Use setUpTestData() to speed up tests

Pylint's `bad-classmethod-argument` is disabled for each definition
to avoid rewriting the method bodies just to rename `self` → `cls`.
This can be done gradually, as the setUpTestData methods are modified
along the way.

bookwyrm/tests/views/books/test_links.py

@@ -15,10 +15,9 @@ from bookwyrm.tests.validate_html import validate_html
 class LinkViews(TestCase):
     """books books books"""
 
-    # pylint: disable=invalid-name
-    def setUp(self):
+    @classmethod
+    def setUpTestData(self):  # pylint: disable=bad-classmethod-argument
         """we need basic test data and mocks"""
-        self.factory = RequestFactory()
         with patch("bookwyrm.suggested_users.rerank_suggestions_task.delay"), patch(
             "bookwyrm.activitystreams.populate_stream_task.delay"
         ):
@@ -49,6 +48,10 @@ class LinkViews(TestCase):
 
         models.SiteSettings.objects.create()
 
+    def setUp(self):
+        """individual test setup"""
+        self.factory = RequestFactory()
+
     def test_add_link_page(self):
         """there are so many views, this just makes sure it LOADS"""
         view = views.AddFileLink.as_view()