@given(task_level_lists)
    def test_child_greater_than_parent(self, task_level):
        task = TaskLevel(level=task_level)
        self.assert_fully_less_than(task, task.child())
L{TaskLevel.child} returns a child that is greater than its parent.
dataset/ETHPy150Open ClusterHQ/eliot/eliot/tests/test_action.py/TaskLevelTests.test_child_greater_than_parent