I'm trying to mock a private method of my service with powermock by passing it the mockito matcher "eq" for its arguments. One of those argument is annotated with the #NotNull decorator from jetbrains.
When I run the test, I get the following error:
java.lang.IllegalArgumentException: Argument for #NotNull parameter X of Y must not be null
Target for testing
import org.jetbrains.annotations.NotNull;
...
class Service {
...
private Map<String, Object> computeDataModel(User user, #NotNull Configuration configuration, Object providedDataModel) {...
}
Test Class
PowerMockito.when(service, "computeDataModel", eq(user), eq(configuration), eq(providedDataModel)).thenReturn(dataModel);
I also tried with any(Configuration.class) but without success.
Do you know how to process ?
Thank you for your attention
This has nothing to do with the annotation really, but with calling the real method with null values.
PowerMockito.when(service, "computeDataModel", eq(user), eq(configuration), eq(providedDataModel))
.thenReturn(dataModel);
calls the real method.
eq is a matcher and returns null, effectively calling your method with 3 null arguments.
If you want to avoid calling your real method, you could use a different method of PowerMockito:
PowerMockito.doReturn(dataModel)
.when(service, "computeDataModel", eq(user), eq(configuration), eq(providedDataModel));
I'm trying to get to grips with EasyMock to mock some calls to Jersey client APIs...
I'm trying to mock a call to the following call Builder API:
<T> T post(Entity<?> entity, Class<T> responseType);
doing the following:
EasyMock.expect(mockInvocationBuilder.post(Entity.json(request), Response.class)).andReturn(mockResponse).anyTimes();
this is giving me the following error:
java.lang.AssertionError:
Unexpected method call Builder.post(Entity{entity=com.ibm.apin.apim.request.CreateOrgRequest#936a7073, variant=Variant[mediaType=application/json, language=null, encoding=null], annotations=[]}, class javax.ws.rs.core.Response):
Can anyone see what I'm doing wrong here and how I can mock this correctly?
See EasyMock User Guide:
To match an actual method call on the Mock Object with an expectation, Object arguments are by default compared with equals().
You have to override equals(), use a built-in argument matcher (like EasyMock#anyObject), write your own IArgumentMatcher or use a Capture.
I have a scenario where I have to set a property of a mocked object as follows:
SlingHttpRequest slingHttpRequest= mock(SlingHttpRequest);
slingHttpRequest.setAttribute("search", someObject);
When I try to print this attribute I get null. How do I set this property?
You don't normally set properties on your mocked objects; instead, you do some specific thing when it's invoked.
when(slingHttpRequest.getAttribute("search")).thenReturn(someObject);
I'm afraid you're misusing your mock SlingHttpRequest.
Mockito requires you to wire up your mock's properties before you use them in your test scenarios, i.e.:
Mockito.when(slingHttpRequest.getAttribute("search")).thenReturn(new Attribute());
You cannot call the setAttribute(final Attribute a) method during the test like so:
slingHttpRequest.setAttribute(someObject);
If you do this, when the test runs, getAttribute() will return null.
Incidently, if the code you are unit testing is going to call a setter on your mock in this way, do not use a mock. Use a stub.
Mock object is not where you store data, it's for you to teach the behavior when its methods are invoked.
try this: https://www.google.com/search?q=mockito+example&oq=mockito+example&aqs=chrome..69i57j0l5.6790j0j7&sourceid=chrome&espv=210&es_sm=93&ie=UTF-8
I'm probable 7 years late for the party, but I still would like to contribute.
You CAN set class property using the Whitebox from powermock:
Whitebox.setInternalState(mockedClass, "internalField", "Value to be returned")
I would like to verify if a parameter of a mocked object is correctly mapped (before the methodcall there is a mapping).
I've created two objects, one of which has the expected values.
I expect the false one to fail, but somehow easymock does not verify if the parameter contains the expected values. How can I fix that?
Real class does:
public SomeObject methodname() {
MyClass parameter = mapper.map(source,Dest.class);
serviceBeingMocked.doSomething(parameter); //<-- want to verify this parameter
}
Test
MyClass correct = ...;
correct.setA=a;
correct.setB=b;
expect(serviceBeingMocked(correct)).andReturn(iDontCare); //this should work
MyClass false = ...;
false.setA=eeeeeeeeeee;
false.setB=ffffffffff;
expect(serviceBeingMocked(false)).andReturn(iDontCare); // this test should fail
Thanks in advance!
