django/tests/m2o_recursive/tests.py

from django.test import TestCase

from .models import Category, Person


class ManyToOneRecursiveTests(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.r = Category.objects.create(id=None, name="Root category", parent=None)
        cls.c = Category.objects.create(id=None, name="Child category", parent=cls.r)

    def test_m2o_recursive(self):
        self.assertSequenceEqual(self.r.child_set.all(), [self.c])
        self.assertEqual(self.r.child_set.get(name__startswith="Child").id, self.c.id)
        self.assertIsNone(self.r.parent)
        self.assertSequenceEqual(self.c.child_set.all(), [])
        self.assertEqual(self.c.parent.id, self.r.id)


class MultipleManyToOneRecursiveTests(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.dad = Person.objects.create(
            full_name="John Smith Senior", mother=None, father=None
        )
        cls.mom = Person.objects.create(
            full_name="Jane Smith", mother=None, father=None
        )
        cls.kid = Person.objects.create(
            full_name="John Smith Junior", mother=cls.mom, father=cls.dad
        )

    def test_m2o_recursive2(self):
        self.assertEqual(self.kid.mother.id, self.mom.id)
        self.assertEqual(self.kid.father.id, self.dad.id)
        self.assertSequenceEqual(self.dad.fathers_child_set.all(), [self.kid])
        self.assertSequenceEqual(self.mom.mothers_child_set.all(), [self.kid])
        self.assertSequenceEqual(self.kid.mothers_child_set.all(), [])
        self.assertSequenceEqual(self.kid.fathers_child_set.all(), [])