Implemented updateGameName() and tests for it

lib/data/dao/game_dao.dart

@@ -306,4 +306,17 @@ class GameDao extends DatabaseAccessor<AppDatabase> with _$GameDaoMixin {
     final result = await query.getSingleOrNull();
     return result != null;
   }
+
+  /// Changes the title of the game with the given [gameId] to [newName].
+  /// Returns `true` if more than 0 rows were affected, otherwise `false`.
+  Future<bool> updateGameName({
+    required String gameId,
+    required String newName,
+  }) async {
+    final query = update(gameTable)..where((g) => g.id.equals(gameId));
+    final rowsAffected = await query.write(
+      GameTableCompanion(name: Value(newName)),
+    );
+    return rowsAffected > 0;
+  }
 }

test/db_tests/game_test.dart

@@ -308,5 +308,23 @@ void main() {
 
       expect(removedWinner, null);
     });
+
+    test('Renaming a game works correctly', () async {
+      await database.gameDao.addGame(game: testGame1);
+
+      var fetchedGame = await database.gameDao.getGameById(
+        gameId: testGame1.id,
+      );
+      expect(fetchedGame.name, testGame1.name);
+
+      const newName = 'Updated Game Name';
+      await database.gameDao.updateGameName(
+        gameId: testGame1.id,
+        newName: newName,
+      );
+
+      fetchedGame = await database.gameDao.getGameById(gameId: testGame1.id);
+      expect(fetchedGame.name, newName);
+    });
   });
 }