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自動化測試用例的調(diào)試信息非常有用，可以讓我們知道現(xiàn)在的運行情況到，執(zhí)行到哪步以及相應(yīng)的出錯信息等，可以在pytest里面，有時并不會輸出所有信息，比如默認(rèn)情況下pass的測試用例是沒有print輸出的。本文將介紹如何在pytest里面實時顯示所有的log信息。

1. 用print輸出log信息

slowTest_print.py

import time
 
def test_1():
    print 'test_1'
    time.sleep(1)
    print 'after 1 sec'
    time.sleep(1)
    print 'after 2 sec'
    time.sleep(1)
    print 'after 3 sec'
    assert 1, 'should pass'
 
def test_2():
    print 'in test_2'
    time.sleep(1)
    print 'after 1 sec'
    time.sleep(1)
    print 'after 2 sec'
    time.sleep(1)
    print 'after 3 sec'
    assert 0, 'failing for demo purposes'

運行上述程序，pytest會capture所有的輸出，保存直到所有的測試用例都執(zhí)行結(jié)束，并且只輸出那些失敗的測試用例的信息，對于成功的測試用例，沒有print的信息顯示。
從下面的運行結(jié)果，如果需要查看test_1()的運行情況，沒有l(wèi)og信息可看，print沒有顯示。

C:\Users\yatyang\PycharmProjects\pytest_example>pytest -v slowTest_print.py
============================= test session starts =============================
platform win32 -- Python 2.7.13, pytest-3.0.6, py-1.4.32, pluggy-0.4.0 -- C:\Python27\python.exe
cachedir: .cache
metadata: {'Python': '2.7.13', 'Platform': 'Windows-7-6.1.7601-SP1', 'Packages': {'py': '1.4.32', 'pytest': '3.0.6', 'pluggy': '0.4.0'}, 'JAVA_HOME': 'C:\\Program Files (x86)\\Java\\jd
k1.7.0_01', 'Plugins': {'html': '1.14.2', 'metadata': '1.3.0'}}
rootdir: C:\Users\yatyang\PycharmProjects\pytest_example, inifile:
plugins: metadata-1.3.0, html-1.14.2
collected 2 items 

slowTest_print.py::test_1 PASSED
slowTest_print.py::test_2 FAILED

================================== FAILURES ===================================
___________________________________ test_2 ____________________________________

    def test_2():
        print 'in test_2'
        time.sleep(1)
        print 'after 1 sec'
        time.sleep(1)
        print 'after 2 sec'
        time.sleep(1)
        print 'after 3 sec'
>       assert 0, 'failing for demo purposes'
E       AssertionError: failing for demo purposes
E       assert 0

slowTest_print.py:22: AssertionError
---------------------------- Captured stdout call -----------------------------
in test_2
after 1 sec
after 2 sec
after 3 sec
===================== 1 failed, 1 passed in 6.45 seconds ======================

C:\Users\yatyang\PycharmProjects\pytest_example>

我們可以用‘-s’參數(shù)或者 ‘–capture=no’，這樣就可以輸出所有測試用的print信息。但是pytest還是會等著所有的測試用例都執(zhí)行完畢才會顯示運行結(jié)果。可以看到下面的test_1也顯示出print的相關(guān)信息。

C:\Users\yatyang\PycharmProjects\pytest_example>py.test --capture=no slowTest_print.py
============================= test session starts =============================
platform win32 -- Python 2.7.13, pytest-3.0.6, py-1.4.32, pluggy-0.4.0
metadata: {'Python': '2.7.13', 'Platform': 'Windows-7-6.1.7601-SP1', 'Packages': {'py': '1.4.32', 'pytest': '3.0.6', 'pluggy': '0.4.0'}, 'JAVA_HOME': 'C:\\Program Files (x86)\\Java\\jd
k1.7.0_01', 'Plugins': {'html': '1.14.2', 'metadata': '1.3.0'}}
rootdir: C:\Users\yatyang\PycharmProjects\pytest_example, inifile:
plugins: metadata-1.3.0, html-1.14.2
collected 2 items 

slowTest_print.py test_1
after 1 sec
after 2 sec
after 3 sec
.in test_2
after 1 sec
after 2 sec
after 3 sec
F

