gh-138313: Suppress ResourceWarnings and restore skipped test (#138597)

Lib/test/test_importlib/metadata/_issue138313.py

@@ -1,15 +0,0 @@
-import os
-import unittest
-
-
-def skip_on_buildbot(func):
-    """
-    #132947 revealed that after applying some otherwise stable
-    changes, only on some buildbot runners, the tests will fail with
-    ResourceWarnings.
-    """
-    # detect "not github actions" as a proxy for BUILDBOT not being present yet.
-    is_buildbot = "GITHUB_ACTION" not in os.environ or "BUILDBOT" in os.environ
-    skipper = unittest.skip("Causes Resource Warnings (python/cpython#132947)")
-    wrapper = skipper if is_buildbot else lambda x: x
-    return wrapper(func)

Lib/test/test_importlib/metadata/fixtures.py

@@ -374,6 +374,8 @@ def setUp(self):
         # Add self.zip_name to the front of sys.path.
         self.resources = contextlib.ExitStack()
         self.addCleanup(self.resources.close)
+        # workaround for #138313
+        self.addCleanup(lambda: None)
 
 
 def parameterize(*args_set):

Lib/test/test_importlib/metadata/test_main.py

@@ -22,7 +22,6 @@
 )
 
 from . import fixtures
-from . import _issue138313
 from ._path import Symlink
 
 
@@ -358,7 +357,6 @@ def test_packages_distributions_example(self):
         self._fixture_on_path('example-21.12-py3-none-any.whl')
         assert packages_distributions()['example'] == ['example']
 
-    @_issue138313.skip_on_buildbot
     def test_packages_distributions_example2(self):
         """
         Test packages_distributions on a wheel built

Misc/NEWS.d/next/Tests/2025-09-21-16-00-30.gh-issue-138313.lBx2en.rst

@@ -0,0 +1,2 @@
+Restore skipped test and add janky workaround to prevent select buildbots
+from failing with a ResourceWarning.