add features

backend/lyricsmanager_test.go

@@ -0,0 +1,22 @@
+package backend
+
+import (
+	"testing"
+
+	"github.com/dweymouth/supersonic/backend/mediaprovider"
+)
+
+func TestFetchLyricsAsyncWithNilTrack(t *testing.T) {
+	lm := &LyricsManager{}
+	called := false
+
+	lm.FetchLyricsAsync(nil, func(id string, lyrics *mediaprovider.Lyrics) {
+		called = true
+		if id != "" || lyrics != nil {
+			t.Fatalf("got callback values (%q, %v), want empty ID and nil lyrics", id, lyrics)
+		}
+	})
+	if !called {
+		t.Fatal("callback was not called")
+	}
+}