Mocking a class inside the tested method

I have a problem with a class I have to mock.

The tested method looks like this:

testedMethod(Date from, Date to, Set set1, Set set2, SomeContext context) { method body };

Now inside the method body, there is a class used. The usage looks like this:

List list = ComponentsFetcher.getComponent(String string1, context, from, to, String string2);

The whole tested method (a bit simplified) looks like this:

public static final long testedMethod(Date from, Date to, Set set1, Set set2, SomeContext context) {

    long returnedLong = 0;

    List list1 = ComponentsFetcher.getComponent(String string1, context, from, to, String string2);
    List list2 = ComponentsFetcher.getComponent(String string3, context, from, to, String string4);

    returnedLong = TestedMethodsClass.anotherMethod(from, to, set1, set2, list1, list2

    return returnedLong;

};

This ComponentsFetcher.getComponent() method is doing many things, but ALL I need here is to get this list, I know how is this list looking like, I can simply create it and use it later in the tested method.

So I am wanting to mock the ComponentsFetcher.getComponent() like this:

private void mockComponentsFetcher(Date from, Date to, ComponentsContext context, List list1, List list2) throws SomeBusinessException {
    Mockito.mock(ComponentsFetcher.class);
    Mockito.when(ComponentsFetcher.getComponent(string1, context, from, to, string2)).thenReturn(list1);
    Mockito.when(ComponentsFetcher.getComponent(string3, context, from, to, string4)).thenReturn(list2);
    }

Finally, the @Test method:

@Test
    public void testTestedMethod() throws ParseException, SomeBusinessException {
        //given
        Date from = DateHelper.getDate(2011, 07, 03);
        Date to = DateHelper.getDate(2012, 07, 03);
        Set set1 = null; // can be null
        Set set2 = DateHelper.getDate(2011, 07, 03);
                Date day = DateHelper.getDate(2011, 07, 03);

        List list1 = getList(new Date[]{
                                // contents of the list
               });
        List list2 = getList(new Date[]{
                                // contents of the list
               });

        //mock
        ComponentsContext context = mockContext(day);

// This context REALLY DOESNT matter, it is mocked just for the method to run.

// here is the main problem, I have no idea how to use this mocked ComponentsFetcher, while it is used INSIDE the testedMethod

        mockComponentsFetcher(from, to, context, list1, list2);
        //when
        long months = TestedMethodsClass.testedMethod(from, to, set1, set2, context);
        //then
        long awaited = 12;
        assertThat(months).isEqualTo(awaited);
    }

But it ain't working at all...