我可以使用其他灯具参数化pytest灯具吗? [英] Can I parameterize a pytest fixture with other fixtures?

问题描述

我有一个python测试，该测试使用用于凭证的夹具(用户ID和密码的元组)

I have a python test that uses a fixture for credentials (a tuple of userid and password)

def test_something(credentials)
   (userid, password) = credentials
   print("Hello {0}, welcome to my test".format(userid))

并且我有用于证书的pytest固定装置:

and I have pytest fixture for credentials:

@pytest.fixture()
def credentials():
   return ("my_userid", "my_password")

效果很好

现在，我想将其扩展为多个凭证(例如登台和生产)，以便我的测试将运行两次(每个登台和生产一次).

Now I want to extend this for multiple credentials (say staging and production) so that my test will run twice (once each for staging and production).

我以为参数化是答案，但是似乎我无法使用灯具进行参数化.

I thought that parameterization was the answer, but it seems I can't parameterize with fixtures.

我想做这样的事情:

@pytest.fixture(params=[staging_credentials, production_credentials])
def credentials(request):
    return request.param

其中staging_credentials和production_credentials都是固定装置:

where staging_credentials and production_credentials are all fixtures:

@pytest.fixture()
def staging_credentials():
   return ("staging_userid", "staging_password")

@pytest.fixture()
def production_credentials():
   return ("prod_userid", "prod_password")

但是显然夹具的参数不能是其他夹具.

but apparently parameters to the fixture can't be other fixtures.

关于如何优雅地处理此问题的任何建议?我看过 https://docs.pytest.org/en/latest/proposal/parametrize_with_fixtures.html ，但这似乎太过残酷了.

Any suggestions on how to elegantly handle this? I've looked at https://docs.pytest.org/en/latest/proposals/parametrize_with_fixtures.html but that seems a but too brute force.

谢谢！ 史蒂夫

推荐答案

间接参数化就是答案.因此，灯具的参数可以是其他灯具(按其名称/代码).

Indirect parametrization is the answer. So, the parameters to the fixtures CAN be other fixtures (by their name/code).

import pytest

all_credentials = {
    'staging': ('user1', 'pass1'),
    'prod': ('user2', 'pass2'),
}

@pytest.fixture
def credentials(request):
    return all_credentials[request.param]

@pytest.mark.parametrize('credentials', ['staging', 'prod'], indirect=True)
def test_me(credentials):
    pass

从技术上讲，您不仅可以通过其键获取dict值，还可以基于request.param生成credentials结果，并且该参数将成为传递给测试的同名参数的值.

Technically, you can not only get a dict value by its key, but generate the credentials result based on request.param, and this param will be the value passed to the same-name parameter of the test.

如果要使用其他固定装置(可能是由于设置/拆卸阶段，这是这样做的唯一原因):

If you want other fixtures to be used (probably because of the setup/teardown stages, as this is the only reason to do so):

import pytest

@pytest.fixture
def credentials(request):
    return request.getfuncargvalue(request.param)

@pytest.fixture()
def staging_credentials():
   return ("staging_userid", "staging_password")

@pytest.fixture()
def production_credentials():
   return ("prod_userid", "prod_password")

@pytest.mark.parametrize('credentials', ['staging_credentials', 'production_credentials'], indirect=True)
def test_me(credentials):
    pass

此处，request.getfuncargvalue(...)将根据灯具名称动态返回灯具值.

Here, request.getfuncargvalue(...) will return a fixture value by the fixture name, dynamically.

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