Added plain tests for admin importing

polymorphic/tests/__init__.py

@@ -411,6 +411,7 @@ class DateModel(PolymorphicModel):
 
 
 # Import tests
+from .test_admin import *
 from .test_orm import *
 from .test_multidb import *
 from .test_regression import *

polymorphic/tests/test_admin.py

@@ -0,0 +1,31 @@
+from django.contrib.admin import AdminSite
+from django.test import TestCase
+
+from polymorphic.admin import PolymorphicParentModelAdmin, PolymorphicChildModelAdmin, PolymorphicChildModelFilter
+from polymorphic.tests import Model2A, Model2B, Model2C, Model2D
+
+
+class MultipleDatabasesTests(TestCase):
+
+    def test_admin_registration(self):
+        """
+        Test how the registration works
+        """
+        class Model2Admin(PolymorphicParentModelAdmin):
+            base_model = Model2A
+            list_filter = (PolymorphicChildModelFilter,)
+            child_models = (Model2B, Model2C, Model2D)
+
+        class Model2ChildAdmin(PolymorphicChildModelAdmin):
+            base_model = Model2A
+            base_fieldsets = (
+                ("Base fields", {
+                    'fields': ('field1',)
+                }),
+            )
+
+        admin_site = AdminSite()
+        admin_site.register(Model2A, Model2Admin)
+        admin_site.register(Model2B, Model2ChildAdmin)
+        admin_site.register(Model2C, Model2ChildAdmin)
+        admin_site.register(Model2D, Model2ChildAdmin)