String result = scoreUpdater.execute();
        assertTrue(result.contains("TestScoreBooster : 100"));
    }

    // Test execute with multiple boosters
    public void test_execute_multipleBoosters() {
        TestScoreBooster booster1 = new TestScoreBooster(100L);
        TestScoreBooster booster2 = new TestScoreBooster(200L);

        scoreUpdater.addScoreBooster(booster1);