}
    }

    /**
     * Test that getPreauthIntegrityHash returns a defensive copy
     */
    @Test
    @DisplayName("getPreauthIntegrityHash should return defensive copy")
    void testGetPreauthHashDefensiveCopy() throws Exception {
        byte[] hash = transport.getPreauthIntegrityHash();
        assertNotNull(hash);

        // Modify returned hash
        if (hash.length > 0) {