[mockito] States vs. InOrder verification

[James Carr]

I recently finished up Steve and Nat's book and on thing of interest
that he introcduced was using the concept of states
(http://www.jmock.org/states.html) rather than verifying interactions
occur in order. Essentially, when different interactions occur you can
say that the object is in a certain "state" and then verify that
state. This makes a lot of sense for the same reasons I never ever use
the InOrder verifications in mockito... in my experience InOrder
verifications either indicate some very procedural logic or in the
cases where it might seem to be relevant the tests produced with it
are often very brittle.

After seeing several examples of "state" based verification, I like it
and I keep thinking... how could we introduce a similar feature in
mockito? As another method tacked on to givne/when maybe? Something
like

when(foo.pushDown()).thenStateIs("down");
when(foo.pushDown()).thenStateIs("up");

or

given(foo.pushDown()).thenStateIs("down");
given(foo.pushDown()).thenStateIs("up");

Just a thought.


Thanks,
James

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[Chris Bartling]

On a related note, if you haven't had a chance to read Steve and Nat's book, it quite good.  One of my favorites for 2009.  Well worth the read.

http://www.growing-object-oriented-software.com/

Regards,

-- chris --  

[szczepiq]

Hey

>>
when(foo.pushDown()).thenStateIs("down");
when(foo.pushDown()).thenStateIs("up");

I'm not sure how it fits Mockito. You would need some verification mechanism afterwards, like verifyStates(); Also you need some constraining mechanism for defining states :) like when(foo.pushDown()).inState("down").thenStateIs("up");

It would be good to see a real example where it is useful.

Cheers!
Szczepan