final model = DefaultGroupTaskReportModel.of(target)

        then:
        model.getTasksForGroup('group') as List == [task1, task2, task3, task4, task5, task6, task7, task8]
    }

    def renamesDefaultGroupWhenOtherGroupNotPresent() {
        TaskDetails task1 = taskDetails('1')
        TaskDetails task2 = taskDetails('2')
        _ * target.groups >> ['a', '']
        _ * target.getTasksForGroup('a') >> [task1]