安装pytest
命令行输入：
pip install -U pytest
检查是否安装了正确的版本：
λ pytest --version This is pytest version 5.3.5,imported from e:\python37\lib\site-packages\pytest\__init__.py setuptools registered plugins: pytest-html-2.0.1 at e:\python37\lib\site-packages\pytest_html\plugin.py pytest-Metadata-1.8.0 at e:\python37\lib\site-packages\pytest_Metadata\plugin.py
一个简单的demo
import pytest def func(x): return x + 1 test_answer(): assert func(3) == 5
运行demo
首先进入到此demo文件的路径下，然后执行 pytest ，会运行名称为test*.py的文件（*匹配任意符合字母和数字）
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。
C:\Users\haiy\Desktop\code\iot_yjb_api λ pytest ============================ test session starts ============================= platform win32 -- Python 3.7.1rc1,pytest-1,pluggy-0.13.1 rootdir: C:\Users\haiy\Desktop\code\iot_yjb_api plugins: html-Metadata-0 collected item test_api.py F [100%] ================================== FAILURES ================================== ________________________________ test_answer _________________________________ def test_answer(): > assert func(3) == 5 E assert 4 == E + where 4 = func(3) test_api.py:9: AssertionError ============================= 1 Failed in 0.23s =============================
此测试返回失败报告，因为 func(3) 不返 5 .
如何编写pytest测试样例
