The problem
We all love unit testing and Spring's JavaConfig. And we certainly dig them beans, however for unit testing we need to mock or instantiate our beans with Test @Configuration classes (or reuse existing @Configuration classes).
...
After fixing those, we might see more broken tests ... due to transitive dependencies introduced from the Service we just added and we need to fix them again.
The solution
MockedLoader will automatically mock any bean that is @Autowired, for you - without needing any code in your @Configuration class. The concept is close to the @Mock annotation - with the difference that it gives you more flexibility on how you can interact with the mocked bean.
Example scenario's without MockedLoader
Minimal test case (no beans)
| Code Block | ||
|---|---|---|
| ||
public class TestUtil {
@Test
public void testSomething() throws Exception {
Asset.assertNotNull("something", "something else");
}
}
|
Test Case with one Bean and no other Bean dependencies
This will create one Bean called ApplicationContext - any Bean dependencies it has will need to be declared inside the TestConfig (as required by Spring)
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| Warning |
|---|
It is important to use @DirtiesContext so the @Bean is destroyed after the Test is done |
Test Case with one Bean and other Bean dependencies
This will create 3 Beans and because ServiceWithDependantServices instantiates a concrete class, we need to mock all the dependant services of this class also.
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| Warning |
|---|
Note: This will nullpointer when any @Autowired services inside ServiceWithDependantServices are called, because they won't be @Autowired - not exactly what you want either |
Scenarios using MockedLoader
The first scenario is the same as the previous - except that all @Autowired dependencies from ServiceWithDependantServicesImpl will be automatically mocked.
...
| Code Block | ||
|---|---|---|
| ||
@RunWith( SpringJUnit4ClassRunner.class )
@DirtiesContext(classMode= DirtiesContext.ClassMode.AFTER_CLASS)
@ContextConfiguration( loader = MockedLoader.class )
public class TestUtil {
@Autowired
private ServiceWithDependantServices thisWillBeAutomaticallyMockedByMockedLoader;
@Test
public void testSomething() throws Exception {
Asset.assertNotNull("something", thisWillBeAutomaticallyMockedByMockedLoader.doSomething() );
}
}
|
Download
MockedLoader is part of commons-test and can be included from Maven.