Final method mocking

Question

I need mock some class with final method using mockito. I have wrote something like this

@Test public void test() {     B b = mock(B.class);     doReturn("bar called").when(b).bar();        assertEquals("must be \"overrided\"", "bar called", b.bar());     //bla-bla }   class B {     public final String bar() {         return "fail";     } } 

But it fails. I tried some "hack" and it works.

   @Test    public void hackTest() {         class NewB extends B {             public String barForTest() {                 return bar();             }         }         NewB b = mock(NewB.class);         doReturn("bar called").when(b).barForTest();         assertEquals("must be \"overrided\"", "bar called", b.barForTest());     } 

It works, but "smells".

So, Where is the right way?

Thanks.

Answer 1

From the Mockito FAQ:

What are the limitations of Mockito

• Cannot mock final methods - their real behavior is executed without any exception. Mockito cannot warn you about mocking final methods so be vigilant.

Answer 2

There is no support for mocking final methods in Mockito.

As Jon Skeet commented you should be looking for a way to avoid the dependency on the final method. That said, there are some ways out through bytecode manipulation (e.g. with PowerMock)

A comparison between Mockito and PowerMock will explain things in detail.