gh-120801: Refactor importlib.metadata fixtures. (#120803)

These changes released with importlib_metadata 7.2.0.

Lib/test/test_importlib/metadata/fixtures.py

@@ -1,10 +1,8 @@
-import os
 import sys
 import copy
 import json
 import shutil
 import pathlib
-import tempfile
 import textwrap
 import functools
 import contextlib
@@ -27,29 +25,12 @@ except (ImportError, AttributeError):
 
 
 @contextlib.contextmanager
-def tempdir():
-    tmpdir = tempfile.mkdtemp()
-    try:
-        yield pathlib.Path(tmpdir)
-    finally:
-        shutil.rmtree(tmpdir)
-
-
-@contextlib.contextmanager
-def save_cwd():
-    orig = os.getcwd()
-    try:
-        yield
-    finally:
-        os.chdir(orig)
-
-
-@contextlib.contextmanager
-def tempdir_as_cwd():
-    with tempdir() as tmp:
-        with save_cwd():
-            os.chdir(str(tmp))
-            yield tmp
+def tmp_path():
+    """
+    Like os_helper.temp_dir, but yields a pathlib.Path.
+    """
+    with os_helper.temp_dir() as path:
+        yield pathlib.Path(path)
 
 
 @contextlib.contextmanager
@@ -70,7 +51,7 @@ class Fixtures:
 class SiteDir(Fixtures):
     def setUp(self):
         super().setUp()
-        self.site_dir = self.fixtures.enter_context(tempdir())
+        self.site_dir = self.fixtures.enter_context(tmp_path())
 
 
 class OnSysPath(Fixtures):

Lib/test/test_importlib/metadata/test_api.py

@@ -109,7 +109,7 @@ class APITests(
         Entry points should only be exposed for the first package
         on sys.path with a given name (even when normalized).
         """
-        alt_site_dir = self.fixtures.enter_context(fixtures.tempdir())
+        alt_site_dir = self.fixtures.enter_context(fixtures.tmp_path())
         self.fixtures.enter_context(self.add_sys_path(alt_site_dir))
         alt_pkg = {
             "DistInfo_pkg-1.1.0.dist-info": {

Lib/test/test_importlib/metadata/test_main.py

@@ -138,7 +138,7 @@ class NameNormalizationTests(fixtures.OnSysPath, fixtures.SiteDir, unittest.Test
         fixtures.build_files(self.make_pkg('abc'), self.site_dir)
         before = list(_unique(distributions()))
 
-        alt_site_dir = self.fixtures.enter_context(fixtures.tempdir())
+        alt_site_dir = self.fixtures.enter_context(fixtures.tmp_path())
         self.fixtures.enter_context(self.add_sys_path(alt_site_dir))
         fixtures.build_files(self.make_pkg('ABC'), alt_site_dir)
         after = list(_unique(distributions()))

Misc/NEWS.d/next/Tests/2024-06-20-12-51-26.gh-issue-120801.lMVXC9.rst

@@ -0,0 +1,2 @@
+Cleaned up fixtures for importlib.metadata tests and consolidated behavior
+with 'test.support.os_helper'.