test(transport): add ipv6 tcp tests

[vladopajic]

vac:p2p:ift:2025q4-nimlibp2p-ipv6

• adding ipv6 tests for tcp
• overall cleanups of tcp specific tests

[github-actions]

🏁 Performance Summary

Commit: 65f63ae25809dec03da50d1b6251c597fdab5472

Scenario	Nodes	Total messages sent	Total messages received	Latency min (ms)	Latency max (ms)	Latency avg (ms)
✅ Base Test (QUIC)	10	100	900	0.571	4.365	1.720
✅ Base Test (TCP)	10	100	900	0.428	42.531	1.827

📊 View Container Resources in the Workflow Summary

Latency History

_{🔵 Min • 🟢 Avg • 🔴 Max}

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Loading

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Loading

[vladopajic]

open for better naming suggestions

[vladopajic]

going with this:

• nameMAStr if variable is multiaddress in string

• nameMA if variable parsed MultiAddress ( == MultiAddress.init(nameMAStr))

• namaTAStr if variable is transport address (ip) address in string

• nameTA if variable is parsed TransportAddress ( == initTAddress(namaTAStr) )

• all can end with IP4 or IP6 indicating version

[gmelodie]

Nit: capitalized names for consts maybe?

[vladopajic]

that should not be nit, if naming convention is to have capital lattes for consts that it should be mandatory change here. having that said, it doesn't seem that this is convention here.

[gmelodie]

This should be inline or template or, my favorite, not exist (just use TcpTransport.new(upgrade = Upgrade()) directly).

Also, why is Upgrade() not the default for TcpTransport.new? There might be a reason but for anyone reading this code it just looks unnecessary.

[vladopajic]

inline or template

this is just a test. and this kind of change here has neglectable impact. also tests in general don't have to have as performant code as possible unlike code in the library /libp2p/**.

why is Upgrade() not the default

qood question. it's required, but that decision is not introduced now, so we have to follow it here.

[gmelodie]

Why can't we have the tests listen on both ipv4 and ipv6 addresses? This way we'd only have one test and avoid this weird looking template

[vladopajic]

tests listen on both ipv4 and ipv6 addresses

not sure how you are thinking on implementing that. feel free to open pr with rough draft so we can see that approach.

this weird looking template

get used to that. this is how most tests are implemented in /tests/transports

[gmelodie]

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.10490% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.13%. Comparing base (b77f0bb) to head (65f63ae).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tests/transports/tcp_tests.nim	95.07%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1850      +/-   ##
==========================================
+ Coverage   87.07%   87.13%   +0.06%     
==========================================
  Files         275      276       +1     
  Lines       42886    43026     +140     
  Branches       14       14              
==========================================
+ Hits        37342    37492     +150     
+ Misses       5544     5534      -10     

Files with missing lines	Coverage Δ
tests/transports/testtcp.nim	100.00% <100.00%> (+4.26%)	⬆️
tests/transports/tcp_tests.nim	95.20% <95.07%> (ø)

... and 75 files with indirect coverage changes

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