// Test constructor
    public void test_constructor() {
        ScoreUpdater updater = new ScoreUpdater();
        assertNotNull(updater);
    }

    // Test execute with empty list
    public void test_execute_emptyList() {
        String result = scoreUpdater.execute();
        assertEquals("", result);
    }

    // Test execute with single booster
    public void test_execute_singleBooster() {