from django.test import TestCase
from myapp.users.models import User
from ..models import Book

class ModelTests(TestCase):
    def setup(self):
        self.username = 'john'
        self.password = '123'
        self.user = User.objects.create(name=self.username,
                                        password=self.password
                                       )

    def test_create_book(self):
        Book.objects.create(artist=self.user,
                            title=“An Art Book“,
                            category=“Art”,
                            )
        self.assertEquals(Book.objects.all().count(), 1)

Book.objects.create(artist=self.user,
AttributeError: 'ModelTests' object has no attribute 'user'