(java.util.concurrent.ConcurrentLinkedQueue<SmbTransportImpl>) nonPooledField.get(pool);

        // Create spies
        SmbTransportImpl pooledSpy = spy(pooled);
        SmbTransportImpl nonPooledSpy = spy(nonPooled);

        // Replace with spies (remove and add back for concurrent queues)
        connections.remove(pooled);
        connections.offer(pooledSpy);

        decoded.decode(buf);
        assertEquals(123, decoded.value, "decoded value should equal original");
    }

    /**
     * Verify that encode invokes NdrBuffer.enc_ndr_short via a mocked
     * (spied) buffer.
     */
    @Test
    void encodeWithSpiedBufferCallsEncMethod() throws NdrException {
        NdrShort ns = new NdrShort(42);
        NdrBuffer spy = spy(new NdrBuffer(new byte[10], 0));