pytest-dev / pytest-dev/pytest-xdist

pytest -f does not notice new tests

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Description

move of pytest-dev/pytest#532

pytest -f appears to latch to the set of test cases on first run and does not detect when new test is added.

e.g. test_foo.py:
def test foo(): assert 0

run pytest -f test_foo.py
(one test failing)

edit test_foo.py, add
def test_bar(): assert 0

(still only one test failing)

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Research direction

Reproduce the behavior with the test_foo.py example and pytest -f, first confirming that the initial run reports one failing test and the added test is ignored. Trace the loop-on-failures handling for this command, then add coverage showing that test_bar is detected and reported on a subsequent iteration.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
testing
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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