Complete open my2dos tasks

core/tests.py

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+from django.contrib.auth import get_user_model
+from django.test import TestCase
+from django.urls import reverse
+
+from .models import Item, Tag, UserPreference
+from .views import parse_quick_content
+
+
+class ItemMetadataTests(TestCase):
+    def setUp(self):
+        self.user = get_user_model().objects.create_user(username='tester', password='secret')
+
+    def test_code_sections_are_ignored_when_extracting_tags(self):
+        item = Item.objects.create(
+            owner=self.user,
+            content='Outside #real\n```python\n# fenced\n```\nInline `#inline` text',
+        )
+        item.sync_metadata()
+        self.assertEqual(list(item.tags.values_list('name', flat=True)), ['real'])
+        self.assertFalse(Tag.objects.filter(name__in=['fenced', 'inline']).exists())
+
+    def test_unused_tags_are_removed_after_sync_and_delete(self):
+        item = Item.objects.create(owner=self.user, content='#old')
+        item.sync_metadata()
+        item.content = '#new'
+        item.save()
+        item.sync_metadata()
+        self.assertFalse(Tag.objects.filter(name='old').exists())
+        self.assertTrue(Tag.objects.filter(name='new').exists())
+
+        item.delete()
+        self.assertFalse(Tag.objects.filter(name='new').exists())
+
+
+class DefaultItemKindTests(TestCase):
+    def setUp(self):
+        self.user = get_user_model().objects.create_user(username='tester', password='secret')
+        self.client.force_login(self.user)
+        self.preferences = UserPreference.objects.create(user=self.user, default_item_kind=Item.Kind.TODO)
+
+    def test_quick_create_uses_user_default(self):
+        response = self.client.post(reverse('index'), {'content': 'Default task'})
+        self.assertRedirects(response, reverse('index'))
+        self.assertEqual(Item.objects.get().kind, Item.Kind.TODO)
+
+    def test_explicit_command_overrides_default(self):
+        kind, _, content, _ = parse_quick_content('/note Explicit note', Item.Kind.TODO)
+        self.assertEqual(kind, Item.Kind.NOTE)
+        self.assertEqual(content, 'Explicit note')
+
+    def test_new_item_editor_uses_user_default(self):
+        response = self.client.get(reverse('new_item'))
+        self.assertEqual(response.context['requested_kind'], Item.Kind.TODO)
+
+
+class CopyButtonTests(TestCase):
+    def test_item_has_copy_button_with_original_text(self):
+        user = get_user_model().objects.create_user(username='tester', password='secret')
+        item = Item.objects.create(owner=user, content='Text to copy')
+        self.client.force_login(user)
+        response = self.client.get(reverse('item_detail', args=[item.pk]))
+        self.assertContains(response, 'class="copy-item')
+        self.assertContains(response, 'Text to copy')