feat(#93): Add comprehensive test suite for WalletContext connect, disconnect, and error states

[OZILSOLAR]

PR Description

Overview

This PR implements comprehensive test coverage for WalletContext as specified in issue #93, ensuring wallet state management is robust and reliable across connect, disconnect, and error scenarios.

Changes Implemented

New Test File

• src/contexts/__tests__/WalletContext.test.tsx (149 lines)
  • Comprehensive test suite for WalletContext provider state machine
  • Uses @testing-library/react for component testing
  • Implements fake timers to test async connection flow

Test Coverage

1. connect() State Management

• ✅ Verifies isConnecting is set to true immediately upon connection attempt
• ✅ Confirms connection resolves to mocked wallet address after simulated 1000ms delay
• ✅ Validates isConnecting returns to false after successful connection

2. disconnect() Functionality

• ✅ Confirms address is cleared when disconnect() is invoked
• ✅ Validates state properly transitions after disconnect

3. Error State Reset

• ✅ Ensures error state is reset to null when a new connect() is called
• ✅ Prevents stale error messages from interfering with subsequent connections

4. Provider Guard

• ✅ Tests that calling useWallet() outside WalletProvider throws documented error: "useWallet must be used within a WalletProvider"
• ✅ Verifies error boundary behavior

Technical Details

• Uses Jest fake timers (useFakeTimers()) to control async timing
• Implements test consumer component WalletConsumer to access context values
• Unmocks global WalletContext mock to test real provider behavior
• Uses data-testid for reliable element queries
• Properly cleans up timers after each test

Verification

• ✅ All 4 tests pass
• ✅ Build succeeds without errors
• ✅ ESLint passes with no warnings or errors
• ✅ No breaking changes to existing code

Testing

• Run tests: npm test -- src/contexts/__tests__/WalletContext.test.tsx
• All tests passing: 4/4 ✓

Closes #93

[mikewheeleer]

really thorough suite for the wallet connect/disconnect/error states, appreciate the care here. lgtm 🙌