initial

tests/plugins/attachments/test_models.py

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+from wiki.plugins.attachments.models import Attachment
+from wiki.plugins.attachments.models import AttachmentRevision
+
+from tests.base import RequireRootArticleMixin
+from tests.base import TestBase
+
+
+class AttachmentRevisionTests(RequireRootArticleMixin, TestBase):
+    def setUp(self):
+        super().setUp()
+        self.attachment = Attachment.objects.create(
+            article=self.root_article,
+            original_filename="blah.txt",
+        )
+        self.revision = AttachmentRevision.objects.create(
+            attachment=self.attachment,
+            file=None,
+            description="muh",
+            revision_number=1,
+        )
+
+    def test_revision_no_file(self):
+        # Intentionally, there are no asserts, as the test just needs to
+        # target an if-branch in the pre-delete signal for AttachmentRevision
+        self.revision.delete()
+
+    def test_revision_file_size(self):
+        self.assertIsNone(self.revision.get_size())
+
+    def test_get_filename_no_file(self):
+        self.assertIsNone(self.revision.get_filename())
+
+    def test_str(self):
+        self.assertEqual(
+            str(self.revision),
+            "%s: %s (r%d)"
+            % (
+                "Root Article",
+                "blah.txt",
+                1,
+            ),
+        )