Testing: Mutation testing for contracts and critical backend logic

[joelpeace48-cell]

Context

High line coverage doesn't prove the tests catch real bugs. Mutation testing measures whether tests
fail when logic is perturbed.

Scope

• Run a mutation tool (cargo-mutants for Rust; Stryker for JS) on financial/auth-critical modules.
• Set a mutation-score threshold for those modules; add tests to kill survivors.

Acceptance criteria

• Critical modules meet a defined mutation score; surviving mutants are triaged.

Verification

• CI reports mutation score; threshold gate enforced on critical paths.

[jesutobaadedejidev]

I would like to work on this. Do assign it to me.

[gloskull]

Hello, I have 4 years of experience delivering solutions for projects like this, covering backend, frontend, and smart contract development. After carefully reviewing your requirements, I have a clear understanding of the task and am confident in my ability to deliver a clean, efficient, and thoroughly tested solution on time. I prioritize code quality, maintainability, and industry best practices throughout the development process. My PR will be submitted in under 10hours.