Missing or Inadequate Test Coverage
1. SessionConfig Class (session_config.py)
Missing Tests:

load_preferred_sessions method has no dedicated unit tests
No tests for file not found scenario
No tests for JSON decode error scenario
No tests for empty or invalid configuration files
2. SessionNotifier Class (session_notifier.py)
Missing Tests:

__init__ method
send_email_notification method
send_telegram_notification method
notify_session_booking method
notify_upcoming_session method
notify_impossible_booking method
3. CrossFitBooker Class (crossfit_booker_functional.py) - Missing Tests
get_auth_headers function (functional version)
prepare_booking_data function
is_bookable_and_preferred function
process_booking_results function
is_upcoming_preferred function
4. CrossFitBooker Class (crossfit_booker.py) - Missing Tests
is_session_bookable method (non-functional version)
_make_request method
5. Integration and Edge Cases
No tests for the main entry point (book_crossfit.py)
Limited testing of error conditions and edge cases for many methods
No performance or stress tests
No tests for concurrent booking scenarios



Test private methods like _make_request through their public interfaces or consider making them protected
Add integration tests for the complete booking flow
Improve edge case coverage in existing tests