Renamed a couple models to prevent duplicate names.

        """

        Test for issue 10405

        """

        class A(models.Model):

            ref = models.ForeignKey("B")

        class C(models.Model):

            ref = models.ForeignKey("D")

        class B(models.Model):

        class D(models.Model):

            pass

        class Meta:

            model = A

            model = C

            fields = '__all__'

        self.assertTrue(issubclass(ModelFormMetaclass(str('Form'), (ModelForm,), {'Meta': Meta}), ModelForm))