assertEquals("unexpected EOF reading netbios session header", exception.getMessage());
    }

    @Test
    @DisplayName("readPacketType with special stream returning -1 should return -1")
    void testReadPacketTypeSpecialStream() throws IOException {
        // Create a mock stream that returns exactly -1 on first read (special case)
        when(mockInputStream.read(any(byte[].class), anyInt(), anyInt())).thenReturn(-1); // Immediate EOF