pytest--参数化parametrize

前言

pytest.mark.parametrize装饰器可以实现测试用例参数化。

parametrizing

1.这里是一个实现检查一定的输入和期望输出测试功能的典型例子

# coding:utf-8
import pytest
@pytest.mark.parametrize("test_input,expect",
                    [("3+5",8),("2+4",6),("6*9",42),])
def test_params(test_input,expect):
    assert eval(test_input)==expect
if __name__=="__main__":
    pytest.main(["-s","test_fix1.py"])

运行结果

============================= test session starts =============================
platform win32 -- Python 3.8.2, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: D:\study\xyautotest
plugins: allure-pytest-2.8.19, Faker-4.18.0, hypothesis-6.14.6, assume-2.4.3, forked-1.3.0, html-2.1.1, metadata-1.10.0, ordering-0.6, rerunfailures-9.1.1, xdist-2.3.0, tep-0.8.9collected 3 items

test_f1.py ..F
test_f1.py:2 (test_params[6*9-42])
54 != 42

Expected :42
Actual   :54
<Click to see difference>

test_input = '6*9', expect = 42

    @pytest.mark.parametrize("test_input,expect",
                        [("3+5",8),("2+4",6),("6*9",42),])
    def test_params(test_input,expect):
>       assert eval(test_input)==expect
E       AssertionError: assert 54 == 42
E        +  where 54 = eval('6*9')

test_f1.py:6: AssertionError

Assertion failed
                                                           [100%]

================================== FAILURES ===================================
_____________________________ test_params[6*9-42] _____________________________

test_input = '6*9', expect = 42

    @pytest.mark.parametrize("test_input,expect",
                        [("3+5",8),("2+4",6),("6*9",42),])
    def test_params(test_input,expect):
>       assert eval(test_input)==expect
E       AssertionError: assert 54 == 42
E        +  where 54 = eval('6*9')

test_f1.py:6: AssertionError
=========================== short test summary info ===========================
FAILED test_f1.py::test_params[6*9-42] - AssertionError: assert 54 == 42
========================= 1 failed, 2 passed in 0.26s =========================

Process finished with exit code 0

Assertion failed

Assertion failed

在这个例子中设计的，只有一条输入/输出值的简单测试功能。和往常一样函数的参数，你可以在运行结果看到在输入和输出值。

2.它也可以标记单个测试实例在参数化，例如使用内置的mark.xfail

# coding:utf-8
import pytest
@pytest.mark.parametrize("test_input,expect",
                    [("3+5",8),
                     pytest.param("2+4",6,marks=pytest.mark.xfail),
                     pytest.param("6*9",42,marks=pytest.mark.xfail),])
def test_params(test_input,expect):
    print("-------开始执行测试用例-------")
    print(f"test_input:{test_input}")
    print(f"expect:{expect}")
    assert eval(test_input)==expect
if __name__=="__main__":
    pytest.main(["-s","test_fix1.py"])

运行结果　

============================= test session starts =============================
platform win32 -- Python 3.8.2, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: D:\study\xyautotest
plugins: allure-pytest-2.8.19, Faker-4.18.0, hypothesis-6.14.6, assume-2.4.3, forked-1.3.0, html-2.1.1, metadata-1.10.0, ordering-0.6, rerunfailures-9.1.1, xdist-2.3.0, tep-0.8.9collected 3 items

test_f1.py                                                            [100%]

=================== 1 passed, 1 xfailed, 1 xpassed in 0.25s ===================

Process finished with exit code 0
.-------开始执行测试用例-------
test_input:3+5
expect:8
X-------开始执行测试用例-------
test_input:2+4
expect:6
x-------开始执行测试用例-------
test_input:6*9
expect:42

test_input = '6*9', expect = 42

    @pytest.mark.parametrize("test_input,expect",
                        [("3+5",8),
                         pytest.param("2+4",6,marks=pytest.mark.xfail),
                         pytest.param("6*9",42,marks=pytest.mark.xfail),])
    def test_params(test_input,expect):
        print("-------开始执行测试用例-------")
        print(f"test_input:{test_input}")
        print(f"expect:{expect}")
>       assert eval(test_input)==expect
E       AssertionError: assert 54 == 42
E        +  where 54 = eval('6*9')

test_f1.py:11: AssertionError

标记为失败的用例，预期结果是失败，实际运行也是失败，显示xfailed

参数组合

1.若要获得多个参数化参数的所有组合，可以堆叠参数化装饰器

# coding:utf-8
import pytest
@pytest.mark.parametrize("x",[0,1])
@pytest.mark.parametrize("y",[2,3])
def test_a(x,y):
    #print("测试数据组合:x—>%s,y—>%s"%(x,y))
    print("测试参数组合，x:{},y:{}".format(x,y))
if __name__=="__main__":
    pytest.main(["-s","test_fix1.py"])

运行结果：

============================= test session starts =============================
platform win32 -- Python 3.8.2, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: D:\study\xyautotest
plugins: allure-pytest-2.8.19, Faker-4.18.0, hypothesis-6.14.6, assume-2.4.3, forked-1.3.0, html-2.1.1, metadata-1.10.0, ordering-0.6, rerunfailures-9.1.1, xdist-2.3.0, tep-0.8.9collected 4 items

test_f1.py                                                           [100%]

============================== 4 passed in 0.13s ==============================

Process finished with exit code 0
.测试参数组合，x:0,y:2
.测试参数组合，x:1,y:2
.测试参数组合，x:0,y:3
.测试参数组合，x:1,y:3

如下是多参数？

# coding:utf-8
import pytest
@pytest.mark.parametrize("x,y",([0,1],
                                [1,2],
                                [2,3]))
def test_a(x,y):
    #print("测试数据组合:x—>%s,y—>%s"%(x,y))
    print("测试参数组合，x:{},y:{}".format(x,y))
if __name__=="__main__":
    pytest.main(["-s","test_fix1.py"])

运行结果：

============================= test session starts =============================
platform win32 -- Python 3.8.2, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: D:\study\xyautotest
plugins: allure-pytest-2.8.19, Faker-4.18.0, hypothesis-6.14.6, assume-2.4.3, forked-1.3.0, html-2.1.1, metadata-1.10.0, ordering-0.6, rerunfailures-9.1.1, xdist-2.3.0, tep-0.8.9collected 3 items

test_f1.py                                                            [100%]

============================== 3 passed in 0.12s ==============================

Process finished with exit code 0
.测试参数组合，x:0,y:1
.测试参数组合，x:1,y:2
.测试参数组合，x:2,y:3