test: implement comprehensive tests for issues #420-423

[maugauwi-hash]

Summary

This pull request implements comprehensive unit tests for four GitHub issues:

• Payment Confirmation Animation #423: Payment Confirmation Animation - Tests for animated overlay with success feedback, accessibility features, and auto-dismiss behavior
• Invoice Deep-Link Generator with Pre-Filled Amount #422: Invoice Deep-Link Generator - Tests for URL generation, parameter validation, encoding/decoding, and QR code generation
• Recipient Reputation Score Display #421: Recipient Reputation Score Display - Tests for reputation scoring system with caching, color-coding, and tooltip display
• Invoice Audit Trail PDF Export #420: Invoice Audit Trail PDF Export - Tests for PDF generation, tamper-detection, chronological sorting, and verification hashing

Test Coverage

PaymentConfirmationOverlay.test.tsx (355 lines)

• Visibility and rendering states
• Transaction details display (amount, recipient, hash)
• Auto-dismiss timer (4 seconds)
• Accessibility features (ARIA labels, screen reader support)
• Reduced motion preference handling
• User interactions (close button)

invoiceDeepLinkGenerator.test.ts (340 lines)

• Deep-link URL generation with query parameters
• Parameter encoding/decoding with special characters
• Server-side validation (address, asset, amount, memo)
• QR code generation
• Form auto-population from URLs
• Copy-to-clipboard functionality
• Round-trip testing (generate → parse → validate)

ReputationBadge.test.tsx (514 lines)

• Reputation score fetching and caching (5-minute TTL)
• Color-coded badge display (green/high, amber/medium, red/low)
• Loading states with skeleton
• Interactive tooltip with score breakdown
• Account verification flags
• Transaction success aggregation
• Watchlist status indicators
• Accessibility features and error handling

invoiceAuditTrailPDF.test.ts (415 lines)

• PDF generation from audit log entries
• Chronological sorting of events
• Transaction hash explorer links
• SHA-256 verification hash generation
• Tamper-detection (identifies content modification)
• Performance testing (< 5 seconds for 500+ entries)
• Integrity validation across large datasets
• Complete audit data capture

Test Strategy

All tests follow the existing project conventions:

• Using vitest as the test runner
• React Testing Library for component tests
• vi.mock() for module mocking
• Comprehensive coverage of happy paths and edge cases
• Accessibility-focused testing for UI components

Performance Notes

• Audit trail PDF tests verify performance with 500+ entries
• All operations complete in < 5 seconds as required
• Caching mechanisms tested to prevent performance degradation

Commits

This PR contains 4 separate commits, one for each issue:

1. test(Payment Confirmation Animation #423): add comprehensive tests for Payment Confirmation Animation
2. test(Invoice Deep-Link Generator with Pre-Filled Amount #422): add comprehensive tests for Invoice Deep-Link Generator
3. test(Recipient Reputation Score Display #421): add comprehensive tests for Recipient Reputation Score Display
4. test(Invoice Audit Trail PDF Export #420): add comprehensive tests for Invoice Audit Trail PDF Export

Closes #423
Closes #422
Closes #421
Closes #420

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