pytest文档9-参数化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
# 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,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
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 ===========================
这将运行测试,参数设置为x=0/y=2,x=1/y=2,x=0/y=3,x=1/y=3组合参数。