From 07d894d96777e77f9dac3ec671f2dce4c584a26d Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Wed, 20 Mar 2024 13:49:52 -0400
Subject: [PATCH] Copy backport of isolated_modules from importlib_resources.

---
 tests/compat/py312.py | 18 ++++++++++++++++++
 tests/compat/py39.py  |  1 +
 2 files changed, 19 insertions(+)
 create mode 100644 tests/compat/py312.py

diff --git a/tests/compat/py312.py b/tests/compat/py312.py
new file mode 100644
index 00000000..ea9a58ba
--- /dev/null
+++ b/tests/compat/py312.py
@@ -0,0 +1,18 @@
+import contextlib
+
+from .py39 import import_helper
+
+
+@contextlib.contextmanager
+def isolated_modules():
+    """
+    Save modules on entry and cleanup on exit.
+    """
+    (saved,) = import_helper.modules_setup()
+    try:
+        yield
+    finally:
+        import_helper.modules_cleanup(saved)
+
+
+vars(import_helper).setdefault('isolated_modules', isolated_modules)
diff --git a/tests/compat/py39.py b/tests/compat/py39.py
index 0f6f9c3a..5fe61c39 100644
--- a/tests/compat/py39.py
+++ b/tests/compat/py39.py
@@ -4,3 +4,4 @@
 os_helper = try_import('os_helper') or from_test_support(
     'FS_NONASCII', 'skip_unless_symlink'
 )
+import_helper = try_import('import_helper') or from_test_support()