# Test: Add comprehensive test coverage for Rust and daemon_client

## Summary
This PR adds comprehensive test coverage as a follow-up to the code audit improvements, focusing on Rust unit tests and daemon_client functionality.

## Changes

### Rust Testing (23 new tests)
- ✅ Add comprehensive unit tests for `src/lib.rs`
- ✅ Test AST parsing (decorators, classes, functions)
- ✅ Test file pattern matching and wildcard handling
- ✅ Test directory ignoring logic
- ✅ Test edge cases (empty files, invalid syntax)
- ✅ Test line number accuracy
- ✅ Add `tempfile` dev dependency to `Cargo.toml`

### Python Testing (56 new tests)
- ✅ Add comprehensive test suite for `daemon_client.py` (`tests/test_daemon_client.py`)
  - DaemonClient initialization and validation (5 tests)
  - Request validation (9 tests)
  - Retry logic with exponential backoff (10 tests)
  - Internal methods and socket handling (5 tests)
  - High-level client methods (11 tests)
  - Helper functions and daemon management (16 tests)

## Test Results
- **Total tests**: 205 (182 Python + 23 Rust)
- **All tests passing**: ✅
- **Test coverage increase**: Added 79 new tests in this PR

## Testing
```bash
# Run Python tests
pytest tests/test_daemon_client.py -v

# Run Rust tests
cargo test

# Run all tests
pytest tests/ -v
```

## Commits in this PR
- `404965c` - chore: update Cargo.lock for tempfile dev dependency
- `9180af0` - test: add comprehensive test suite for daemon_client.py
- `a7eeec3` - test: add comprehensive Rust unit test suite

## Checklist
- [x] All tests passing locally
- [x] Code follows project style guidelines
- [x] Tests cover edge cases and error scenarios
- [x] No breaking changes
- [x] Rust tests use proper fixtures with tempfile
- [x] Python tests use comprehensive mocking
- [x] All tests are deterministic and reliable

## Related Issues
Part of the comprehensive code audit initiative to improve test coverage and production readiness.

## Impact
- Increases confidence in Rust AST parsing logic
- Ensures daemon_client reliability with comprehensive error handling tests
- Provides regression protection for core functionality
- Total test count: 205 tests (1281% increase from original 16 tests)
