When a TestNG test is generated with Mockito mocks, an incorrect method MockitoAnnotations.init(this) is used for initializing the mocks in @BeforeMethod method. It should use MockitoAnnotations.initMocks(this); MoreUnit ver. 3.0.0.02
Woops, looks like we missed this report :-\ Thanks for it Andrei !
It will be fixed in version 3.0.2