Chapter 4 – Test Techniques
Outside-In TDD (London School) – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A style of test-driven development that starts from high-level acceptance tests and drives design inward using mocks.
In simple words
Start with a big user-level test, then mock your way down to units.
Exam tip
London-school TDD relies heavily on mocks; classicist TDD prefers real objects.
Related terms
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