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POMocking for integration tests
 

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    <p>How does one mock the many dependencies needed for integration tests?</p> <p>I use Mockito for my 'pure' unit tests. 'Pure' in this case means testing a single class, mocking all of it's dependencies. Beautiful.</p> <p>Now come integration tests. Let's say in this case an integration test will test something like this:</p> <ol> <li>Message is put on a queue</li> <li>Message is 'processed'</li> <li>Response message is put on a response queue</li> </ol> <p>Let's also say that the processing that happens in step 2 is serious stuff. It relies on lots of database interactions, on multiple external services, the file system, all kinds of things. There are also a lot of side effects that the flow will trigger, so I cannot simply ensure that the response is correct - I need to verify the side effects.</p> <p>Each of these dependencies are wrapped by a single stateless service class, which makes them nice and mockable.</p> <p>How are folks handling this?</p> <p>I would love to use Mockito so that I could verify the side effects that the above flow will have. However, Mocktio's documentation (and to a large extent it's implementation) seems to fight strongly against using it in contexts other than 'pure' unit tests. I've tried to go this route, but</p> <ul> <li>It's difficult to populate the stub data (as there's lots of it)</li> <li>It's difficult to have Spring inject those stubbed instances into my beans</li> <li>It's difficult to 'reset' the mocks so that I can verify a different set of interactions without clearing out the stubs.</li> </ul> <p><em>EDIT</em></p> <p>I know that I could handle the database issue with something like an HSQLDB instance, but there's still the issue of the external services. For repeatability I can't rely on those services being up, being in the state that I require, etc. The only option I see there is to mock them.</p> <p>Whatdaya do?</p>
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    1. USRoy Truelove
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    1. COJust to clarify, as integration testing can be taken in two ways. It sounds like you mean integration testing as in, testing that connecting components work well together (essentially testing the API's). But, sometimes integration refers to end-to-end, so you would not mock your service and actually allow it to hit the database. This clarification can help with the answer..Please see http://stackoverflow.com/questions/4904096/whats-the-difference-between-unit-functional-acceptance-and-integration-test for further clarification of the types
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      1. USJustin Pihony
    2. COIt really applies to any test (integration or end-to-end) that requires a lot of external dependencies. For instance I could replace my database stubs with an HSQLDB instance, but I still have all of the other services. Will edit the question a bit to clarify..
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