feat: added UI

crochet/tests/test_models.py

@@ -1,5 +1,6 @@
 import io
 
+from django.contrib.auth.models import User
 from django.core.files.uploadedfile import SimpleUploadedFile
 from django.test import TestCase
 from PIL import Image
@@ -32,6 +33,21 @@ class PatternModelTests(TestCase):
         second = Pattern.objects.create()
         self.assertNotEqual(first.uuid, second.uuid)
 
+    def test_created_by_defaults_to_none(self):
+        pattern = Pattern.objects.create()
+        self.assertIsNone(pattern.created_by)
+
+    def test_created_by_survives_owner_deletion(self):
+        # SET_NULL (no CASCADE): borrar la cuenta no debe llevarse por delante
+        # el patrón, solo desasociarlo.
+        owner = User.objects.create_user(username='crocheter', password='s3cret-pw')
+        pattern = Pattern.objects.create(created_by=owner)
+
+        owner.delete()
+        pattern.refresh_from_db()
+
+        self.assertIsNone(pattern.created_by)
+
 
 class PatternImageModelTests(TestCase):
     def test_deleted_with_pattern(self):