pytest 5. fixture之yield实现teardown

前言：

　　1.前面讲的是在用例前加前置条件，相当于setup,既然有setup那就有teardown,fixture里面的teardown用yield来唤醒teardown的执行

看以下的代码：

#!/usr/bin/env/python
# -*-coding:utf-8-*-
# authour:xiapmin_pei

import pytest

@pytest.fixture(scope="module")
def open():
    print("打开浏览器，并且打开百度首页")

    yield
    print("执行teardown!")
    print("最后关闭浏览器")

def test_s1(open):
    print("用例1：搜索python-1")

def test_s2(open):
    print("用例2：搜索python-2")

def test_s3(open):
    print("用例3：搜索python-3")

执行结果：yield之后的代码在最后才运行。

 yield遇到异常：

　　1.如果其中一个用例出现异常，不影响yield后面的teardown执行,运行结果互不影响，并且在用例全部执行完之后，会呼唤teardown的内容

#!/usr/bin/env/python
# -*-coding:utf-8-*-
# authour:xiapmin_pei

import pytest

@pytest.fixture(scope="module")
def open():
    print("打开浏览器，并且打开百度首页")

    yield
    print("执行teardown!")
    print("最后关闭浏览器")

def test_s1(open):
    print("用例1：搜索python-1")
    #如果第一个用例异常了，不影响其他的用例执行
    raise NameError  # 模拟异常

def test_s2(open):
    print("用例2：搜索python-2")

def test_s3(open):
    print("用例3：搜索python-3")

运行结果：

============================= test session starts ==============================
platform darwin -- Python 2.7.10, pytest-3.6.3, py-1.5.2, pluggy-0.6.0
rootdir: /Users/newcomer/PycharmProjects/error/wuya/pytestDemo, inifile:
plugins: D3-2.0.13, cov-2.5.1, catchlog-1.2.2, allure-adaptor-1.7.10, georaven-17.1.0.170collected 3 items

test_mod.py 打开浏览器，并且打开百度首页
F用例1：搜索python-1

test_mod.py:14 (test_s1)
open = None

def test_s1(open):
print("用例1：搜索python-1")
#如果第一个用例异常了，不影响其他的用例执行
> raise NameError # 模拟异常
E NameError

test_mod.py:18: NameError
.用例2：搜索python-2
.用例3：搜索python-3
执行teardown!
最后关闭浏览器
[100%]

=================================== FAILURES ===================================
___________________________________ test_s1 ____________________________________

open = None

def test_s1(open):
print("用例1：搜索python-1")
#如果第一个用例异常了，不影响其他的用例执行
> raise NameError # 模拟异常
E NameError

test_mod.py:18: NameError
---------------------------- Captured stdout setup -----------------------------
打开浏览器，并且打开百度首页
----------------------------- Captured stdout call -----------------------------
用例1：搜索python-1
=============================== warnings summary ===============================
<undetermined location>
pytest-catchlog plugin has been merged into the core, please remove it from your requirements.

-- Docs: http://doc.pytest.org/en/latest/warnings.html
================ 1 failed, 2 passed, 1 warnings in 0.07 seconds ================
Process finished with exit code 0

2.如果在setup就异常了，那么是不会去执行yield后面的teardown内容了

#!/usr/bin/env/python
# -*-coding:utf-8-*-
# authour:xiapmin_pei

import pytest

@pytest.fixture(scope="module")
def open():
    print("打开浏览器，并且打开百度首页")
    raise NameError  # 模拟异常

    yield
    print("执行teardown!")
    print("最后关闭浏览器")

def test_s1(open):
    print("用例1：搜索python-1")
    #如果第一个用例异常了，不影响其他的用例执行
    raise NameError  # 模拟异常

def test_s2(open):
    print("用例2：搜索python-2")

def test_s3(open):
    print("用例3：搜索python-3")

运行结果：

============================= test session starts ==============================
platform darwin -- Python 2.7.10, pytest-3.6.3, py-1.5.2, pluggy-0.6.0
rootdir: /Users/newcomer/PycharmProjects/error/wuya/pytestDemo, inifile:
plugins: D3-2.0.13, cov-2.5.1, catchlog-1.2.2, allure-adaptor-1.7.10, georaven-17.1.0.170collected 3 items

test_mod.py E打开浏览器，并且打开百度首页

test setup failed
@pytest.fixture(scope="module")
def open():
print("打开浏览器，并且打开百度首页")
> raise NameError # 模拟异常
E NameError

test_mod.py:10: NameError
E
test setup failed
@pytest.fixture(scope="module")
def open():
print("打开浏览器，并且打开百度首页")
> raise NameError # 模拟异常
E NameError

test_mod.py:10: NameError
E
test setup failed
@pytest.fixture(scope="module")
def open():
print("打开浏览器，并且打开百度首页")
> raise NameError # 模拟异常
E NameError

test_mod.py:10: NameError
[100%]

==================================== ERRORS ====================================
__________________________ ERROR at setup of test_s1 ___________________________

@pytest.fixture(scope="module")
def open():
print("打开浏览器，并且打开百度首页")
> raise NameError # 模拟异常
E NameError

test_mod.py:10: NameError
---------------------------- Captured stdout setup -----------------------------
打开浏览器，并且打开百度首页
__________________________ ERROR at setup of test_s2 ___________________________

@pytest.fixture(scope="module")
def open():
print("打开浏览器，并且打开百度首页")
> raise NameError # 模拟异常
E NameError

test_mod.py:10: NameError
__________________________ ERROR at setup of test_s3 ___________________________

@pytest.fixture(scope="module")
def open():
print("打开浏览器，并且打开百度首页")
> raise NameError # 模拟异常
E NameError

test_mod.py:10: NameError
=============================== warnings summary ===============================
<undetermined location>
pytest-catchlog plugin has been merged into the core, please remove it from your requirements.

-- Docs: http://doc.pytest.org/en/latest/warnings.html
===================== 1 warnings, 3 error in 0.08 seconds ======================
Process finished with exit code 0