assertTrue(result.contains("TestScoreBooster : 200"));
        assertTrue(result.contains("TestScoreBooster : 300"));
    }

    // Test execute result format
    public void test_execute_resultFormat() {
        TestScoreBooster booster1 = new TestScoreBooster(123L);
        TestScoreBooster booster2 = new TestScoreBooster(456L);

        scoreUpdater.addScoreBooster(booster1);