List<User> mockUsers = new ArrayList<User>();
User mockUser = MockProvider.createMockUser();
mockUsers.add(mockUser);
// user query
when(sampleUserQuery.memberOfGroup(anyString())).thenReturn(sampleUserQuery);
when(sampleUserQuery.list()).thenReturn(mockUsers);
// group query
List<Group> mockGroups = MockProvider.createMockGroups();
when(sampleGroupQuery.groupMember(anyString())).thenReturn(sampleGroupQuery);