Question

This is a really newbie question but I don’t know how to stub this.

I have to mock a method to return Class like this.

public Class<? extends SomeClass> getAClass();

if I do something like this

when(this.someInstance.getAClass())
    .thenReturn(SomeClassThatExtendsSomeClass.class);

I get compilation error.

The method thenReturn(Class<capture#1-of ? extends SomeClass>) in the type OngoingStubbing<Class<capture#1-of ? extends SomeClass>> is not applicable for the arguments (Class<SomeClassThatExtendsSomeClass>)

Answer 1

If the method declaration can be changed to what @Bohemian suggested above,

public <T extends SomeClass> Class<T> getAClass();

then you can write your mock statement as follows:

when(this.someInstance.<SomeClassThatExtendsSomeClass>getAClass())
     .thenReturn(SomeClassThatExtendsSomeClass.class);

Otherwise, the doReturn semantics should be used as follows:

Mockito
    .doReturn(SomeClassThatExtendsSomeClass.class)
    .when(this.someInstance.<SomeClassThatExtendsSomeClass>getAClass());