python-tdd/src/apps/dashboard/tests/test_models.py

from django.core.exceptions import ValidationError
from django.db.utils import IntegrityError
from django.test import TestCase
from ..models import Item, List

class ItemModelsTest(TestCase):
    def test_default_text(self):
        item = Item()
        self.assertEqual(item.text, "")
    
    def test_item_is_related_to_list(self):
        mylist = List.objects.create()
        item = Item()
        item.list = mylist
        item.save()
        self.assertIn(item, mylist.item_set.all())

    def test_cannot_save_null_list_items(self):
        mylist = List.objects.create()
        item = Item(list=mylist, text=None)
        with self.assertRaises(IntegrityError):
            item.save()

    def test_cannot_save_empty_list_items(self):
        mylist = List.objects.create()
        item = Item(list=mylist, text="")
        with self.assertRaises(ValidationError):
            item.full_clean()

    def test_duplicate_items_are_invalid(self):
        mylist = List.objects.create()
        Item.objects.create(list=mylist, text="jklol")
        with self.assertRaises(ValidationError):
            item = Item(list=mylist, text="jklol")
            item.full_clean()

    def test_still_can_save_same_item_to_different_lists(self):
        list1 = List.objects.create()
        list2 = List.objects.create()
        Item.objects.create(list=list1, text="nojk")
        item = Item(list=list2, text="nojk")
        item.full_clean() # should not raise

class ListModelTest(TestCase):
        def test_get_absolute_url(self):
            mylist = List.objects.create()
            self.assertEqual(mylist.get_absolute_url(), f"/apps/dashboard/{mylist.id}/")