Django GraphQL Test: How to test addition of new model fields?

I have a simple model as,

class Person(models.Model):
    first_name = models.CharField(max_length=20)

and I have setup the GraphQL to query the data,

import graphene
import graphene_django
from .models import Person


class PersonType(graphene_django.DjangoObjectType):
    class Meta:
        model = Person
        fields = '__all__'


class PersonQuery(graphene.ObjectType):
    persons = graphene.List(PersonType)

    def resolve_persons(*args, **kwargs):
        return Person.objects.all()

So far so good. Later I decided to write unittests for querying the persons data

from django.test import TestCase
from .models import Person
from .schema import schema


class TestGraphQLQuery(TestCase):

    @classmethod
    def setUpTestData(cls):
        cls.person = Person.objects.create(first_name="Jack")

    def test_person_query(self):
        query = """
            query{
              persons {
                id
                firstName
              }
            }
        """
        result = schema.execute(query).data
        expected = {'persons': [{'id': f'{self.person.pk}', 'firstName': self.person.first_name}]}
        self.assertEqual(result, expected)

and this too working.

Later, my model got updated with one additional field, age,

class Person(models.Model):
    first_name = models.CharField(max_length=20)
    age = models.IntegerField(default=0)

After the changes, I ran the unittests. As expected, it passes.

Question

How can I create the test case so that, the test should fail upon addition or removal of any fields?

Advantages of this test cases that I am seeking

1. We will get notified whenever a new field added to the model
2. We will get notified whenever a field removed or renamed
3. Generating dynamic graphql query will also help to verify the returned data from the schema.

from Django GraphQL Test: How to test addition of new model fields?