按书上学写测试pytest

慢慢的，这块知识也补好吧。

系统的学习框架，具体的细节，可以边百度边实现。

test_three.py

'''Test the Task data type.'''

from collections import namedtuple

Task = namedtuple('Task', ['summary', 'owner', 'done', 'id'])
Task.__new__.__defaults__=(None, None, False, None)

def test_defaults():
    t1 = Task()
    t2 = Task(None, None, False, None)
    assert t1 == t2

def test_member_access():
    t = Task('buy milk', 'brian')
    assert t.summary == 'buy milk'
    assert t.owner == 'brian'
    assert (t.done, t.id) == (False, None)

'''Test the Task data type'''

from collections import namedtuple

Task = namedtuple('Task', ['summary', 'owner', 'done', 'id'])
Task.__new__.__defaults__=(None, None, False, None)

def test_asdict():
    t_task = Task('do something', 'okken', True, 21)
    t_dict = t_task._asdict()
    expected = {'summary': 'do something',
        'owner': 'okken',
        'done': True,
        'id': 21}
    assert t_dict == expected

def test_replace():
    t_before = Task('finish book', 'brian', False)
    t_after = t_before._replace(id = 10, done = True)
    t_expected = Task('finish book', 'brian', True, 10)
    assert t_after == t_expected