Prefer content over description for item bodies

tests/test_feed_validation.py

@@ -437,10 +437,60 @@ def test_feed_generation_normalizes_dates_urls_and_xml_shapes() -> None:
     assert "<" not in itunes_summary
     assert ">" not in itunes_summary
 
-    assert "contenteditable=" not in xml
-    assert "mode=" not in xml
-    assert "querystring=" not in xml
-    assert (
-        f"https://mirror.example/feeds/demo/images/{local_image_path(source_image)}"
-        in xml
+
+def test_item_body_uses_description_only_when_content_is_also_present() -> None:
+    xml, root = _serialize_feed(
+        feed_url="https://mirror.example",
+        feed_text="""<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0"
+     xmlns:content="http://purl.org/rss/1.0/modules/content/">
+  <channel>
+    <title>Demo Feed</title>
+    <link>https://source.example/feed</link>
+    <description>Demo description</description>
+    <item>
+      <title>Description Only</title>
+      <link>https://source.example/description-only</link>
+      <description><![CDATA[<p mode="summary">Description body</p>]]></description>
+      <guid isPermaLink="false">entry-description-only</guid>
+      <pubDate>Tue, 31 Mar 2026 10:31:50 +0000</pubDate>
+    </item>
+    <item>
+      <title>Content Only</title>
+      <link>https://source.example/content-only</link>
+      <guid isPermaLink="false">entry-content-only</guid>
+      <pubDate>Tue, 31 Mar 2026 10:31:50 +0000</pubDate>
+      <content:encoded><![CDATA[<div mode="body">Content body</div>]]></content:encoded>
+    </item>
+    <item>
+      <title>Both Present</title>
+      <link>https://source.example/both-present</link>
+      <description><![CDATA[<p mode="summary">Summary body</p>]]></description>
+      <guid isPermaLink="false">entry-both-present</guid>
+      <pubDate>Tue, 31 Mar 2026 10:31:50 +0000</pubDate>
+      <content:encoded><![CDATA[<div mode="body">Full body</div>]]></content:encoded>
+    </item>
+  </channel>
+</rss>
+""",
+    )
+
+    items = root.findall("./channel/item")
+    assert len(items) == 3
+
+    description_only, content_only, both_present = items
+
+    assert description_only.findtext("description") in (None, "")
+    assert description_only.findtext("content:encoded", namespaces=nsmap) == (
+        "<p>Description body</p>"
+    )
+
+    assert content_only.findtext("description") in (None, "")
+    assert content_only.findtext("content:encoded", namespaces=nsmap) == (
+        "<div>Content body</div>"
+    )
+
+    assert both_present.findtext("description") == "<p>Summary body</p>"
+    assert both_present.findtext("content:encoded", namespaces=nsmap) == (
+        "<div>Full body</div>"
     )