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How to mock an aspect

I am currently working on some monitoring tool using aspectj. Since this tool should be technology independent (as far as possible), I do not use Spring for injection. But I want my aspects to be tested per unit.

Aspect example:

@Aspect
public class ClassLoadAspect {
    private Repository repository;

    public ClassLoadAspect() {
        repository = OwlApiRepository.getInstance();
    }  

    @After("anyStaticInitialization()")
    public void processStaticInitilization(JoinPoint jp) {
        Class type = jp.getSourceLocation().getWithinType();
        if (type.isInterface()) {
            repository.storeInterfaceInitialization(type);
        } else if (type.isEnum()) {
            repository.storeEnumInitialization(type);
        } else {
            repository.storeClassInitialization(type);
        }

    }

    @Pointcut("staticinitialization(*) && !within(cz.cvut.kbss.odra..*)")
    public void anyStaticInitialization() {
    }

    public Repository getRepository() {
        return repository;
    }

    public void setRepository(Repository repository) {
        this.repository = repository;
    }  
}

However, I really don’t know how to build a unit test (the repository field should be mocked (using mockito)), but I do not have aspect control under control, so I can’t install the dependency manually. What do I need to call to get an instance? Or there is another scenario, like unit-test aspectj aspects.

Thank.

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5 answers

, . ? :

, OwlApiRepository.getInstance() -? mock- ( AspectJ, POJO):

public privileged aspect ClassLoadTestAspect {
    static boolean active = true;

    declare precedence : ClassLoadTestAspect, ClassLoadAspect;
    pointcut classLoadAspect() :
        if(active) && 
        withincode(ClassLoadAspect.new()) && 
        call(* OwlApiRepository.getInstance());

    Object around() : classLoadAspect() {
        return new MockRepository();
    }
}

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  • : AspectJ, .. (). Mockito, . , AspectJ. , " " . , (AJ) (Mockito) .

+2

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+1

AspectJ, factory

@Aspect
public class MockingAspect {

    @Around("call(synchronized static OwlApiRepository *(..))")
    public OwlApiRepository processGetInstance(ProceedingJoinPoint jp) {      
        System.out.println("getting mock");
        return MockHolder.getMock();
    }
}
+1

, ? unit test . (Testng + Mockito)

public class ResourceApplicationExceptionAspectTest {
@Mock
private ProceedingJoinPoint pjp;
@Mock
private ResourceApplicationException resourceApplicationException; //annotation definition

@BeforeMethod
public void setUp() throws Exception {
    MockitoAnnotations.initMocks(this);

}

@Test(groups ="unit", expectedExceptions = ResourceApplicationException.class)
public void testWrapExceptionAdvice() throws Throwable {

    ResourceApplicationExceptionAspect aspect = new ResourceApplicationExceptionAspect();

    when(pjp.proceed()).thenThrow(new NullPointerException());
    aspect.wrapExceptionAdvice(pjp, resourceApplicationException);
}
+1

What about something in this direction, basically keep your aspect, the internal aspect, delegate behavior to another interface and mock this interface for your tests, instead of mocking the aspect itself. Here is the pseudo code:

public interface ClassLoadHelper{
    void processStaticInitialization(Class<?> clazz);
}

public class ClassLoadHelperImpl implements ClassLoadHelper{
    private Repository repository;

    public ClassLoadHelperImpl() {
        repository = OwlApiRepository.getInstance();
    }  

    void processStaticInitialization(Class<?> clazz){
        if (type.isInterface()) {
            this.repository.storeInterfaceInitialization(type);
        } else if (type.isEnum()) {
            this.repository.storeEnumInitialization(type);
        } else {
            this.repository.storeClassInitialization(type);
        }        
    }
}


@Aspect
public class ClassLoadAspect {
    private ClassLoadHelper classLoadHelper;


    @After("anyStaticInitialization()")
    public void processStaticInitilization(JoinPoint jp) {
        Class<?> type = jp.getSourceLocation().getWithinType();
        this.classLoadHelper.processStaticInitialization(type);

    }

    @Pointcut("staticinitialization(*) && !within(cz.cvut.kbss.odra..*)")
    public void anyStaticInitialization() {
    }

    public ClassLoadHelper getClassLoadHelper() {
        return classLoadHelper;
    }

    public void setClassLoadHelper(ClassLoadHelper classLoadHelper) {
        this.classLoadHelper = classLoadHelper;
    }  
}

Now in your test you can do this:

ClassLoadAspect.aspectOf().setClassLoadHelper(mockClassLoadHelper);
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