Added test for proxy model safeguards on swappable models.

tests/modeltests/proxy_models/tests.py

@@ -1,5 +1,6 @@
 from __future__ import absolute_import, unicode_literals
 
+from django.conf import settings
 from django.contrib.contenttypes.models import ContentType
 from django.core import management
 from django.core.exceptions import FieldError
@@ -13,6 +14,7 @@ from .models import (MyPerson, Person, StatusPerson, LowerStatusPerson,
     Country, State, StateProxy, TrackerUser, BaseUser, Bug, ProxyTrackerUser,
     Improvement, ProxyProxyBug, ProxyBug, ProxyImprovement)
 
+
 class ProxyModelTests(TestCase):
     def test_same_manager_queries(self):
         """
@@ -138,10 +140,32 @@ class ProxyModelTests(TestCase):
         def build_new_fields():
             class NoNewFields(Person):
                 newfield = models.BooleanField()
+
                 class Meta:
                     proxy = True
         self.assertRaises(FieldError, build_new_fields)
 
+    def test_swappable(self):
+        try:
+            settings.TEST_SWAPPABLE_MODEL = 'proxy_models.AlternateModel'
+
+            class SwappableModel(models.Model):
+
+                class Meta:
+                    swappable = 'TEST_SWAPPABLE_MODEL'
+
+            class AlternateModel(models.Model):
+                pass
+
+            # You can't proxy a swapped model
+            with self.assertRaises(TypeError):
+                class ProxyModel(SwappableModel):
+
+                    class Meta:
+                        proxy = True
+        finally:
+            del settings.TEST_SWAPPABLE_MODEL
+
     def test_myperson_manager(self):
         Person.objects.create(name="fred")
         Person.objects.create(name="wilma")