pytest文档9-参数化parametrize

转载地址：https://www.cnblogs.com/yoyoketang/p/9455276.html

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

# content of test_expectation.py

# coding:utf-8

import pytest
@pytest.mark.parametrize("test_input,expected",
                         [ ("3+5", 8),
                           ("2+4", 6),
                           ("6 * 9", 42),
                         ])
def test_eval(test_input, expected):
    assert eval(test_input) == expected

if __name__ == "__main__":
    pytest.main(["-s", "test_canshu1.py"])

运行结果

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

test_input = '6 * 9', expected = 42

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

test_canshu1.py:11: AssertionError
===================== 1 failed, 2 passed in 1.98 seconds ======================

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

# content of test_expectation.py
import pytest
@pytest.mark.parametrize("test_input,expected", [
                        ("3+5", 8),
                        ("2+4", 6),
                        pytest.param("6 * 9", 42, marks=pytest.mark.xfail),
                        ])
def test_eval(test_input, expected):
    print("-------开始用例------")
    assert eval(test_input) == expected



if __name__ == "__main__":
    pytest.main(["-s", "test_canshu1.py"])

运行结果：

test_canshu1.py -------开始用例------
.-------开始用例------
.-------开始用例------
x

===================== 2 passed, 1 xfailed in 1.84 seconds =====================

标记为失败的用例就不运行了，直接跳过显示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

import pytest
@pytest.mark.parametrize("x", [0, 1])
@pytest.mark.parametrize("y", [2, 3])
def test_foo(x, y):
    print("测试数据组合：x->%s, y->%s" % (x, y))


if __name__ == "__main__":
    pytest.main(["-s", "test_canshu1.py"])

运行结果

test_canshu1.py 测试数据组合：x->0, y->2
.测试数据组合：x->1, y->2
.测试数据组合：x->0, y->3
.测试数据组合：x->1, y->3
.

========================== 4 passed in 1.75 seconds ===========================