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);
        pdis.readByte(); // position is 1