// Then
        verify(messageBlock).setExtendedSecurity(false);
    }

    @Test
    @DisplayName("Test setSessionId method")
    void testSetSessionId() {
        // Given
        long sessionId = 987654321L;
        doNothing().when(messageBlock).setSessionId(sessionId);

        // When
        messageBlock.setSessionId(sessionId);

        void testSetRequestCredits() {
            testBlock.setRequestCredits(10);
        }

        @Test
        @DisplayName("Test set session ID")
        void testSetSessionId() {
            testBlock.setSessionId(123456L);
        }
    }

    @Nested
    @DisplayName("String Handling Tests")
    class StringHandlingTests {

        @BeforeEach