verify(messageBlock).setMid(expectedMid);
        verify(messageBlock).getMid();
    }

    @Test
    @DisplayName("Test setMid with boundary values")
    void testSetMidWithBoundaryValues() {
        // Test with MAX_VALUE
        long maxMid = Long.MAX_VALUE;
        doNothing().when(messageBlock).setMid(maxMid);
        when(messageBlock.getMid()).thenReturn(maxMid);