[6.0.x] Fixed #36961 -- Fixed TypeError in deprecation warnings if Django is imported by namespace.

Backport of c1d8646ec219b8b90ebdd463f40e5767876658a0 from main.

1 files changed, 4 insertions, 0 deletions

diff --git a/tests/deprecation/tests.py b/tests/deprecation/tests.py
index 2df9cc6fa2..ac610b4928 100644
--- a/tests/deprecation/tests.py
+++ b/tests/deprecation/tests.py
@@ -18,6 +18,10 @@ class DjangoFilePrefixesTests(SimpleTestCase):
     def test_no_file(self):
         orig_file = django.__file__
         try:
+            # Depending on the cwd, Python might give a local checkout
+            # precedence over installed Django, producing None.
+            django.__file__ = None
+            self.assertEqual(django_file_prefixes(), ())
             del django.__file__
             self.assertEqual(django_file_prefixes(), ())
         finally: