feat: LetterFeed logo for feed

backend/app/tests/test_routers.py

@@ -182,6 +182,9 @@ def test_get_newsletter_feed(client: TestClient):
     root = ET.fromstring(response.text)
     # Atom feed uses a namespace, so we need to include it in our tag searches
     ns = {"atom": "http://www.w3.org/2005/Atom"}
+    logo = root.find("atom:logo", ns)
+    assert logo is not None
+    assert logo.text == "http://localhost:8000/logo.png"
     entry_titles = [
         entry.find("atom:title", ns).text for entry in root.findall("atom:entry", ns)
     ]