Edit: Found the answer (using capture to record the paramter and test the values via assert)
Capture paramter = new Capitre();
expect(serviceBeingMocked(EasyMock.capture(parameter)));
assertEquals(parameter.getValue().getWhatever().equals(correct.getWhatever());
If I understand correctly, this test is a test foe methodname(). And you would like to test that, given a source, the correct MyClass paremeter is created by the mapper, and passed to serviceBeingMocked.doSomething().
So in fact, your unit test for methodname() actually tests the mapper.map() method. That's wrong. You should write a unit test for mapper.map() to test that. Once you've ensured that mapper.map() works as expected, you can test methodname() by mocking the mapper.map() method, and verify that the result of this mocked method is passed to the mocked service (although this test wouldn't add much value).
To be complete, if you really want to go your way and check the value passed to serviceBeingMocked(), then you should use a capture.
I'm using Mockito 1.9.0. I want mock the behaviour for a single method of a class in a JUnit test, so I have
final MyClass myClassSpy = Mockito.spy(myInstance);
Mockito.when(myClassSpy.method1()).thenReturn(myResults);
The problem is, in the second line, myClassSpy.method1() is actually getting called, resulting in an exception. The only reason I'm using mocks is so that later, whenever myClassSpy.method1() is called, the real method won't be called and the myResults object will be returned.
MyClass is an interface and myInstance is an implementation of that, if that matters.
What do I need to do to correct this spying behaviour?
Let me quote the official documentation:
Important gotcha on spying real objects!
Sometimes it's impossible to use when(Object) for stubbing spies. Example:
List list = new LinkedList();
List spy = spy(list);
// Impossible: real method is called so spy.get(0) throws IndexOutOfBoundsException (the list is yet empty)
when(spy.get(0)).thenReturn("foo");
// You have to use doReturn() for stubbing
doReturn("foo").when(spy).get(0);
In your case it goes something like:
doReturn(resultsIWant).when(myClassSpy).method1();
In my case, using Mockito 2.0, I had to change all the any() parameters to nullable() in order to stub the real call.
My case was different from the accepted answer. I was trying to mock a package-private method for an instance that did not live in that package
package common;
public class Animal {
void packageProtected();
}
package instances;
class Dog extends Animal { }
and the test classes
package common;
public abstract class AnimalTest<T extends Animal> {
#Before
setup(){
doNothing().when(getInstance()).packageProtected();
}
abstract T getInstance();
}
package instances;
class DogTest extends AnimalTest<Dog> {
Dog getInstance(){
return spy(new Dog());
}
#Test
public void myTest(){}
}
The compilation is correct, but when it tries to setup the test, it invokes the real method instead.
Declaring the method protected or public fixes the issue, tho it's not a clean solution.
The answer by Tomasz Nurkiewicz appears not to tell the whole story!
NB Mockito version: 1.10.19.
I am very much a Mockito newb, so can't explain the following behaviour: if there's an expert out there who can improve this answer, please feel free.
The method in question here, getContentStringValue, is NOT final and NOT static.
This line does call the original method getContentStringValue:
doReturn( "dummy" ).when( im ).getContentStringValue( anyInt(), isA( ScoreDoc.class ));
This line does not call the original method getContentStringValue:
doReturn( "dummy" ).when( im ).getContentStringValue( anyInt(), any( ScoreDoc.class ));
For reasons which I can't answer, using isA() causes the intended (?) "do not call method" behaviour of doReturn to fail.
Let's look at the method signatures involved here: they are both static methods of Matchers. Both are said by the Javadoc to return null, which is a little difficult to get your head around in itself. Presumably the Class object passed as the parameter is examined but the result either never calculated or discarded. Given that null can stand for any class and that you are hoping for the mocked method not to be called, couldn't the signatures of isA( ... ) and any( ... ) just return null rather than a generic parameter* <T>?
