Add randomized fuzz test harness for cross-contract flows

[Baskarayelu]

Description

Add randomized fuzz harnesses for cross-contract flows to detect invariant violations in integrated operations.

Requirements and context

• Must be secure, tested, and documented
• Should be efficient and easy to review
• Randomize remittance amounts, schedule timing, and entity combinations

Suggested execution

• Fork the repo and create a branch
• git checkout -b test/integration-randomized-fuzz-harness
• Implement changes
• Write contract: integration_tests/tests/multi_contract_integration.rs
• Write comprehensive tests: integration_tests/tests/multi_contract_integration.rs
• Add documentation: integration_tests/README.md
• Include NatSpec-style comments
• Validate security assumptions

Test and commit

• Run tests: cargo test -p integration_tests
• Cover edge cases
• Include test output and security notes

Example commit message

test: add randomized fuzz harness for cross-contract flows

Guidelines

• Minimum 95 percent test coverage
• Clear documentation
• Timeframe: 96 hours

[Timothy2025-20]

@Timothy2025-20 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hey team, am a frontend developer with experience on tools like react, next and typescript. I would like to address this issue if given. Thanks

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Timothy2025-20 to this issue.

[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 200 Points.

🧑‍💻 Interested in contributing? Apply to work on this issue on Drips Wave, earn points, and receive rewards.

Warning

Only applications submitted via the apply link above will be considered. Please do not apply by commenting on the issue or opening a PR directly.

🤠 Repo maintainers: You can manage this issue's Points and Complexity on your Maintainer Dashboard here. Please keep an eye on applications and respond quickly 💙

ℹ️ Learn more about Drips Wave

[kimanicode]

@kimanicode has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I’d like to work on this issue because randomized fuzz testing is one of the best ways to uncover hidden invariant violations in complex cross-contract flows. For systems handling remittances and integrated contract operations, that kind of test coverage adds real security value beyond standard happy-path tests.

I have experience writing tests for stateful systems, edge cases, and failure scenarios, and I’m comfortable working on reliability-focused tasks that require careful reasoning rather than just straightforward feature work. I can build a clean fuzz harness for multi_contract_integration.rs, document the assumptions clearly, and make sure the tests are deterministic, useful, and easy to review.

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

[0xMegie]

can I work on this?

[TheDEV111]

@TheDEV111 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi Baskar, kindly assign me this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @TheDEV111 to this issue.

[Agbasimere]

@Agbasimere has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I'd love to work on this please.

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