def test_get_question_answer_attrs():
DB.save_answer(tid=test_tid, aid='a1', url='http://a/1', qid='q1',
time=datetime.now(), answerer='aer')
assert AnswerManager.get_question_answer_attrs(test_tid, 'q1', 'url')\
== ['http://a/1']
assert AnswerManager.get_question_answer_attrs(test_tid, 'q1', 'aid', 'answerer') \
== [['a1', 'aer']]
DB.save_answer(tid=test_tid, aid='a2', url='http://a/2', qid='q1',
time=datetime.now(), answerer='aer2')
assert AnswerManager.get_question_answer_attrs(test_tid, 'q1', 'url') \
== ['http://a/1', 'http://a/2']
assert AnswerManager.get_question_answer_attrs(test_tid, 'q1', 'aid', 'answerer') \
== [['a1', 'aer'], ['a2', 'aer2']]
