Refs #34305 -- Added SimpleTestCase.enterClassContext() on Python < 3.11.

django/test/testcases.py

@@ -51,6 +51,7 @@ from django.test.utils import (
     override_settings,
 )
 from django.utils.functional import classproperty
+from django.utils.version import PY311
 from django.views.static import serve
 
 logger = logging.getLogger("django.test")
@@ -64,6 +65,24 @@ __all__ = (
 )
 
 
+if not PY311:
+    # Backport of unittest.case._enter_context() from Python 3.11.
+    def _enter_context(cm, addcleanup):
+        # Look up the special methods on the type to match the with statement.
+        cls = type(cm)
+        try:
+            enter = cls.__enter__
+            exit = cls.__exit__
+        except AttributeError:
+            raise TypeError(
+                f"'{cls.__module__}.{cls.__qualname__}' object does not support the "
+                f"context manager protocol"
+            ) from None
+        result = enter(cm)
+        addcleanup(exit, cm, None, None, None)
+        return result
+
+
 def to_list(value):
     """Put value into a list if it's not already one."""
     if not isinstance(value, list):
@@ -312,6 +331,12 @@ class SimpleTestCase(unittest.TestCase):
         """Perform post-test things."""
         pass
 
+    if not PY311:
+        # Backport of unittest.TestCase.enterClassContext() from Python 3.11.
+        @classmethod
+        def enterClassContext(cls, cm):
+            return _enter_context(cm, cls.addClassCleanup)
+
     def settings(self, **kwargs):
         """
         A context manager that temporarily sets a setting and reverts to the