verify(mockInputStream, times(3)).read(any(byte[].class), anyInt(), anyInt());
    }

    @Test
    @DisplayName("readPacketType should read header and return packet type")
    void testReadPacketType() throws IOException {
        byte[] headerData = { (byte) 0x81, (byte) 0x00, (byte) 0x00, (byte) 0x44 };
        ByteArrayInputStream bais = new ByteArrayInputStream(headerData);
        byte[] buffer = new byte[10];