conftest.py是什么?  可以理解成专门存放fixture的配置文件，单独管理一些全局的fixture

运用场景

自动化测试过程中所有用例都需要用登录功能来作为前置操作, 那就可以把登录功能通过fixture写到conftest.py, 全局调用

注意事项

 1. pytest会默认读取conftest.py里面的所有fixture
 2. conftest.py 文件名称是固定的,不能修改
 3. conftest.py只对该目录下的测试用例与子目录中的测试用例生效
 4. 不同目录可以有自己的conftest.py, 一个项目中可以有多个conftest.py
 5. 测试用例文件中不需要手动import conftest.py, pytest会自动查找
 6. 不同级别的conftest.py文件fixture的name参数相同,子目录下的fixture会覆盖父目录下的fixture

案例

Demo
|__testCase
|   |__test_conftest
|   |   |__test_01.py
|   |   |__conftest.py
|   |__conftest.py
|__conftest.py

Demo/conftest.py代码

#!/usr/bin/python3
# coding=utf-8
# Author: 文

import pytest

@pytest.fixture(scope='session', name="get_path_session")
def get_path_session():
    print(" ===>  get_path_session")
    token = '%gh$gf>dfehfeuhfeofh'
    print(" 获得登录token: %s" % token)
    yield
    print(" 测试完成 Log_out")

Demo/testCase/conftest.py代码

#!/usr/bin/python3
# coding=utf-8
# Author: 文

from os.path import realpath
import pytest

@pytest.fixture(scope='class', name="get_path_class")
def get_path_class():
    print(" ===>  get_path_class")
    yield
    print(' 获得fixture class path: %s' % realpath(__file__))

Demo/testCase/test_conftest/conftest.py代码

#!/usr/bin/python3
# coding=utf-8
# Author: 文

from os.path import realpath
import pytest

@pytest.fixture(scope='function', name="get_path_function")
def get_path_function():
    print(" ===>  get_path_function")
    yield
    print(' 获得fixture path function: %s' % realpath(__file__))

Demo/testCase/test_conftest/test_conftest.py代码

#!/usr/bin/python3
# coding=utf-8
# Author: 文

import pytest

@pytest.mark.usefixtures("get_path_class", "get_path_session")
class Test_A():
    @pytest.mark.usefixtures("get_path_function")
    def test_01(self):
        print(" =====> test_01")

    @pytest.mark.usefixtures("get_path_function")
    def test_02(self):
        print(" =====> test_02")

@pytest.mark.usefixtures("get_path_class", "get_path_session")
class Test_B():
    @pytest.mark.usefixtures("get_path_function")
    def test_03(self):
        print(" =====> test_03")

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

打印结果如下：

test_conftest.py::Test_A::test_01 PASSED
test_conftest.py::Test_A::test_02 PASSED
test_conftest.py::Test_B::test_03 PASSED
2020-11-29 10:14:25,227 - root - INFO -  ===>  get_path_session
2020-11-29 10:20:09,285 - root - INFO -  获得登录token: %gh$gf>dfehfeuhfeofh
2020-11-29 10:14:25,227 - root - INFO -  ===>  get_path_class
2020-11-29 10:14:25,228 - root - INFO -  ===>  get_path_function
2020-11-29 10:14:25,228 - root - INFO -  =====> test_01
2020-11-29 10:14:25,229 - root - INFO -  获得fixture path function: F:\Demo\testCase\test_conftest\conftest.py
2020-11-29 10:14:25,230 - root - INFO -  ===>  get_path_function
2020-11-29 10:14:25,231 - root - INFO -  =====> test_02
2020-11-29 10:14:25,232 - root - INFO -  获得fixture path function: F:\Demo\testCase\test_conftest\conftest.py
2020-11-29 10:14:25,233 - root - INFO -  获得fixture class path: F:\Demo\testCase\conftest.py
2020-11-29 10:14:25,235 - root - INFO -  ===>  get_path_class
2020-11-29 10:14:25,235 - root - INFO -  ===>  get_path_function
2020-11-29 10:14:25,236 - root - INFO -  =====> test_03
2020-11-29 10:14:25,237 - root - INFO -  获得fixture path function: F:\Demo\testCase\test_conftest\conftest.py
2020-11-29 10:14:25,237 - root - INFO -  获得fixture class path: F:\Demo\testCase\conftest.py
2020-11-29 10:20:09,298 - root - INFO -  测试完成 Log_out