Adds test for generated links in book model

bookwyrm/tests/models/test_book_model.py

@@ -1,5 +1,7 @@
 """ testing models """
 from dateutil.parser import parse
+
+from imagekit.models import ImageSpecField
 from django.test import TestCase
 from django.utils import timezone
 
@@ -26,11 +28,23 @@ class Book(TestCase):
 
     def test_remote_id(self):
         """fanciness with remote/origin ids"""
-        remote_id = "https://%s/book/%d" % (settings.DOMAIN, self.work.id)
+        remote_id = f"https://{settings.DOMAIN}/book/{self.work.id}"
         self.assertEqual(self.work.get_remote_id(), remote_id)
         self.assertEqual(self.work.remote_id, remote_id)
 
-    def test_create_book(self):
+    def test_generated_links(self):
+        """links produced from identifiers"""
+        book = models.Edition.objects.create(
+            title="ExEd",
+            parent_work=self.work,
+            openlibrary_key="OL123M",
+            inventaire_id="isbn:123",
+        )
+        self.assertEqual(book.openlibrary_link, "https://openlibrary.org/books/OL213M")
+        self.assertEqual(book.inventaire_link, "https://inventaire.io/entity/isbn:123")
+        self.assertIsInstance(book.cover_bw_book_xsmall_webp, ImageSpecField)
+
+    def test_create_book_invalid(self):
         """you shouldn't be able to create Books (only editions and works)"""
         self.assertRaises(ValueError, models.Book.objects.create, title="Invalid Book")