Friday, March 14, 2008

BDD - Uncle Bob's Stable State

In a TDD thread on tests as specifications there was a link to Uncle Bob talking about Stable State: An Emergent Rule, an excerpt is:

If you look carefully at the specification of the Bowling Game you will see that the state of the Game is changed only by the setup block within the context blocks. The specify blocks simply interrogate and verify state. This is in stark contrast to the JUnit tests in which the test methods both change and verify the state of the Game.

Really its the same idea as some people practicing BDD have, keep the test/specification methods small and preferably just doing Assertions (or mock verifications I guess).

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