Write E2E test: governance proposal lifecycle

[Nursca]

Description
Governance must be verified end-to-end: creating a proposal, voting, waiting for the timelock, executing, and verifying the parameter change takes effect in the main contract.

Requirements and context

• Create a governance proposal to change MIN_INVOICE_AMOUNT
• Cast votes to pass quorum
• Wait for the voting period to close (use ledger fast-forward if available on local node)
• Execute the proposal after timelock
• Verify the main contract uses the new MIN_INVOICE_AMOUNT by submitting a below-threshold invoice and confirming rejection

Suggested execution

git checkout -b test/e2e-governance

• Create tests/e2e/governance.test.ts
• Implement ledger fast-forward helper if local node supports it
• Write proposal lifecycle and parameter verification tests

Example commit message
test(e2e): add governance proposal lifecycle E2E tests

[rindicomfort]

@rindicomfort has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello Maintainer,

Please I’d love to take this issue on. I’m a smart contract and full-stack developer with experience across OnlyDust, Drips Waves

My stack includes Rust, Soroban, Cairo, Solidity, and TypeScript. I can deliver a clean, tested, and well-documented solution within 24 hours of assignment.

Happy to start immediately. Thank yOU

ℹ️ Repo Maintainers: To accept this application, review their application or assign @rindicomfort to this issue.

[sadiqabubakar826-del]

@sadiqabubakar826-del has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer Let me work on this issue
I'll definitely give you quick response

ℹ️ Repo Maintainers: To accept this application, review their application or assign @sadiqabubakar826-del to this issue.

[distributed-nerd]

@distributed-nerd has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

can i work on this

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[drips-wave]

Congratulations, @distributed-nerd! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @distributed-nerd: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

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[grantfox-oss]

🦊 GrantFox — @distributed-nerd has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #282)
2. Your PR will be reviewed by the Invoice-Liquidity-Network maintainers

Good luck! Track your progress on GrantFox.