assertTrue(lines[0].matches("TestScoreBooster : \\d+"));
        assertTrue(lines[1].matches("TestScoreBooster : \\d+"));
    }

    // Test with null pointer exception
    @Test
    public void test_execute_nullPointerException() {
        NullPointerScoreBooster booster = new NullPointerScoreBooster();
        scoreUpdater.addScoreBooster(booster);

        String result = scoreUpdater.execute();