================================== FAILURES ===================================
___________________________________ test_2 ____________________________________

    def test_2():
        print 'in test_2'
        time.sleep(1)
        print 'after 1 sec'
        time.sleep(1)
        print 'after 2 sec'
        time.sleep(1)
        print 'after 3 sec'
>       assert 0, 'failing for demo purposes'
E       AssertionError: failing for demo purposes
E       assert 0

slowTest_print.py:22: AssertionError
===================== 1 failed, 1 passed in 6.17 seconds ======================

2. Python Logging用法

一般情況下，一些程序的調(diào)試過程中我們會讓它輸出一些信息，特別是一些大型的程序，我們通過這些信息可以了解程序的運行情況，python提供了一個日志模塊logging，它可以把我們想要的信息全部保存到一個日志文件中，方便查看。

import logging

logging.debug('This is debug message')
logging.info('This is info message')
logging.warning('This is warning message')

屏幕上打印:
WARNING:root:This is warning message
默認(rèn)情況下，logging將日志打印到屏幕，日志級別為WARNING；
日志級別大小關(guān)系為：CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET，當(dāng)然也可以自己定義日志級別。

3. 在pytest中用logging代替print

我們現(xiàn)在來看看在pytest的測試用例里面用logging的輸出代替print，有什么不同。
slowTest_logging.py

import time
import logging

logging.basicConfig(level=logging.DEBUG)

def test_1():
    log = logging.getLogger('test_1')
    time.sleep(1)
    log.debug('after 1 sec')
    time.sleep(1)
    log.debug('after 2 sec')
    time.sleep(1)
    log.debug('after 3 sec')
    assert 1, 'should pass'


def test_2():
    log = logging.getLogger('test_2')
    time.sleep(1)
    log.debug('after 1 sec')
    time.sleep(1)
    log.debug('after 2 sec')
    time.sleep(1)
    log.debug('after 3 sec')
    assert 0, 'failing for demo purposes'

運行結(jié)果如下,log信息的顯示是不是可讀性更好了呢。可是pytest還是要等所有的結(jié)果都運行完畢才完全輸出到屏幕上，沒法看到實時的運行情況。比如現(xiàn)在要測試一個新的image，不知道quality如何，如果測試用例非常多，測試人員就得一直等，也許前面的一些測試用都失敗就可以停止執(zhí)行了。那怎么實現(xiàn)實時顯示呢？請看方法4。

C:\Users\yatyang\PycharmProjects\pytest_example>pytest slowTest_logging.py
============================= test session starts =============================
platform win32 -- Python 2.7.13, pytest-3.0.6, py-1.4.32, pluggy-0.4.0
metadata: {'Python': '2.7.13', 'Platform': 'Windows-7-6.1.7601-SP1', 'Packages': {'py': '1.4.32', 'pytest': '3.0.6', 'pluggy': '0.4.0'}, 'JAVA_HOME': 'C:\\Program Files (x86)\\Java\\jd
k1.7.0_01', 'Plugins': {'html': '1.14.2', 'metadata': '1.3.0'}}
rootdir: C:\Users\yatyang\PycharmProjects\pytest_example, inifile:
plugins: metadata-1.3.0, html-1.14.2
collected 2 items 

slowTest_logging.py .F

================================== FAILURES ===================================
___________________________________ test_2 ____________________________________

    def test_2():
        log = logging.getLogger('test_2')
        time.sleep(1)
        log.debug('after 1 sec')
        time.sleep(1)
        log.debug('after 2 sec')
        time.sleep(1)
        log.debug('after 3 sec')
>       assert 0, 'failing for demo purposes'
E       AssertionError: failing for demo purposes
E       assert 0

slowTest_logging.py:25: AssertionError
---------------------------- Captured stderr call -----------------------------
DEBUG:test_2:after 1 sec
DEBUG:test_2:after 2 sec
DEBUG:test_2:after 3 sec
===================== 1 failed, 1 passed in 6.37 seconds ======================

