fixture的参数可以解决大量重复代码工作,比如数据库的连接、查询、关闭等.同样可以使用参数化来测试多条数据用例

例一、

import pytest

@pytest.fixture(params=[("redis", "6379"), ("elasticsearch", "9200")])

def params(request):

return request.param

@pytest.fixture()

def db(params):

print(f"\nuse to connection: {params}")

yield

print(f"\nclose to connection:{params}")

@pytest.mark.usefixtures("db")

def test_demo():

assert 1 == 1

运行结果:

╰ pytest -v -s test_data.py

======================================================= test session starts ========================================================

platform darwin -- Python 3.7.4, pytest-4.4.0, py-1.8.0, pluggy-0.13.0 -- /Users/zhouwanghua/Code/Leyan/python/robocop/bin/python

cachedir: .pytest_cache

metadata: {'Python': '3.7.4', 'Platform': 'Darwin-18.6.0-x86_64-i386-64bit', 'Packages': {'pytest': '4.4.0', 'py': '1.8.0', 'pluggy': '0.13.0'}, 'Plugins': {'bdd': '3.1.0', 'html': '1.20.0', 'metadata': '1.8.0'}}

rootdir: /Users/zhouwanghua/Code/Leyan/robocop, inifile: pytest.ini

plugins: bdd-3.1.0, html-1.20.0, metadata-1.8.0

collected 2 items

test_data.py::test_demo[params0]

use to connection: ('redis', '6379')

PASSED

close to connection:('redis', '6379')

test_data.py::test_demo[params1]

use to connection: ('elasticsearch', '9200')

PASSED

close to connection:('elasticsearch', '9200')

===================================================== 2 passed in 0.03 seconds =====================================================

例二、

import pytest

@pytest.fixture(params=[1, 2])

def data(request):

"""

:param request:

"""

return request.param

def test_data(data):

print(f"data:{data}")

运行结果:

╰ pytest -v -s test_data.py

======================================================= test session starts ========================================================

platform darwin -- Python 3.7.4, pytest-4.4.0, py-1.8.0, pluggy-0.13.0 -- /Users/zhouwanghua/Code/Leyan/python/robocop/bin/python

cachedir: .pytest_cache

metadata: {'Python': '3.7.4', 'Platform': 'Darwin-18.6.0-x86_64-i386-64bit', 'Packages': {'pytest': '4.4.0', 'py': '1.8.0', 'pluggy': '0.13.0'}, 'Plugins': {'bdd': '3.1.0', 'html': '1.20.0', 'metadata': '1.8.0'}}

rootdir: /Users/zhouwanghua/Code/Leyan/robocop, inifile: pytest.ini

plugins: bdd-3.1.0, html-1.20.0, metadata-1.8.0

collected 2 items

test_data.py::test_data[1] data:1

PASSED

test_data.py::test_data[2] data:2

PASSED

===================================================== 2 passed in 0.02 seconds =====================================================