pytest框架学习_1

pytest框架

安装pytest

pip install -U pytest

查看安装版本

pip show pytest
pytest --version

先看官网的一个例子，这个例子告诉你pytest的执行规则：

新建一个test_sample.py文件，代码如下：

def func(x):
    return x + 1

def test_anwder():
    assert func(3) == 4

pytest执行信息：
E:\PycharmProjects\pytest_study
λ pytest     # 文件名必须以test_开头，否则执行pytest会找不到用例
============================== test session starts =============================== platform win32 -- Python 3.7.3, pytest-4.5.0, py-1.8.0, pluggy-0.11.0
rootdir: E:\PycharmProjects\pytest_study
collected 1 item

first_pytest_demo.py .                                                     [100%]

============================ 1 passed in 0.12 seconds ============================

Note:

’λ‘ 是cmder工具的符号相当于cmd的 ‘>’，不明白可忽略。
pytest运行规则：查找当前目录及其子目录下以test_.py或_test.py文件，找到文件后，在文件中找到以test开头函数并执行

多个用例可以放在一个class里

# content of test_class.py
class TestClass(object):
    def test_one(self):
        x = "this"
        assert 'h' in x

    def test_two(self):
        x = "hello"
        assert hasattr(x, 'check')

pytest执行信息
E:\PycharmProjects\pytest_study
λ pytest
============================== test session starts =============================== platform win32 -- Python 3.7.3, pytest-4.5.0, py-1.8.0, pluggy-0.11.0
rootdir: E:\PycharmProjects\pytest_study
collected 2 items

test_pytest_demo.py .F                                                      [100%]

==================================== FAILURES ==================================== _______________________________ TestClass.test_two _______________________________

self = <test_pytest_demo.TestClass object at 0x00000000036E3CC0>

def test_two(self):
x = "hello"

> assert hasattr(x, 'check')
> E       AssertionError: assert False
> E        +  where False = hasattr('hello', 'check')

test_pytest_demo.py:25: AssertionError
======================= 1 failed, 1 passed in 0.16 seconds =======================

是不是看着很眼熟？没错，和python的unittest很相似。