@Override
    public Optional<Decision> onBufferFinished(int numTotalUnSpillBuffers, int currentPoolSize) {
        return Optional.of(Decision.NO_ACTION);
    }
@Test
    void testOnBufferFinished() {
        Optional<Decision> finishedDecision = spillStrategy.onBufferFinished(5, 10);
        assertThat(finishedDecision).hasValue(Decision.NO_ACTION);
    }