diff --git a/kifu/core/src/database.rs b/kifu/core/src/database.rs
index bbc6a35..7e9995f 100644
--- a/kifu/core/src/database.rs
+++ b/kifu/core/src/database.rs
@@ -83,7 +83,6 @@ mod test {
         let db =
             Database::open_path(PathBuf::from("fixtures/five_games/")).expect("database to open");
         assert_eq!(db.all_games().count(), 5);
-        for game in db.all_games() {}
 
         assert_matches!(db.all_games().find(|g| g.info.black_player == Some("Steve".to_owned())),
         Some(game) => {
diff --git a/kifu/core/src/types.rs b/kifu/core/src/types.rs
index 00850f4..86c00d9 100644
--- a/kifu/core/src/types.rs
+++ b/kifu/core/src/types.rs
@@ -185,7 +185,7 @@ mod test {
 
     #[test]
     fn current_player_changes_after_move() {
-        let mut state = GameState::new();
+        let mut state = GameState::default();
         assert_eq!(state.current_player, Color::Black);
         state.place_stone(Coordinate { column: 9, row: 9 }).unwrap();
         assert_eq!(state.current_player, Color::White);
@@ -193,7 +193,7 @@ mod test {
 
     #[test]
     fn current_player_remains_the_same_after_self_capture() {
-        let mut state = GameState::new();
+        let mut state = GameState::default();
         state.board = Board::from_coordinates(
             vec![
                 (Coordinate { column: 17, row: 0 }, Color::White),
@@ -214,7 +214,7 @@ mod test {
 
     #[test]
     fn ko_rules_are_enforced() {
-        let mut state = GameState::new();
+        let mut state = GameState::default();
         state.board = Board::from_coordinates(
             vec![
                 (Coordinate { column: 7, row: 9 }, Color::White),