def METHOD_NAME(self):
    self.assertEqual(1, len(FieldOfScience.objects.all()))
    fos_obj = self.data.unsaved_object
    fos_obj.fos_nsf_abbrev = ''
    fos_obj.save()
    self.assertEqual(2, len(FieldOfScience.objects.all()))
    retrieved_obj = FieldOfScience.objects.get(pk=fos_obj.pk)
    self.assertEqual('', retrieved_obj.fos_nsf_abbrev)