refactor: move inline tests to separate files via #[path]

crates/adapters/rss/src/tests/lib.rs

@@ -0,0 +1,15 @@
+use super::*;
+
+#[test]
+fn render_feed_uses_provided_title() {
+    let adapter = RssAdapter::new("http://example.com".into());
+    let xml = adapter.render_feed(&[], "Custom Title").unwrap();
+    assert!(xml.contains("<title>Custom Title</title>"));
+}
+
+#[test]
+fn render_feed_empty_entries_produces_valid_xml() {
+    let adapter = RssAdapter::new("http://example.com".into());
+    let xml = adapter.render_feed(&[], "My Feed").unwrap();
+    assert!(xml.starts_with("<?xml") || xml.starts_with("<rss"));
+}