pytest-dev / pytest-dev/pytest
Fixtures without name matching magic
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Description
I've been happily using pytest for several projects for the past few years.
There's one part about pytest that I still struggle to get behind: The way that fixtures magically match argument names to fixtures -- and apparently I'm not alone in this feeling. I would much rather declare dependencies explicitly in some way using code. I know this would be more verbose, but that's a tradeoff I'm happy to make.
Is it possible to do this in some way with pytest today? If not, would you be open to adding an optional feature for this?
I was thinking perhaps something like the following, using an example adapted from the docs:
import pytest
@pytest.fixture
def smtp_connection():
import smtplib
return smtplib.SMTP("smtp.gmail.com", 587, timeout=5)
@pytest.use_fixture(smtp_connection)
def test_ehlo(connection):
response, msg = connection.ehlo()
assert response == 250
assert 0 # for demo purposes
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reviewing the linked pytest fixture documentation and the 103-comment discussion to determine whether explicit fixture dependencies are supported or agreed upon. Compare the proposed @pytest.use_fixture(smtp_connection) example with current pytest behavior; done would require a settled optional API design and an accepted implementation plan.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- testing-qa
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100