pytest内置fixture函数request.cls的使用

• 官方文档解释

• 源码（FixtureRequest类中）

    @property
    def cls(self):
        """Class (can be None) where the test function was collected."""
        if self.scope not in ("class", "function"):
            raise AttributeError(f"cls not available in {self.scope}-scoped context")
        clscol = self._pyfuncitem.getparent(_pytest.python.Class)
        if clscol:
            return clscol.obj

• 解读+示例

　request.cls 是获取测试函数的类名，当测试函数不在类内定义时则返回None，且scope范围应为class或者function,否则抛异常

示例1：返回None,测试函数定义在类外

import pytest

@pytest.fixture(scope="class")
def driver_init(request):
    print("*" * 20, request.cls)
    

def test_cls(driver_init):
    print("运行结束")

示例2：返回类，测试函数定义在类内

import pytest


@pytest.fixture(scope="class")
def driver_init(request):
    print("*" * 20, request.cls)


@pytest.mark.usefixtures("driver_init")
class Test_cls():

    def test_cls(self):
        print("运行结束")

• 其他使用

import pytest
from selenium import webdriver


@pytest.fixture(scope="class")
def driver_init(request):
    web_driver = webdriver.Chrome()
    request.cls.driver = web_driver
    yield
    web_driver.close()


@pytest.mark.usefixtures("driver_init")
class Test_cls():

    def test_cls(self):
        print("运行结束")