Mockito when method not working

user_1363092 0
Viewed 103020

I am using mockito as mocking framework. I have a scenerio here, my when(abc.method()).thenReturn(value) does not return value, instead it returns null.

public class DQExecWorkflowServiceImplTest {
@InjectMocks
DQExecWorkflowServiceImpl dqExecWorkflowServiceImpl = new DQExecWorkflowServiceImpl();
@Mock
private DQUtility dqUtility;
@Mock
private DqExec dqExec;
@Mock
private DqCntlDefn dqCntlDefn;
@Mock
private DqCntlWfDefn dqCntlWfDefn;
@Mock
private DqCntlWfDefnTyp dqCntlWfDefnTyp;
@Mock
private IDQControlWfDefTypeService controlWfDefTypeService;

@Before
public void setUp() throws Exception {
    dqExec = new DqExec();
    dqCntlWfDefn = new DqCntlWfDefn();
    dqUtility = new DQUtility();
    dqCntlWfDefnTyp = new DqCntlWfDefnTyp();
    dqCntlWfDefnTyp.setDqCntlWfDefnTypCd("MIN_INCLUSIVE_VAL");
    dqExecWorkflowServiceImpl
            .setControlWfDefTypeService(controlWfDefTypeService);

}

@Test
public void testExecuteWorkflow() {
    when(controlWfDefTypeService.getDqCntlWfDefnTypCd(dqCntlWfDefn))
            .thenReturn(dqCntlWfDefnTyp);
    dqExecWorkflowServiceImpl.executeWorkflow(dqExec, dqCntlWfDefn);
}

}

Java class

@Override
public DqCntlWfExec executeWorkflow(final DqExec dqExec,
        final DqCntlWfDefn dqCntlWfDefn) {
final DqCntlWfExec dqCntlWfExec = new DqCntlWfExec();
dqCntlWfExec.setDqCntlWfExecEffDt(dqUtil.getDefaultEffectiveDt());
dqCntlWfExec.setDqCntlWfExecExpDt(dqUtil.getDefaultExpiryDt());
dqCntlWfExec.setDqCntlWfDefn(dqCntlWfDefn);
dqCntlWfExec.setDqExec(dqExec);

final DqCntlWfDefnTyp dqCntlWfDefnTyp = controlWfDefTypeService
    .getDqCntlWfDefnTypCd(dqCntlWfDefn);
     String workflowType = null;
if(null!=dqCntlWfDefnTyp){
    workflowType = dqCntlWfDefnTyp.getDqCntlWfDefnTypCd();
}

When ever i run the test file the when is not working and i am using mockito1.8.5 jar in the buildpath. The service call is being mocked but returns the null value.

final DqCntlWfDefnTyp dqCntlWfDefnTyp = controlWfDefTypeService
    .getDqCntlWfDefnTypCd(dqCntlWfDefn);

This object dqCntlWfDefnTyp is null

I have done this before and there was no problem with the when, It seems to be working with files i have done before. I had followed the same procedure for the test file but i couldnt figure out the issue. Can anyone please assist me

Thanks to all the folks in advance

mockito java
7 Answers

TL;DR If some arguments in your test are null, be sure to mock the parameter call with isNull() instead of any(SomeClass.class).

Explanation

This might not be the answer that helps OP, but might be useful for someone else. In my case the setup was all good, however, some mocks returned the desired thenReturn(...) value and some didn't.

It's important to understand, that the method call you're trying to mock (i.e. the method in when(someMock.methodToMock)) has to match the actual call and not the signature only.

In my case, I mocked a method with a signature:

public void SomeValue method(String string, SomeParam param)

The call however, in the test was something like:

method("some string during test", null);

Now if you mock the call with:

when(MockedClass.method(anyString(), any(SomeParam.class))

Mockito will not match it even though the signature is correct. The problem is that Mockito is looking for a call of method() with the arguments String and SomeParam, whereas the actual call was with a String and null. What you have to do is:

when(MockedClass.method(anyString(), isNull())

Hint

Since there are many isNull() implementations in different frameworks, be sure to use this one org.mockito.ArgumentMatchers.isNull.

user_37058610

Just like Younes EO said: it usually is related to null arguments being passed to mocked functions.

One thing worth adding is that if you're using Kotlin for your tests (and you have mockito-kotlin in your project), for Nullable arguments you should usually use anyOrNull() instead of any().

user_19932040

Relevant to the topic, just in case this helps someone. My mockito.when wasn't working when asserting anyString() reason being the String within the tested class was an injected value from a properties file. The following line set the injected value in the unit test:

ReflectionTestUtils.setField(bean, "theVariable", "theValue");
user_130145090

I haved the same problem when i make test for controler. Use @MockBean instead @Mock

user_194360730
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