JUnit4 support for in-memory tests in order to use @BeforeClass

[Alfonso Mateos Alarcón]

Hi guys,

I'm mocking my serviceTasks in order to test my process, but digging into Mock.register I saw that it's using a static Map.

So it seems that I could intialize and register my mocks just once, and not in every test method. If so, I would greatly improve the readability of my tests.

So I'm wondering if I could use a method that would be executed just once at the very beginning of my test, just as @BeforeClass does for JUnit4. 

Since ProcessEngineTestCase extends TestCase, it seems that I cannot use that annotation.

Do you have any hint to do so? I thought about the possibility of instantiating taskService, processEngine, etc. on my own, but ProcessEngineTestCase include more features than this...

[Martin Schimak]

Hi,

Instead of ProcessEngineTestCase with junit4 you can use ProcessEngineRule

  @Rule

  public ProcessEngineRule processEngineRule = new ProcessEngineRule();

The rule will make available everything you need pretty much like ProcessEngineTestCase.

However, I would also recommend to register the mocks in a @Before annotated method (or setUp() for JUnit 3), not @BeforeClass, so something like...

 @Mock

  Strategy myStrategy;

 @Before

  public void setUp() {

    MockitoAnnotations.initMocks( this );

    Mocks.register("myStrategy", myStrategy);

  }

… since the mocks always need to be registered in the same thread the test method uses - so this also works in case you use a multithreaded test runner. Even more important: you will want to set up mock behavior and verify expectations on your mocks (like called methods), but don't want your test methods to interfere with each other by using shared mock instances.

Many greetings,

Martin. 

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[Alfonso Mateos Alarcón]

Thanks a lot, Martin! I didn't consider that issue about threads...

@Mock is from Mockito, isn't it? By the way, did you use @InjectMocks in order to inject mocks inside an instance too? 

Thanks in advance!

[Martin Schimak]

@Mock is Mockito, yes. I haven't yet used @InjectMocks when using Mockito with camunda. Many greetings, Martin.

PS: You also might want to check out https://github.com/camunda/camunda-bpm-assert when writing junit tests for camunda. ;-)

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[Alfonso Mateos Alarcón]

Thanks a lot, Martin, understood ;-)

There's a little issue yet, and it's about deployment... Inside ProcessEngineTestCase I find the following line:

   deploymentId = TestHelper.annotationDeploymentSetUp(processEngine, getClass(), getName());

That is supposed to deal with the annotation @Deployment(resources = "diagrams/myProcessDiagram.bpmn") 

If you could give me any hint about how can I read that annotation from my JUnit4 test that would be really useful.

Thanks a lot in advance  :-)

[Martin Schimak]

Hi,

I am not sure what you mean exactly. You can use the @Deployment annotation with both ProcessEngineTestCase as well as ProcessEngineRule… and you can work with TestHelper and its methods in both cases.

@Test

@Deployment(resources = {"camunda-test-1.bpmn", "camunda-test-2.bpmn"})

public void testHappyPath() {

...

}

A full junit 4 example including use of mockito you e.g. find here: https://github.com/camunda/camunda-bpm-assert/blob/master/camunda-bpm-assert-examples/src/test/java/org/camunda/bpm/engine/test/assertions/examples/JobAnnouncementProcessTest.java

Martin.

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