pytest fixtures装饰器的使用和如何控制用例的执行顺序

#!/usr/bin/env python
# _*_coding: utf-8 _*_
import pytest


@pytest.fixture()
def login():
 print("这时一个登入的方法")
 return ('tome', '123')


@pytest.fixture()
def operate():
 print("这是登入后的操作")


def test_case1(login, operate):
 print(login)
 print("test_case1,需要登入")


def test_case2():
 print("test_case2,不需要登入")


def test_case3(login):
 print(login)
 print("test_case3,需要登入")

Testing started at 10:17 ...
C:\Python\python.exe "C:\Program Files\JetBrains\PyCharm Community Edition 2019.1\helpers\pycharm\_jb_pytest_runner.py" --path C:/Users/wanwen/PycharmProjects/vigo/xuexi/20210123/test_fixture.py
Launching pytest with arguments C:/Users/wanwen/PycharmProjects/vigo/xuexi/20210123/test_fixture.py in C:\Users\wanwen\PycharmProjects\vigo\xuexi\20210123
============================= test session starts =============================
platform win32 -- Python 3.8.0, pytest-5.4.3, py-1.9.0, pluggy-0.13.1
rootdir: C:\Users\wanwen\PycharmProjects\vigo\xuexi\20210123
plugins: html-2.1.1, metadata-1.11.0, ordering-0.6collected 3 items

test_fixture.py 这时一个登入的方法
这是登入后的操作
.('tome', '123')
test_case1,需要登入
.test_case2,不需要登入
这时一个登入的方法
.('tome', '123')
test_case3,需要登入
              [100%]

============================== 3 passed in 0.04s ==============================

Process finished with exit code 0

pip install pytest-ordering

#!/usr/bin/env python
# _*_coding: utf-8 _*_
import pytest


class Testpytest(object):

  @pytest.mark.run(order=-1)
  def test_two(self):
    print("test_two, 测试用例")

  @pytest.mark.run(order=3)
  def test_one(self):
    print("test_one, 测试用例")

  @pytest.mark.run(order=1)
  def test_three(self):
    print("test_three, 测试用例")

Testing started at 15:51 ...
C:\Python\python.exe "C:\Program Files\JetBrains\PyCharm Community Edition 2019.1\helpers\pycharm\_jb_pytest_runner.py" --path C:/Users/wanwen/PycharmProjects/vigo/xuexi/20210123/test_order.py
Launching pytest with arguments C:/Users/wanwen/PycharmProjects/vigo/xuexi/20210123/test_order.py in C:\Users\wanwen\PycharmProjects\vigo\xuexi\20210123
============================= test session starts =============================
platform win32 -- Python 3.8.0, pytest-5.4.3, py-1.9.0, pluggy-0.13.1
rootdir: C:\Users\wanwen\PycharmProjects\vigo\xuexi\20210123
plugins: html-2.1.1, metadata-1.11.0, ordering-0.6collected 3 items

test_order.py                             [100%]

============================== 3 passed in 0.06s ==============================

Process finished with exit code 0
.test_three, 测试用例
.test_one, 测试用例
.test_two, 测试用例