fix: harden explore dataset collection

backend/internal/logic/dataset/feed_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"net/url"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -98,6 +99,29 @@ func TestValidateFeedURLRejectsLocalAddressesAndCredentials(t *testing.T) {
 	require.NoError(t, validateFeedURL(parsed))
 }
 
+func TestLiveFeedCollectionFormats(t *testing.T) {
+	if os.Getenv("TEST_LIVE_FEEDS") != "1" {
+		t.Skip("set TEST_LIVE_FEEDS=1 to verify external feeds")
+	}
+	fetcher := NewHTTPFeedFetcher()
+	for _, test := range []struct {
+		name       string
+		url        string
+		wantFormat string
+	}{
+		{name: "JSON Feed", url: "https://bbg.buzzing.cc/feed.json", wantFormat: "json_feed"},
+		{name: "RSS XML", url: "https://rsshub.ktachibana.party/cls/hot", wantFormat: "rss"},
+		{name: "second RSS XML", url: "https://rsshub.ktachibana.party/jin10", wantFormat: "rss"},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			feed, err := fetcher.Fetch(context.Background(), test.url)
+			require.NoError(t, err)
+			require.Equal(t, test.wantFormat, feed.Format)
+			require.NotEmpty(t, feed.Items)
+		})
+	}
+}
+
 func TestSyncSourcesRecordsFeedFailure(t *testing.T) {
 	database := newDatasetTestDatabase(t)
 	user := createDatasetTestUser(t, database, "feed-owner@example.com")