python - 如何以交互方式获取 pytest fixture？

Question

如何在不使用断点的情况下导入或绑定(bind) pytest fixture 以供交互使用？

例如，我想探索 tmpdir_factory 的一些行为REPL 中的 fixture 。

from pytest import tmpdir_factory  # note: this doesn't actually work

# setup / context has already been entered
tmpdir_factory.ensure('exists.txt', file=True)  # I can use the fixture
del tmpdir_factory  # teardown will eventually be called

在 tmpdir 的情况下，我已经知道它只是一个 py.path.local 实例，但我也对用户定义的固定装置的一般问题感兴趣。

---

编辑:另一个可接受的接口(interface):

from magical_module import inject_fixture
tmpdir_factory = inject_fixture('tmpdir_factory')

---

编辑一个 MCVE 以显示上下文是否已退出:

# conftest.py
from datetime import datetime
import pytest

@pytest.fixture
def my_fixture():
    obj = {'setup': datetime.now()}
    yield (obj, f'yielded @ {datetime.now()!r}')
    obj['teardown'] = datetime.now()

Answer 1

Call IPython.embed() to drop into IPython's REPL ，并使用 request fixture's getfixturevalue()访问任意 fixture 值的方法

def test_stuff(request):
    from IPython import embed
    embed()

注意:pytest 必须使用-s 标志 运行到disable capturing of stdout/stderr

$ pytest -s
============================= test session starts ==============================
platform linux -- Python 3.6.2, pytest-3.2.1, py-1.4.34, pluggy-0.4.0
rootdir: /home/they4kman/.virtualenvs/tmp-26171665bd77f5/src, inifile:
collected 1 item                                                                

test_stuff.py Python 3.6.2 (default, Jul 20 2017, 08:43:29) 
Type 'copyright', 'credits' or 'license' for more information
IPython 6.1.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: request.getfixturevalue('tmpdir_factory')
Out[1]: <_pytest.tmpdir.TempdirFactory at 0x7f71a7d501d0>

IPython must be installed , 当然 ;)