Time will tell.

做自動化測試時我們一般會一個用例寫多個斷言，而當第一個斷言失敗後，後面的程式碼就不會執行。這時我們可以引進pytest-assume外掛來解決這些問題。

一、安裝

pip install pytest-assume

二、案例

在test_01用例中，第一個斷言assert 0 == 1失敗，後面的程式碼不會執行。

import pytest

class Test(object):
    def test_01(self):
        """用例1"""
        print('執行test_01斷言1')
        assert 0 == 1
        print('執行test_01斷言2')
        assert 1 == 2

    def test_02(self):
        """用例2"""
        print('執行test_02斷言1')
        assert 3 == 3
        print('執行test_02斷言2')
        assert 4 == 4

if __name__ == '__main__':
    pytest.main(['-s', 'test_C_01.py'])

 

C:\Users\admin\AppData\Local\Programs\Python\Python37\python.exe C:/Users/admin/Desktop/程式碼/Test/test/test_C_01.py
============================= test session starts =============================
platform win32 -- Python 3.7.7, pytest-5.4.2, py-1.8.1, pluggy-0.13.1
rootdir: C:\Users\admin\Desktop\程式碼\Test\test
plugins: assume-2.2.1
收集的測試用例:[<Function test_01>, <Function test_02>]
排序後收集的測試用例:[<Function test_01>, <Function test_02>]
collected 2 items

test_C_01.py 執行test_01斷言1
F執行test_02斷言1
執行test_02斷言2
.

================================== FAILURES ===================================
________________________________ Test.test_01 _________________________________

self = <test.test_C_01.Test object at 0x0000018C74AAEF48>

    def test_01(self):
        """用例1"""
        print('執行test_01斷言1')
>       assert 0 == 1
E       assert 0 == 1

test_C_01.py:11: AssertionError
=========================== short test summary info ===========================
FAILED test_C_01.py::Test::test_01 - assert 0 == 1
========================= 1 failed, 1 passed in 0.06s =========================

Process finished with exit code 0

 

三、使用pytest.assume

預期結果 == 實際結果。

在test_01用例中，第一個斷言pytest.assume(0 == 1)失敗後，print('執行test_01斷言2')和pytest.assume(1 == 2)仍執行了。

說明同一用例中使用pytest.assume進行斷言，即便第一個失敗了，後面的程式碼也會繼續執行。.

import pytest

class Test(object):
    def test_01(self):
        """用例1"""
        print('執行test_01斷言1')
        pytest.assume(0 == 1)
        print('執行test_01斷言2')
        pytest.assume(1 == 2)

    def test_02(self):
        """用例2"""
        print('執行test_02斷言1')
        pytest.assume(3 == 3)
        print('執行test_02斷言2')
        pytest.assume(4 == 4)

if __name__ == '__main__':
    pytest.main(['-s', 'test_C_01.py'])

 

C:\Users\admin\AppData\Local\Programs\Python\Python37\python.exe C:/Users/admin/Desktop/程式碼/Test/test/test_C_01.py
============================= test session starts =============================
platform win32 -- Python 3.7.7, pytest-5.4.2, py-1.8.1, pluggy-0.13.1
rootdir: C:\Users\admin\Desktop\程式碼\Test\test
plugins: assume-2.2.1
收集的測試用例:[<Function test_01>, <Function test_02>]
排序後收集的測試用例:[<Function test_01>, <Function test_02>]
collected 2 items

test_C_01.py 執行test_01斷言1
執行test_01斷言2
F執行test_02斷言1
執行test_02斷言2
.

================================== FAILURES ===================================
________________________________ Test.test_01 _________________________________

tp = <class 'pytest_assume.plugin.FailedAssumption'>, value = None, tb = None

    def reraise(tp, value, tb=None):
        try:
            if value is None:
                value = tp()
            if value.__traceback__ is not tb:
               raise value.with_traceback(tb)
               pytest_assume.plugin.FailedAssumption: 
               2 Failed Assumptions:
               
               test_C_01.py:12: AssumptionFailure
               >>  pytest.assume(0 == 1)
               AssertionError: assert False
               
               test_C_01.py:15: AssumptionFailure
               >>  pytest.assume(1 == 2)
               AssertionError: assert False

..\..\..\..\AppData\Roaming\Python\Python37\site-packages\six.py:702: FailedAssumption
=========================== short test summary info ===========================
FAILED test_C_01.py::Test::test_01 - pytest_assume.plugin.FailedAssumption: 
========================= 1 failed, 1 passed in 0.20s =========================

Process finished with exit code 0

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