Commits on Mar 3, 2022

1. stubtest: Fix wrong assumption about relative path …

   Description:
   `run_stubtest` creates temp directory and prepend `sys.path` with
   relative path (dot `.`) wrongly assuming that the dot will be
   resolved to absolute path on *every* import attempt.
   
   But in Python dot(`.`) in sys.path is actually resolved by
   PathFinder and cached in `sys.path_importer_cache` like:
   ```
   sys.path_importer_cache['.']
   FileFinder('/somepath/.')
   ```
   later calls for `find_module` return None and import of
   `test_module` fails.
   
   This resulted in only the first test in stubtest's suite passed in
   non-pytest-xdist environments.
   
   This issue was hidden with bug or feature in pytest-xdist < 2.3.0:
   pytest-dev/pytest-xdist#421
   
   It was fixed in pytest-xdist 2.3.0:
   pytest-dev/pytest-xdist#667
   
   - sys.path for pytest-xdist < 2.3.0
     `'.', 'project_path', ''`
   
   - sys.path for pytest-xdist >= 2.3.0 or without xdist
     `'.', 'project_path'`
   
   Fix:
   In Python for denoting cwd the empty path `''` can be used as a
   special case, but for readability `sys.path` is prepended with
   resolved absolute path of temp directory. Also it's essential to
   restore back `sys.path` after a test to not break subsequent tests.
   
   Fixes: python#11019
   Signed-off-by: Stanislav Levin <slev@altlinux.org>

   

   stanislavlevin committed Mar 3, 2022
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