bpo-44784: Apply changes from importlib_metadata 4.6.3 (GH-27508)

Addressing issues with tests under error on warnings.

Automerge-Triggered-By: GH:jaraco

Author: jaraco

Lib/test/test_importlib/test_metadata_api.py

@@ -3,6 +3,7 @@
 import unittest
 import warnings
 import importlib
+import contextlib
 
 from . import fixtures
 from importlib.metadata import (
@@ -17,6 +18,13 @@
 )
 
 
+@contextlib.contextmanager
+def suppress_known_deprecation():
+    with warnings.catch_warnings(record=True) as ctx:
+        warnings.simplefilter('default')
+        yield ctx
+
+
 class APITests(
     fixtures.EggInfoPkg,
     fixtures.DistInfoPkg,
@@ -118,8 +126,7 @@ def test_entry_points_dict_construction(self):
         # Prior versions of entry_points() returned simple lists and
         # allowed casting those lists into maps by name using ``dict()``.
         # Capture this now deprecated use-case.
-        with warnings.catch_warnings(record=True) as caught:
-            warnings.filterwarnings("default", category=DeprecationWarning)
+        with suppress_known_deprecation() as caught:
             eps = dict(entry_points(group='entries'))
 
         assert 'main' in eps
@@ -138,8 +145,7 @@ def test_entry_points_by_index(self):
         See python/importlib_metadata#300 and bpo-44246.
         """
         eps = distribution('distinfo-pkg').entry_points
-        with warnings.catch_warnings(record=True) as caught:
-            warnings.filterwarnings("default", category=DeprecationWarning)
+        with suppress_known_deprecation() as caught:
             eps[0]
 
         # check warning
@@ -151,7 +157,7 @@ def test_entry_points_groups_getitem(self):
         # Prior versions of entry_points() returned a dict. Ensure
         # that callers using '.__getitem__()' are supported but warned to
         # migrate.
-        with warnings.catch_warnings(record=True):
+        with suppress_known_deprecation():
             entry_points()['entries'] == entry_points(group='entries')
 
             with self.assertRaises(KeyError):
@@ -161,7 +167,7 @@ def test_entry_points_groups_get(self):
         # Prior versions of entry_points() returned a dict. Ensure
         # that callers using '.get()' are supported but warned to
         # migrate.
-        with warnings.catch_warnings(record=True):
+        with suppress_known_deprecation():
             entry_points().get('missing', 'default') == 'default'
             entry_points().get('entries', 'default') == entry_points()['entries']
             entry_points().get('missing', ()) == ()

Misc/NEWS.d/next/Library/2021-07-31-08-45-31.bpo-44784.fIMIDS.rst

@@ -0,0 +1,2 @@
+In importlib.metadata tests, override warnings behavior under expected
+DeprecationWarnings (importlib_metadata 4.6.3).