// toString() implementation may vary, just check it's not null and not empty
        assertFalse(stringRep.isEmpty());
    }

    @Test
    @DisplayName("Should generate correct associated data for AEAD")
    void testGetAssociatedData() {
        // Given
        transformHeader.setNonce(testNonce);
        transformHeader.setOriginalMessageSize(1024);
        transformHeader.setFlags(0x0001);