Fixed the ModelMultipleChoiceFieldTests to pass even on DB backends that do not reuse pk values after rollback.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14928 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/model_forms_regress/tests.py

@@ -37,7 +37,8 @@ class ModelMultipleChoiceFieldTests(TestCase):
 
         f = forms.ModelMultipleChoiceField(queryset=Person.objects.all(),
                                            validators=[my_validator])
-        f.clean([1,2])
+
+        f.clean([p.pk for p in Person.objects.all()[8:9]])
         self.assertTrue(self._validator_run)
 
 class TripleForm(forms.ModelForm):