pytest的参数化测试

感觉在单元测试当中可能有用，

但在django这种框架中，用途另一说。

import pytest
import tasks
from tasks import Task

def test_add_1():
    task = Task('breathe', 'Brian', True)
    task_id = tasks.add(task)
    t_from_db = tasks.get(task_id)
    assert equivalent(t_from_db, task)

@pytest.mark.parametrize('task',
                         [Task('sleep', done=True),
                          Task('wake', 'brian'),
                          Task('breath', 'BRIAN', True),
                          Task('exercise', 'BrIaN', False)])
def test_add_2(task):
    task_id = tasks.add(task)
    t_from_db = tasks.get(task_id)
    assert equivalent(t_from_db, task)

@pytest.mark.parametrize('summary, owner, done',
                         [('sleep', None, False),
                          ('wake', 'brian', False),
                          ('breath', 'BRIAN', True),
                          ('eat eggs', 'BrIaN', False),
                          ])
def test_add_3(summary, owner, done):
    task = Task(summary, owner, done)
    task_id = tasks.add(task)
    t_from_db = tasks.get(task_id)
    assert equivalent(t_from_db, task)

tasks_to_try = (Task('sleep', done=True),
                Task('wake', 'brian'),
                Task('breath', 'BRIAN', True),
                Task('exercise', 'BrIaN', False))

@pytest.mark.parametrize('task', tasks_to_try)
def test_add_4(task):
    task_id = tasks.add(task)
    t_from_db = tasks.get(task_id)
    assert equivalent(t_from_db, task)

task_ids = ['Task({},{},{})'.format(t.summary, t.owner, t.done)
            for t in tasks_to_try]

@pytest.mark.parametrize('task', tasks_to_try, ids=task_ids)
def test_add_5(task):
    task_id = tasks.add(task)
    t_from_db = tasks.get(task_id)
    assert equivalent(t_from_db, task)

@pytest.mark.parametrize('task', [
    pytest.param(Task('create'), id='just summary'),
    pytest.param(Task('inspire', 'Michelle'), id='summary/owner'),
    pytest.param(Task('encourage', 'Michelle', True), id='summary/owner/done'),])
def test_add_6(task):
    task_id = tasks.add(task)
    t_from_db = tasks.get(task_id)
    assert equivalent(t_from_db, task)

@pytest.mark.parametrize('task', tasks_to_try, ids=task_ids)
class TestAdd:
    def test_equivalent(self, task):
        task_id = tasks.add(task)
        t_from_db = tasks.get(task_id)
        assert equivalent(t_from_db, task)

    def test_valid_id(self, task):
        task_id = tasks.add(task)
        t_from_db = tasks.get(task_id)
        assert t_from_db.id == task_id

def equivalent(t1, t2):
    return (t1.summary == t2.summary) and (t1.owner == t2.owner) and (t1.done == t2.done)

@pytest.fixture(autouse=True)
def initialized_tasks_db(tmpdir):
    tasks.start_tasks_db(str(tmpdir), 'tiny')
    yield
    tasks.stop_tasks_db()