[1.7.x] Fixed #22979 -- Moved bug* tests

Backport of 11181a64f from master.

tests/admin_autodiscover/tests.py

@@ -0,0 +1,21 @@
+from unittest import TestCase
+
+from django.contrib import admin
+
+
+class AdminAutoDiscoverTests(TestCase):
+    """
+    Test for bug #8245 - don't raise an AlreadyRegistered exception when using
+    autodiscover() and an admin.py module contains an error.
+    """
+    def test_double_call_autodiscover(self):
+        # The first time autodiscover is called, we should get our real error.
+        with self.assertRaises(Exception) as cm:
+            admin.autodiscover()
+        self.assertEqual(str(cm.exception), "Bad admin module")
+
+        # Calling autodiscover again should raise the very same error it did
+        # the first time, not an AlreadyRegistered error.
+        with self.assertRaises(Exception) as cm:
+            admin.autodiscover()
+        self.assertEqual(str(cm.exception), "Bad admin module")