added basic tests

internal/data/song_test.go

@@ -0,0 +1,34 @@
+package data
+
+import (
+	"testing"
+)
+
+func TestSong(t *testing.T) {
+	song := Song{
+		Name: "song_a",
+		Album: Album{
+			Name: "album_a",
+			Artists: []Artist{
+				{Name: "artist_a"},
+				{Name: "artist_a"},
+				{Name: "artist_b"},
+			},
+		},
+		Artists: []Artist{
+			{Name: "artist_a"},
+			{Name: "artist_a"},
+			{Name: "artist_b"},
+		},
+	}
+
+	compiled := song.Compile().(Song)
+
+	if len(compiled.Artists) != 2 {
+		t.Errorf(`the two artists with the same name have to be merged, %d`, len(compiled.Artists))
+	}
+
+	if len(compiled.Album.Artists) != 2 {
+		t.Errorf(`the two artists with the same names in the album have to be merged, %d`, len(compiled.Album.Artists))
+	}
+}