In antiquity, the Great Pyramid of Giza the only wonder from the original list still standingthe statue of Zeus at Olympia, the Colossus of Rhodes a new gigantic, version of which is being built todayand others were among the occupants of the list. In fact, it is not a single wonder, but a whole list of them, but they all revolve around one question:
Partly this is because many of the leading developers of mock objects have been colleagues of mine at ThoughtWorks at various times. Spies essay example as often as not I see mock objects described poorly. In particular I see them often confused with stubs - a common helper to testing environments.
I understand this confusion - I saw them as similar for a while too, but conversations with the mock developers have steadily allowed a little mock understanding to penetrate my tortoiseshell cranium. This difference is actually two separate differences. On the one hand there is a difference in how test results are verified: On the other hand is a whole different philosophy to the way testing and design play together, which I term here as the classical and mockist styles of Test Driven Development.
The example is in Java, but the principles make sense with any object-oriented language. We want to take an order object and fill it from a warehouse object.
The order is very simple, with only one product and a quantity. The warehouse holds inventories of different products. When we ask an order to fill itself from a warehouse there are two possible responses.
These two behaviors imply a couple of tests, these look like pretty conventional JUnit tests. In this case the setup phase is done partly in the setUp method setting up the warehouse and partly in the test method setting up the order.
The call to order. This is where the object is prodded to do the thing that we want to test. The assert statements are then the verification stage, checking to see if the exercised method carried out its task correctly. During setup there are two kinds of object that we are putting together.
Order is the class that we are testing, but for Order. In this situation Order is the object that we are focused on testing. Testing-oriented people like to use terms like object-under-test or system-under-test to name such a thing. I need the warehouse for two reasons: In the earlier version of this article I referred to the SUT as the "primary object" and collaborators as "secondary objects" This style of testing uses state verification: There are other mock object libraries out there, but this one is an up to date library written by the originators of the technique, so it makes a good one to start with.
To begin with, the setup phase is very different.
The difference is in the objects that are created. The SUT is the same - an order. The second part of the setup creates expectations on the mock object. The expectations indicate which methods should be called on the mocks when the SUT is exercised.
Once all the expectations are in place I exercise the SUT. After the exercise I then do verification, which has two aspects. I run asserts against the SUT - much as before. However I also verify the mocks - checking that they were called according to their expectations.
The key difference here is how we verify that the order did the right thing in its interaction with the warehouse. Mocks use behavior verification, where we instead check to see if the order made the correct calls on the warehouse. We do this check by telling the mock what to expect during setup and asking the mock to verify itself during verification.
In the second test I do a couple of different things. Firstly I create the mock differently, using the mock method in MockObjectTestCase rather than the constructor.% FREE Papers on Dawn of spies essays. Sample topics, paragraph introduction help, research & more.
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