def test_is_fee_returns_false_when_current_task_is_not_none():
processor = Processor()
processor.add_time_unit()
processor.set_task(Task('T1', 2, 2))
assert not processor.is_free()
def test_is_fee_returns_true_when_current_task_is_none():
processor = Processor()
processor.add_time_unit()
assert processor.is_free()