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pytest: TestCase failures reported as passing #91

Open
@simon-weber

Description

With this test suite:

# test_example.py
from unittest import TestCase
class TestExample(TestCase):
 def test_fail(self):
 assert False

Running works as expected:

$ pytest -p ciqueue.pytest --queue 'redis://localhost:6379/0?worker=0&build=repro&retry=0&timeout=10' test_example.py
========================================================= test session starts =========================================================
platform darwin -- Python 2.7.13, pytest-4.0.1, py-1.7.0, pluggy-0.6.0
...
collected 1 item
test_example.py F
============================================================== FAILURES ===============================================================
________________________________________________________ TestExample.test_fail ________________________________________________________
self = <test_example.TestExample testMethod=test_fail>
 def test_fail(self):
> assert False
E AssertionError: assert False
test_example.py:5: AssertionError
====================================================== 1 failed in 0.06 seconds =======================================================

However, reporting shows that the test passed:

$ pytest -p ciqueue.pytest_report --queue 'redis://localhost:6379/0?worker=0&build=repro&retry=0&timeout=10' test_example.py
========================================================= test session starts =========================================================
platform darwin -- Python 2.7.13, pytest-4.0.1, py-1.7.0, pluggy-0.6.0
...
collected 1 item
test_example.py . [100%]
====================================================== 1 passed in 0.02 seconds =======================================================

This appears to be due to ciqueue's makereport triggering before the one in pytest which is responsible for setting call.excinfo for TestCase-style tests.

From these docs it looks like:

  1. the ordering of multiple tryfirst=True hooks is undefined
  2. hookwrapper=True can execute code before a tryfirst hook

So, one fix could be to get pytest to switch to using hookwrapper. I figured I'd raise it with you folks first, though, in case it's something that's easier to fix on this end (by making ciqueue execute later, somehow).

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