Refs #27753 -- Deprecated django.utils.text.unescape_entities().

The function was undocumented and only required for compatibility with
Python 2.

Code should use Python's html.unescape() that was added in Python 3.4.

tests/utils_tests/test_text.py

@@ -1,8 +1,9 @@
 import json
 import sys
 
-from django.test import SimpleTestCase
+from django.test import SimpleTestCase, ignore_warnings
 from django.utils import text
+from django.utils.deprecation import RemovedInDjango40Warning
 from django.utils.functional import lazystr
 from django.utils.text import format_lazy
 from django.utils.translation import gettext_lazy, override
@@ -184,6 +185,7 @@ class TestUtilsText(SimpleTestCase):
         # interning the result may be useful, e.g. when fed to Path.
         self.assertEqual(sys.intern(text.slugify('a')), 'a')
 
+    @ignore_warnings(category=RemovedInDjango40Warning)
     def test_unescape_entities(self):
         items = [
             ('', ''),
@@ -200,6 +202,14 @@ class TestUtilsText(SimpleTestCase):
             self.assertEqual(text.unescape_entities(value), output)
             self.assertEqual(text.unescape_entities(lazystr(value)), output)
 
+    def test_unescape_entities_deprecated(self):
+        msg = (
+            'django.utils.text.unescape_entities() is deprecated in favor of '
+            'html.unescape().'
+        )
+        with self.assertWarnsMessage(RemovedInDjango40Warning, msg):
+            text.unescape_entities('foo')
+
     def test_unescape_string_literal(self):
         items = [
             ('"abc"', 'abc'),