Added TEST for Packet parsing

[kYroL01]

• cargo test

running 4 tests
test tests::test_parse_ipv6_udp_packet ... ok
test tests::test_parse_ipv4_tcp_packet ... ok
test tests::test_parse_small_packet ... ok
test tests::test_parse_unknown_protocol ... ok

test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

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