Fixed #36943 -- Preserved any exception from URLconf module in autoreloader.

Co-authored-by: Jacob Walls <jacobtylerwalls@gmail.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/utils_tests/test_autoreload.py b/tests/utils_tests/test_autoreload.py
index c9e6443c6f..2033728da8 100644
--- a/tests/utils_tests/test_autoreload.py
+++ b/tests/utils_tests/test_autoreload.py
@@ -434,6 +434,18 @@ class TestCheckErrors(SimpleTestCase):
                 autoreload._exception = None
         self.assertEqual(mocked_error_files.append.call_count, 1)
 
+    def test_urlconf_exception_is_used_as_cause(self):
+        urlconf_exc = ValueError("Error")
+        fake_method = mock.MagicMock(side_effect=RuntimeError())
+        wrapped = autoreload.check_errors(fake_method)
+        with mock.patch.object(autoreload, "_url_module_exception", urlconf_exc):
+            try:
+                with self.assertRaises(RuntimeError) as cm:
+                    wrapped()
+            finally:
+                autoreload._exception = None
+        self.assertIs(cm.exception.__cause__, urlconf_exc)
+
 
 class TestRaiseLastException(SimpleTestCase):
     @mock.patch("django.utils.autoreload._exception", None)