Creating unitary tests in Spring 3

Question

I\'m starting on testing applications in general and I want to create several tests to learn Mockito in Spring. I\'ve been reading several information but I have some general do

Answer 1

@RunWith(MockitoJUnitRunner.class)

With this declaration you are suppose to write a unit test. Unit tests are exercising a single class mocking all dependencies. Typically you will inject mocked dependencies declared like this in your test case:

@Mock
private YourDependency yourDependencyMock;

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@RunWith(SpringJUnit4ClassRunner.class)

Spring runner is meant for integration test (component test?) In this type of tests you are exercising a whole bunch of classes, in other words you are testing a single class with real dependencies (testing a controller with real services, DAOs, in-memory database, etc.)

You should probably have both categories in your application. Althought it is advices to have more unit tests and only few smoke integration tests, but I often found myself more confident writing almost only integration tests.

As for your second question, you should have:

• unit tests for each class (controller, services, DAOs) separately with mocked all other classes

• integration tests for a whole single CRUD operation. For instance creating a user that exercises controller, service, DAO and in-memory database.