test(vm): add comprehensive unit tests for bytecode argument encoding and decoding (#4240)

[ParthMozarkar]

Summary

This PR adds comprehensive unit tests for bytecode argument encoding and decoding in:

core/engine/src/vm/opcode/args.rs

as requested in issue #4240.

What’s Included

• ✅ Tests verifying correct encoding and decoding of opcode arguments.
• ✅ Round-trip validation (encode → decode → assert equality).
• ✅ Boundary condition tests for edge-case values.
• ✅ Out-of-bounds read tests to ensure panics occur as expected.
• ✅ Negative test cases validating safety guarantees.

Motivation

Bytecode argument handling is a critical component of the VM execution pipeline.
These tests strengthen confidence in argument parsing correctness and protect against silent corruption or unsafe memory access.

By covering both valid and invalid cases, this improves robustness and makes future refactors safer.

Verification

• cargo test passes successfully.
• No Clippy warnings introduced.
• Formatting verified with cargo fmt.

Closes #4240

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	49,935	49,935	0
Ignored	2,207	2,207	0
Failed	821	821	0
Panics	0	0	0
Conformance	94.28%	94.28%	0.00%

Tested main commit: 5acb570038007c606d75b17bed6ee9a02117ce97
Tested PR commit: adabe45a971eb2e48bf9b96ec350ffbd54d8c465
Compare commits: 5acb570...adabe45

[Sharktheone]

I think you should base this off main and not off your own branch with console.table implemented

[ParthMozarkar]

Thanks for pointing that out you're right.

I’ve rebased the branch on top of main and force pushed the updated changes so the PR now only contains the unit test additions for #4240.

Please let me know if anything else needs adjustment. 🙌

[ParthMozarkar]

@jedel1043
everything is perfect i feel like so if you could please review it for merging...it would be great !!

[jedel1043]

Thanks, looks great!

[jedel1043]

You might need to merge pull the main branch btw

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.17%. Comparing base (6ddc2b4) to head (973ec58).
⚠️ Report is 841 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4735       +/-   ##
===========================================
+ Coverage   47.24%   59.17%   +11.93%     
===========================================
  Files         476      563       +87     
  Lines       46892    62363    +15471     
===========================================
+ Hits        22154    36905    +14751     
- Misses      24738    25458      +720     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[ParthMozarkar]

You might need to merge pull the main branch btw

Hey,
thanks for the suggestion...i have merged into the main branch so pleease review it !!

[ParthMozarkar]

Hey, could you just approve the last 3 workflows awaiting so we can then merge this pr and work upon another?

[jedel1043]

Where are all the tests? You deleted them or something

[ParthMozarkar]

Where are all the tests? You deleted them or something

so sorry i somehow replaced it or something....but now i have fixed everything....the errors of CI and also brought back the tests