Anyway:
public static <T> T isA(java.lang.Class<T> clazz)
public static <T> T any(java.lang.Class<T> clazz)
The API documentation does not give any clue about this. It also seems to say the need for such "do not call method" behaviour is "very rare". Personally I use this technique all the time: typically I find that mocking involves a few lines which "set the scene" ... followed by calling a method which then "plays out" the scene in the mock context which you have staged... and while you are setting up the scenery and the props the last thing you want is for the actors to enter stage left and start acting their hearts out...
But this is way beyond my pay grade... I invite explanations from any passing Mockito high priests...
* is "generic parameter" the right term?
One more possible scenario which may causing issues with spies is when you're testing spring beans (with spring test framework) or some other framework that is proxing your objects during test.
Example
#Autowired
private MonitoringDocumentsRepository repository
void test(){
repository = Mockito.spy(repository)
Mockito.doReturn(docs1, docs2)
.when(repository).findMonitoringDocuments(Mockito.nullable(MonitoringDocumentSearchRequest.class));
}
In above code both Spring and Mockito will try to proxy your MonitoringDocumentsRepository object, but Spring will be first, which will cause real call of findMonitoringDocuments method. If we debug our code just after putting a spy on repository object it will look like this inside debugger:
repository = MonitoringDocumentsRepository$$EnhancerBySpringCGLIB$$MockitoMock$
#SpyBean to the rescue
If instead #Autowired annotation we use #SpyBean annotation, we will solve above problem, the SpyBean annotation will also inject repository object but it will be firstly proxied by Mockito and will look like this inside debugger
repository = MonitoringDocumentsRepository$$MockitoMock$$EnhancerBySpringCGLIB$
and here is the code:
#SpyBean
private MonitoringDocumentsRepository repository
void test(){
Mockito.doReturn(docs1, docs2)
.when(repository).findMonitoringDocuments(Mockito.nullable(MonitoringDocumentSearchRequest.class));
}
Important gotcha on spying real objects
When stubbing a method using spies , please use doReturn() family of methods.
when(Object) would result in calling the actual method that can throw exceptions.
List spy = spy(new LinkedList());
//Incorrect , spy.get() will throw IndexOutOfBoundsException
when(spy.get(0)).thenReturn("foo");
//You have to use doReturn() for stubbing
doReturn("foo").when(spy).get(0);
I've found yet another reason for spy to call the original method.
Someone had the idea to mock a final class, and found about MockMaker:
As this works differently to our current mechanism and this one has different limitations and as we want to gather experience and user feedback, this feature had to be explicitly activated to be available ; it can be done via the mockito extension mechanism by creating the file src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker containing a single line: mock-maker-inline
Source: https://github.com/mockito/mockito/wiki/What%27s-new-in-Mockito-2#mock-the-unmockable-opt-in-mocking-of-final-classesmethods
After I merged and brought that file to my machine, my tests failed.
I just had to remove the line (or the file), and spy() worked.
One way to make sure a method from a class is not called is to override the method with a dummy.
WebFormCreatorActivity activity = spy(new WebFormCreatorActivity(clientFactory) {//spy(new WebFormCreatorActivity(clientFactory));
#Override
public void select(TreeItem i) {
log.debug("SELECT");
};
});
As mentioned in some of the comments, my method was "static" (though being called on by an instance of the class)
public class A {
static void myMethod() {...}
}
A instance = spy(new A());
verify(instance).myMethod(); // still calls the original method because it's static
Work around was make an instance method or upgrade Mockito to a newer version with some config: https://stackoverflow.com/a/62860455/32453
Bit late to the party but above solutions did not work for me , so sharing my 0.02$
Mokcito version: 1.10.19
MyClass.java
private int handleAction(List<String> argList, String action)
Test.java
MyClass spy = PowerMockito.spy(new MyClass());
Following did NOT work for me (actual method was being called):
1.
doReturn(0).when(spy , "handleAction", ListUtils.EMPTY_LIST, new String());
2.
doReturn(0).when(spy , "handleAction", any(), anyString());
3.
doReturn(0).when(spy , "handleAction", null, null);
Following WORKED:
doReturn(0).when(spy , "handleAction", any(List.class), anyString());