C:\Users\yatyang\PycharmProjects\pytest_example>pytest -s slowTest_logging.py
============================= test session starts =============================
platform win32 -- Python 2.7.13, pytest-3.0.6, py-1.4.32, pluggy-0.4.0
metadata: {'Python': '2.7.13', 'Platform': 'Windows-7-6.1.7601-SP1', 'Packages': {'py': '1.4.32', 'pytest': '3.0.6', 'pluggy': '0.4.0'}, 'JAVA_HOME': 'C:\\Program Files (x86)\\Java\\jd
k1.7.0_01', 'Plugins': {'html': '1.14.2', 'metadata': '1.3.0'}}
rootdir: C:\Users\yatyang\PycharmProjects\pytest_example, inifile:
plugins: metadata-1.3.0, html-1.14.2
collected 2 items 

slowTest_logging.py DEBUG:test_1:after 1 sec
DEBUG:test_1:after 2 sec
DEBUG:test_1:after 3 sec
.DEBUG:test_2:after 1 sec
DEBUG:test_2:after 2 sec
DEBUG:test_2:after 3 sec
F

================================== FAILURES ===================================
___________________________________ test_2 ____________________________________

    def test_2():
        log = logging.getLogger('test_2')
        time.sleep(1)
        log.debug('after 1 sec')
        time.sleep(1)
        log.debug('after 2 sec')
        time.sleep(1)
        log.debug('after 3 sec')
>       assert 0, 'failing for demo purposes'
E       AssertionError: failing for demo purposes
E       assert 0

slowTest_logging.py:25: AssertionError
===================== 1 failed, 1 passed in 6.18 seconds ======================

4. pytest用logging和--capture=no實現(xiàn)實時輸出log信息

請自己去運行下面的程序吧，可以看到該程序是實時輸出當(dāng)前測試用例執(zhí)行的情況。

C:\Users\yatyang\PycharmProjects\pytest_example>pytest -s slowTest_logging.py
============================= test session starts =============================
platform win32 -- Python 2.7.13, pytest-3.0.6, py-1.4.32, pluggy-0.4.0
metadata: {'Python': '2.7.13', 'Platform': 'Windows-7-6.1.7601-SP1', 'Packages': {'py': '1.4.32', 'pytest': '3.0.6', 'pluggy': '0.4.0'}, 'JAVA_HOME': 'C:\\Program Files (x86)\\Java\\jd
k1.7.0_01', 'Plugins': {'html': '1.14.2', 'metadata': '1.3.0'}}
rootdir: C:\Users\yatyang\PycharmProjects\pytest_example, inifile:
plugins: metadata-1.3.0, html-1.14.2
collected 2 items 

slowTest_logging.py DEBUG:test_1:after 1 sec
DEBUG:test_1:after 2 sec
DEBUG:test_1:after 3 sec
.DEBUG:test_2:after 1 sec
DEBUG:test_2:after 2 sec
DEBUG:test_2:after 3 sec
F

================================== FAILURES ===================================
___________________________________ test_2 ____________________________________

    def test_2():
        log = logging.getLogger('test_2')
        time.sleep(1)
        log.debug('after 1 sec')
        time.sleep(1)
        log.debug('after 2 sec')
        time.sleep(1)
        log.debug('after 3 sec')
>       assert 0, 'failing for demo purposes'
E       AssertionError: failing for demo purposes
E       assert 0

slowTest_logging.py:25: AssertionError
===================== 1 failed, 1 passed in 6.20 seconds ======================

5.總結(jié)

在寫自動化測試用例時，添加有用的log信息是非常有必要的。比如在初期的調(diào)試過程，能夠一旦運行有問題，就可以獲取到精確的調(diào)試信息。后期在穩(wěn)定的運行中，其他測試人員來運行也可以很容易上手，所以大家一定要重視測試用例的調(diào)試信息。
通過本文，應(yīng)該知道如何用pytest，logging和--capture=no實現(xiàn)運行測試用例的實時輸出所有的log信息。

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Pytest如何輸出Log信息

Pytest如何輸出Log信息

1. 用print輸出log信息

2. Python Logging用法

3. 在pytest中用logging代替print

4. pytest用logging和--capture=no實現(xiàn)實時輸出log信息

5.總結(jié)

推薦閱讀更多精彩內(nèi)容

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美 国产 综合 欧美 视频

Pytest如何輸出Log信息

1. 用print輸出log信息

2. Python Logging用法

3. 在pytest中用logging代替print

4. pytest用logging和--capture=no實現(xiàn)實時輸出log信息

5.總結(jié)

推薦閱讀更多精彩內(nèi)容

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频