Topic
Using tests to establish behavior before implementation and preserving them through design changes.
3 pages
Writing
Boundary testing questions concern evidence, isolation, failures, and release confidence. Compare the practice with mocks, TDD, generated checks, formal models, and production observation.
Writing
A stable Domain Facade lets acceptance scenarios and assertions survive internal refactoring. Adapt test support behind unchanged observations and adopt complete boundary tests feature by feature.
Writing
Test whole features through the public surface so regression tests survive later design changes. Class mocks bind tests to internals; transport doubles cover rare external failures.