comments added in new game constructor (#97)

Co-authored-by: Logan Spears <logan@logans-mac-mini.lan>

game.go

@@ -378,6 +378,7 @@ func (g *Game) copy(game *Game) {
 	g.pos = game.pos
 	g.outcome = game.outcome
 	g.method = game.method
+	g.comments = game.Comments()
 }
 
 func (g *Game) Clone() *Game {

pgn_test.go

@@ -106,6 +106,20 @@ func TestCommentsDetection(t *testing.T) {
 	}
 }
 
+func TestNewGameComments(t *testing.T) {
+	for _, test := range commentTests {
+		pgn, err := PGN(strings.NewReader(test.PGN))
+		if err != nil {
+			t.Fatal(err)
+		}
+		game := NewGame(pgn)
+		comment := strings.Join(game.Comments()[test.MoveNumber], " ")
+		if comment != test.CommentText {
+			t.Fatalf("expected pgn comment to be %s but got %s", test.CommentText, comment)
+		}
+	}
+}
+
 func TestWriteComments(t *testing.T) {
 	pgn := mustParsePGN("fixtures/pgns/0005.pgn")
 	game, err := decodePGN(pgn)