Add unit tests for MVC/Facade/Flyweight/Delegation and small fixes to enable pytest collection #464
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Summary: Add focused unit tests for several low-coverage modules and apply two minimal source fixes so the test suite can be collected and run reliably in CI/local dev.
Why: Running pytest previously failed during collection due to a missing import and missing typing names; these prevented adding tests and measuring coverage. This PR adds tests and the smallest safe changes needed to run them.
What I changed (files):
Added tests:
test_mvc.py
test_facade.py
test_flyweight.py
test_delegation.py
pytest_local.ini (temporary local pytest config to avoid project-wide doctest addopts during targeted runs)
Small source fixes:
mvc.py — removed invalid top-level from ProductModel import Price (module did not exist; file defines its own Price class).
memento.py — added missing typing imports (Any, Type) to avoid NameError during collection.