Add paddock briefing RSS backend spike

internal/news/news_test.go

@@ -0,0 +1,72 @@
+package news
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestParseRSSDeduplicatesByURL(t *testing.T) {
+	fixture := `<?xml version="1.0"?>
+<rss version="2.0">
+  <channel>
+    <item>
+      <title>First story</title>
+      <link>https://example.com/f1/story?utm_source=rss</link>
+      <pubDate>Mon, 25 May 2026 10:00:00 GMT</pubDate>
+      <description>Latest from the paddock</description>
+      <category>Formula 1</category>
+    </item>
+    <item>
+      <title>Duplicate story newer</title>
+      <link>https://example.com/f1/story</link>
+      <pubDate>Mon, 25 May 2026 11:00:00 GMT</pubDate>
+      <description>Updated headline</description>
+    </item>
+  </channel>
+</rss>`
+	source := Source{ID: "example", Category: "news"}
+	items, err := Parse(source, strings.NewReader(fixture), time.Unix(100, 0).UTC())
+	if err != nil {
+		t.Fatalf("Parse() error = %v", err)
+	}
+	if len(items) != 1 {
+		t.Fatalf("items len = %d, want 1", len(items))
+	}
+	if items[0].Title != "Duplicate story newer" {
+		t.Fatalf("title = %q, want newer duplicate", items[0].Title)
+	}
+	if items[0].URL != "https://example.com/f1/story" {
+		t.Fatalf("url = %q, want canonical URL", items[0].URL)
+	}
+	if items[0].PublishedAt.IsZero() {
+		t.Fatal("PublishedAt was not parsed")
+	}
+}
+
+func TestParseAtom(t *testing.T) {
+	fixture := `<?xml version="1.0" encoding="UTF-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+  <entry>
+    <title>Formula 1 video</title>
+    <link rel="alternate" href="https://www.youtube.com/watch?v=abc123"/>
+    <published>2026-05-25T12:30:00Z</published>
+    <summary>Highlights from the weekend</summary>
+    <category term="video"/>
+  </entry>
+</feed>`
+	source := Source{ID: "f1-youtube", Category: "video"}
+	items, err := Parse(source, strings.NewReader(fixture), time.Unix(200, 0).UTC())
+	if err != nil {
+		t.Fatalf("Parse() error = %v", err)
+	}
+	if len(items) != 1 {
+		t.Fatalf("items len = %d, want 1", len(items))
+	}
+	if items[0].Source != "f1-youtube" || items[0].Category != "video" {
+		t.Fatalf("item = %+v, want source/category preserved", items[0])
+	}
+	if items[0].URL != "https://www.youtube.com/watch?v=abc123" {
+		t.Fatalf("url = %q, want alternate link", items[0].URL)
+	}
+}