String result = scoreUpdater.execute();
        assertEquals("", result);
    }

    // Test execute with single booster
    public void test_execute_singleBooster() {
        TestScoreBooster booster = new TestScoreBooster(100L);
        scoreUpdater.addScoreBooster(booster);

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

  }

  public void testInitialCapacity_large() {
    CacheBuilder.newBuilder().initialCapacity(Integer.MAX_VALUE);
    // that the builder didn't blow up is enough;
    // don't actually create this monster!
  }

  public void testConcurrencyLevel_zero() {
    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
    assertThrows(IllegalArgumentException.class, () -> builder.concurrencyLevel(0));
  }

  }

  public void testInitialCapacity_large() {
    CacheBuilder.newBuilder().initialCapacity(Integer.MAX_VALUE);
    // that the builder didn't blow up is enough;
    // don't actually create this monster!
  }

  public void testConcurrencyLevel_zero() {
    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
    assertThrows(IllegalArgumentException.class, () -> builder.concurrencyLevel(0));
  }