CODEWITHSUNDEEP
javagenericsgeneric-collectionsunbounded-wildcard
user2688181
user2688181

Reputation: 19

How to add some value in generic wildcard map<?,?>

I have gone through couple of related questions but those are not help me out. Actually, I have a method whose return type is Map<?,?> and I want to do unit test using Mockito. Sample Code is:

Map<?, ?> resultMap = dataServiceMapper.getData(serviceContext, requestData.getId());

and I want to Mock this:

dataServiceMapper.getData(serviceContext, requestData.getId()):

Mocking Code is :

Mockito.when(mapperMock.getData(any(ServiceContext.class), anyString())).thenReturn(value).

In value if I return normal Map with String then its throwing compile time error except null (as per documentation).

But I want to add some data like String so that after getting mocking map data I can do further work.

Upvotes: -1

Views: 507

Answers (1)

Darshan Mehta
Darshan Mehta

Reputation: 30819

To mock a method, all you need to do is pass a Map without generic type. Generics are removed after compilation anyway, and all you are doing is writing a test so, implementation similar to below example should work:

//Actual method
public Map<?, ?> getData(String input){
    return null;
}

//Test
public void test() {
    Test2 t2 = Mockito.mock(Test2.class);
    Map result = new HashMap();
    Mockito.when(t2.getData(Mockito.anyString())).thenReturn(result);
}

Upvotes: 0

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