private PacDataInputStream createInputStream(byte[] data) throws IOException {
        return new PacDataInputStream(new ByteArrayInputStream(data));
    }

    @Test
    public void testAlign() throws IOException {
        // Test alignment from position 1 to 4
        byte[] data = new byte[] { 0x01, 0x02, 0x03, 0x04, 0x05 };
        PacDataInputStream pdis = createInputStream(data);

        ndrBuffer.advance(10);
        assertEquals(20, ndrBuffer.getIndex());
        assertEquals(20, ndrBuffer.getLength()); // Length should be updated
    }

    @Test
    void testAlign() {
        // Align to 4-byte boundary
        ndrBuffer.setIndex(1);
        int alignedBytes = ndrBuffer.align(4);
        assertEquals(3, alignedBytes); // Should advance by 3 bytes (1 -> 4)