Py.test夹具:在量程夹具中使用功能夹具

Question

我正面临一个小问题与热测试装置，将感谢您的帮助。

我有几个功能装置，如下所述。为了简单起见，我没有展示实现。

@pytest.fixture()
def get_driver():
    pass

@pytest.fixture()
def login(get_driver):
    pass

@pytest.fixture()
def settings(login):
    pass

问题是，在运行第一个测试用例之前，我还需要一个(会话级)夹具来完成设置。(实际上开始测试)。即转到“设置”页面，创建几个设置。(登录后)

现在的问题是，我不能使用会话级别的这样做，因为我不能在会话级别使用函数级的夹具。，我可以吗？

@pytest.fixture(scope="session")
def setup(settings):
    settings.create_settings()
    pass

Answer 1

你需要一个解决办法。此操作需要在function作用域夹具中完成，autouse设置为True。

您需要在基于session的夹具中初始化一个变量，这将检查settings是否已经完成。如果未完成，则执行设置并将标志更改为False。

下面是一个有用的例子

import pytest


@pytest.fixture(scope="session", autouse=True)
def settings_page():
    config = {"config_done": False}
    return config


@pytest.fixture()
def init(request):
    print("init called")
    return "init"


@pytest.fixture()
def driver():
    print("driver called")

    return "driver"


@pytest.fixture(autouse=True)
def init_settings(settings_page, driver):
    if not settings_page["config_done"]:
        print("Settings being done only the first time")
        settings_page["config_done"] = True


@pytest.fixture()
def login():
    print("login called")
    return "login"


@pytest.fixture()
def logged_in_driver(init, driver, login):
    print("logged in driver is ready")
    return (init, driver, login)


@pytest.fixture()
def non_logged_in_driver(init, driver):
    print("non logged in driver is ready")
    return (init, driver)


def test_1(logged_in_driver):
    print("test_1")


def test_2(non_logged_in_driver):
    print("test_2")

输出如下：

test.py driver called
Settings being done only the first time
init called
login called
logged in driver is ready
.test_1
driver called
init called
non logged in driver is ready
.test_2

所以您可以看到设置只发生一次。

Answer 2

此解决方案试图在不创建会话级夹具的情况下实现相同的结果。它满足了您对设置为called only once before first test case的需求，正如您在上面的评论中提到的那样。

创建一个conftest.py并放置以下内容：

import pytest


def pytest_sessionstart(session):
    print("Initialising Session Level Settings")
    login = "A specialized login"
    settings(login).create_settings()


@pytest.fixture()
def get_driver():
    print("Get Driver")


@pytest.fixture()
def login(get_driver):
    print("Login")


@pytest.fixture()
def settings(login):
    print("Settings")

    class Setter:
        def create_settings(self):
            print("[Success] Settings created!")
    return Setter()

然后，您可以在您的测试中使用如下所示：

def test_one(settings):
    print("Test one...")


def test_two(settings):
    print("Test two...")

执行测试应该会产生接近您想要的效果(基于到目前为止我可以从您给定的信息中推断出什么)。

(py362) D:\repo\git\ens_qa>py.test -sv stackoverflow\ScopeWorkaroundTests.py
Initialising Session Level Settings
Settings
[Success] Settings created!
============================= test session starts =============================
platform win32 -- Python 3.6.2, pytest-3.2.1, py-1.4.34, pluggy-0.4.0 -- d:\virtualenv\py362\scripts\python.exe
cachedir: .cache
rootdir: D:\repo\git\ens_qa, inifile:
collected 2 items

stackoverflow/ScopeWorkaroundTests.py::test_one Get Driver
Login
Settings
Test one...
PASSED
stackoverflow/ScopeWorkaroundTests.py::test_two Get Driver
Login
Settings
Test two...
PASSED

========================== 2 passed in 0.05 seconds ===========================

(py362) D:\repo\git\ens_qa>

Answer 3

我认为最简单的方法是添加一些标志，然后使用自动设置，如下所示：

import pytest

flag = True

@pytest.fixture()
def get_driver():
    pass

@pytest.fixture()
def login(get_driver):
    pass

@pytest.fixture()
def settings(login):
    pass

@pytest.fixture(autouse = True)
def setup(settings):
    global flag
    if flag:
        settings.create_settings()
        flag = False
    pass