Comprehensive testing suite #48
Description
Implement full test coverage for production release.
Requirements
- Unit tests for all core modules
- Integration tests for MQTT functionality
- End-to-end CLI tests
- TUI component tests
- Error scenario testing
- Performance benchmarks
Acceptance Criteria
- >90% code coverage with unit tests
- All CLI commands have integration tests
- MQTT connection edge cases tested
- TUI components tested independently
- Performance regression tests
- CI runs all tests automatically