Testing · Senior · Question 7 of 75

What is the classical vs mockist (London school) TDD difference?

✓Correct answer: Classical uses real objects and verifies state; mockist mocks all collaborators and verifies interactions
2Classical writes tests after the code, mockist before
3Mockist TDD doesn't use assertions

Explanation

Mockist tests couple to the call structure and break on refactoring; classical tests can fail in several places for one bug.

Further reading

Martin Fowler: Mocks Aren't Stubs ↗

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