// Then
        assertEquals(testSessionId, transformHeader.getSessionId());
    }

    @Test
    @DisplayName("Should encode transform header to byte buffer")
    void testEncodeToBuffer() {
        // Given
        // Note: Protocol ID is not set on transform header - it's part of the encrypted message
        transformHeader.setNonce(testNonce);
        transformHeader.setOriginalMessageSize(1024);