RdmaMemoryRegion region = bufferManager.getSendRegion(1024);
        assertNotNull(region);

        // Release should not throw exception
        assertDoesNotThrow(() -> bufferManager.releaseSendRegion(region));
    }

    @Test
    public void testGetReceiveRegion() throws Exception {
        RdmaMemoryRegion region = bufferManager.getReceiveRegion();

            // Parse response
            ServerMessageBlock2 response = parseResponse(responseBuffer);
            request.setResponse(response);
            
        } finally {
            bufferManager.releaseSendRegion(sendRegion);
        }
    }
    
    private void waitForSendCredit() throws IOException {
        long deadline = System.currentTimeMillis() + 5000;  // 5 second timeout
        

            assertTrue(initialActive >= 2, "Should have at least 2 active regions");

            // Test buffer release and reuse
            bufferManager.releaseSendRegion(sendRegion);
            bufferManager.releaseReceiveRegion(recvRegion);

            // Allocate again to test pooling
            RdmaMemoryRegion newSendRegion = bufferManager.getSendRegion(4096);

        return region;
    }

    /**
     * Release a send region back to the pool
     *
     * @param region memory region to release
     */
    public void releaseSendRegion(RdmaMemoryRegion region) {
        if (region.getSize() == sendBufferSize && availableSendRegions.size() < initialSendBuffers * 2) {
            availableSendRegions.offer(region);
        } else {