How to use the networkml.parsers.pcap.pcap_utils.extract_macs function in networkml

def test_extract_macs():
    source, dest = extract_macs('123456789ABCDEF123456780')
    assert dest == '12:34:56:78:9a:bc'
    assert source == 'de:f1:23:45:67:80'
    source, dest = extract_macs('020406080A0C0E0103050700')
    assert dest == '02:04:06:08:0a:0c'
    assert source == '0e:01:03:05:07:00'

def test_extract_macs():
    source, dest = extract_macs('123456789ABCDEF123456780')
    assert dest == '12:34:56:78:9a:bc'
    assert source == 'de:f1:23:45:67:80'
    source, dest = extract_macs('020406080A0C0E0103050700')
    assert dest == '02:04:06:08:0a:0c'
    assert source == '0e:01:03:05:07:00'

num_sessions_rec = 0
    num_external_rec = 0
    num_tcp_sess_rec = 0
    num_udp_sess_rec = 0
    num_icmp_sess_rec = 0

    # Iterate over all sessions and aggregate the info
    other_ips = defaultdict(int)
    for key, session in session_dict.items():
        address_1, port_1 = get_ip_port(key[0])
        address_2, port_2 = get_ip_port(key[1])

        # Get the first packet and grab the macs from it
        first_packet = session[0][1]
        source_mac, destination_mac = extract_macs(first_packet)

        # If the source is the cpature source
        if (source_mac == capture_source
                or address_1 == capture_source):

            if is_private(address_2):
                other_ips[address_2] += 1

            num_sessions_init += 1
            num_external_init += is_external(address_1, address_2)
            num_tcp_sess_init += is_protocol(session, '06')
            num_udp_sess_init += is_protocol(session, '11')
            num_icmp_sess_init += is_protocol(session, '01')

            if int(port_1) < max_port:
                num_sport_init[int(port_1)] += 1