}

    // Edge: releasing null must be a no-op without exceptions
    @Test
    @DisplayName("releaseBuffer(null) is a no-op and does not throw")
    void releaseNullIsNoop() {
        BufferCacheImpl impl = new BufferCacheImpl(1, 4);
        assertDoesNotThrow(() -> impl.releaseBuffer(null));
        // Subsequent get should still work
        assertEquals(4, impl.getBuffer().length);