructure change

Related Issues

Closes #915

Priority Level

• 🔴 Critical (blocking other development)
• 🟡 High (significant impact)
• 🟢 Medium (moderate impact)
• 🔵 Low (minor improvement)

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📝 Detailed Description

What does this PR do?

This PR adds a focused contract error stability test for the markets contract (contracts/markets/tests/err_stab.rs). The test verifies that client-facing ContractError discriminant values remain stable, preventing accidental changes to publicly exposed error codes across future releases.

Why is this change needed?

Applications and integrations rely on stable contract error codes for consistent error handling. Accidentally changing the numeric values associated with ContractError variants could introduce breaking changes for clients without altering the contract interface. This test acts as a regression safeguard by freezing the expected error code mappings.

How was this tested?

• Added a dedicated error stability test in contracts/markets/tests/err_stab.rs.
• Executed the project's standard test suite using cargo test.
• Verified that all existing tests continue to pass and the expected error values remain unchanged.
• Confirmed the test fails if any client-facing error code is modified.

Alternative Solutions Considered

An alternative approach was documenting the expected error values without automated verification. A dedicated regression test was chosen because it provides continuous validation in CI and prevents accidental changes during future development.

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🏗️ Smart Contract Specific

Contract Changes

• Core contract logic modified
• Oracle integration changes (Pyth/Reflector)
• New functions added
• Existing functions modified
• Storage structure changes
• Events added/modified
• Error handling improved
• Gas optimization
• Access control changes
• Admin functions modified
• Fee structure changes

Oracle Integration

• Pyth oracle integration affected
• Reflector oracle integration affected
• Oracle configuration changes
• Price feed handling modified
• Oracle fallback mechanisms
• Price validation logic

Market Resolution Logic

• Hybrid resolution algorithm changed
• Dispute mechanism modified
• Fee structure updated
• Voting mechanism changes
• Community weight calculation
• Oracle weight calculation

Security Considerations

• Access control reviewed
• Input validation
• Reentrancy protection
• Overflow/underflow protection
• Oracle manipulation protection

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🧪 Testing

Test Coverage

• Unit tests added/updated
• Integration tests added/updated
• All tests passing locally
• Manual testing completed
• Oracle integration tested
• Edge cases covered
• Error conditions tested
• Gas usage optimized
• Cross-contract interactions tested

Test Results

cargo test

# Expected output
All tests passed successfully, including the new ContractError stability test.

Manual Testing Steps

1. Run cargo test from the repository root.
2. Verify the new err_stab.rs test passes.
3. Temporarily modify a ContractError discriminant and confirm the stability test fails as expected.

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📚 Documentation

Documentation Updates

• Code comments added/updated
• README updated
• API documentation updated
• Examples updated
• Deployment instructions updated
• Contributing guidelines updated
• Architecture documentation updated

Breaking Changes

Breaking Changes:

• None.

Migration Guide:

No migration required.

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🔍 Code Quality

Code Review Checklist

• Code follows Rust/Soroban best practices
• Self-review completed
• No unnecessary code duplication
• Error handling is appropriate
• Logging/monitoring added where needed
• Security considerations addressed
• Performance implications considered
• Code is readable and well-commented
• Variable names are descriptive
• Functions are focused and small

Performance Impact

• Gas Usage: None (test-only change).
• Storage Impact: None.
• Computational Complexity: No runtime impact on deployed contracts.

Security Review

• No obvious security vulnerabilities
• Access controls properly implemented
• Input validation in place
• Oracle data properly validated
• No sensitive data exposed

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🚀 Deployment & Integration

Deployment Notes

• Network: N/A
• Contract Address: N/A
• Migration Required: No
• Special Instructions: None. This change only affects the test suite.

Integration Points

• Backward compatibility maintained
• Frontend integration considered
• API changes documented
• Third-party integrations updated

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📊 Impact Assessment

User Impact

• End Users: No direct impact.
• Developers: Increased confidence that client-facing error codes remain stable.
• Admins: No impact.

Business Impact

• Revenue: None.
• User Experience: Improves reliability for applications integrating with the markets contract.
• Technical Debt: Reduced through automated regression coverage.

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✅ Final Checklist

Pre-Submission

• Code follows Rust/Soroban best practices
• All CI checks passing
• No breaking changes (or breaking changes are documented)
• Ready for review
• PR description is complete and accurate
• All required sections filled out
• Test results included
• Documentation updated

Review Readiness

• Self-review completed
• Code is clean and well-formatted
• Commit messages are clear and descriptive
• Branch is up to date with main
• No merge conflicts

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📸 Screenshots (if applicable)

N/A

🔗 Additional Resources

• Design Document: N/A
• Technical Spec: Issue Add ContractError stability test for markets (v7) #915
• Related Discussion: GrantFox FWC26 (Stellar Wave)
• External Documentation: N/A

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💬 Notes for Reviewers

Please pay special attention to:

• The completeness of the ContractError stability assertions.
• Whether all client-facing error variants are covered.
• The regression behavior if an error discriminant changes.

Questions for reviewers:

• Are there any additional public error variants that should be included in the stability test?
• Does the current test align with the project's long-term error compatibility strategy?

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Thank you for your contribution to Predictify! 🚀

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[greatest0fallt1me]

Merged via direct push to master (admin)