在 pytest 中，如何访问传递给测试的参数? [英] In pytest, how can I access the parameters passed to a test?

问题描述

在 pytest 中，我可以将参数传递给测试(使用夹具或装饰器 @pytest.fixture(params=list-of-params)).

In pytest, I can pass parameters to test (using fixtures or the decorator @pytest.fixture(params=list-of-params)).

测试完成后，如果测试失败，则通过的参数显示在结果中，如 TestCheckoutPage.test_address_edit[True] 或 False 如果这是假的.

When the tests are done, if a test fails, the parameter that was passed is shown on the results, as in TestCheckoutPage.test_address_edit[True] or False if it was false.

如何访问这些参数并将它们添加到终结器中?request.param 似乎不起作用，即使这是制作夹具时获取参数的方式:

How can I access those parameters and add them to a finalizer? request.param doesn't seem to work, even though that is how you would get the parameter when making a fixture:

@pytest.fixture(params=[True, False])
def user(request):
    return request.param

那行得通.但是，如果我尝试将其传递给测试:

That works. But if I try to pass it to a test:

class TestClass:
    def test_something(self, user):
        pass

然后，使用自动使用装置来收集有关它的信息:

And then, using an autouse fixture to collect info on it:

@pytest.fixture(autouse=True)
def set_driver(self, request):
    print request.param

这会抛出一个错误，说FixtureRequest 中没有param.

That throws an error, saying there is no param in FixtureRequest.

有什么办法可以恢复那个参数吗?我试图让 Selenium 在测试失败时截取屏幕截图，但是因为带有参数的测试具有相同的名称和类名等等，它正在为第一次执行编写一个文件，然后在第二次、第三次、...，时间.所以我想将参数添加到文件名中以避免这种情况.

Is there a way that I can get that parameter back? I'm trying to have Selenium take a screenshot when tests fail, but because tests with parameters have the same name and classname and all, it is writing a file for the first execution, and then overwriting it the second, third, ..., time around. So I would like to add the parameter to the file name to avoid this.

谢谢！

推荐答案

确实，request.param 仅在定义了参数化的夹具函数中可用.如果您需要 set_driver 固定装置中的 user，您可以试试这个:

Indeed,request.param is only available in the fixture function where the parametrization is defined. If you need user in the set_driver fixture you can try this:

import pytest

@pytest.fixture(params=[True, False])
def user(request):
    return request.param

class TestHello:
    @pytest.fixture(autouse=True)
    def set_driver(self, user):
        print "set_driver sees", user

    def test_method(self):
        assert 0

如果您只想让 set_driver 在 user 实际参与测试时做一些事情，那么您可以这样做:

If you only want to have set_driver do something if user is actually involved in the test, then you could do something like this:

import pytest

@pytest.fixture(params=[True, False], scope="module")
def user(request):
    return request.param

@pytest.fixture(autouse=True)
def set_driver(request):
    if "user" in request.fixturenames:
        user = request.getfuncargvalue("user")
        print "set_driver sees", user


def test_function(user):
    assert 0

def test_function_nouser():
    assert 0

这篇关于在 pytest 中，如何访问传递给测试的参数?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！