# myapp/views.py

from rest_framework.views import APIView
from rest_framework.permissions import IsAdminUser
from myapp.permissions import MyPermission


class MyView(APIView):
    permission_classes = [MyPermission | IsAdminUser]
    # ...

# myapp/tests/views/test_my_view.py

from myapp.views import MyView
from rest_framework.permissions import IsAdminUser
from myapp.permissions import MyPermission


def test__permission_classes():
    cls = MyView
    assert cls.permission_classes == [MyPermission | IsAdminUser]