String result = scoreUpdater.execute();
        assertTrue(result.contains("Runtime exception message"));
    }

    // Test large number of boosters
    public void test_execute_manyBoosters() {
        for (int i = 0; i < 100; i++) {
            TestScoreBooster booster = new TestScoreBooster(i);
            scoreUpdater.addScoreBooster(booster);
        }