rust-unsafe-env-mutation

Rust tests fail during parallel environment variable mutations because std::env::set_var causes process-wide data races. Serializing these mutations with a static Mutex guard prevents concurrent access and eliminates flaky CI results.

Serialize environment variable mutations across multiple test files by applying a single static Mutex<()> guard around all set_var and remove_var critical sections. This enforces cross-file safety and consistent test execution.

Ensure environment variables are restored after a test panic by wrapping env var mutations in a mutex lock that provides cleanup guarantees. This ensures the environment is safely restored even on panic paths.

Prevent data races with std::env::set_var in CI pipelines by serializing process-wide environment variable mutations with a static Mutex. This ensures tests running in parallel cannot concurrently mutate the same env vars.

A shared static Mutex works for env var cleanup across different Rust crates by serializing access to process-wide environment variable mutations. It ensures consistent state and cleanup guarantees across all test modules.