Sometimes you need to test that some procedure is deterministic, that is, it is done exactly the same way again and again (builder or factory method patterns are examples of that). The production code does exactly the same invocations for the same arguments. In these situations were are not checking the “right” behavior but just the invocation sequence does not change.

You may use a doublex Mock to test that. The first execution “trains” the Mock, the second time verify the same behaviour.

An example:


  • “python-doublex”:

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