Run Rust tests serially with #[serial] and #[file_serial] attributes.
npx skills add https://github.com/yankeeinlondon/rusty-biscuit --skill serial-test
Please help me install this Agent Skill. Skill: serial_test Source: https://github.com/yankeeinlondon/rusty-biscuit/tree/main/.claude/skills/serial_test Command: npx skills add https://github.com/yankeeinlondon/rusty-biscuit --skill serial-test
Test isolation for Rust tests that share global state (environment variables, files, singletons) to prevent flaky tests and ensure deterministic runs.
Annotate tests with #[serial] to run them one at a time within a single process, or use #[file_serial] for cross‑process isolation, then run cargo test as usual.
High-intent search queries and answers about installing and using this skill.
Isolating Rust tests that share global state requires serial test execution to prevent cross-test interference. Annotating tests with #[serial] runs them sequentially within a single process, ensuring deterministic builds and eliminating flaky test results caused by shared environment variables, files, or singletons.
Preventing cross-process interference during concurrent Rust test runs requires file-based locking. Using the optional file_locks feature with #[file_serial] provides cross-process isolation, ensuring deterministic execution when running tests across multiple processes or crates.
Serial test isolation works with both cargo test and nextest test runners. It integrates with existing test runners to provide isolated test execution, supporting both unit and integration tests across crates without requiring workflow changes for deterministic builds.
Grouping specific Rust tests for isolation while others run in parallel is supported through named groups. Using #[serial(group)] provides fine-grained isolation control, allowing distinct test groups to execute serially while ungrouped tests run concurrently.
File-based locking via #[file_serial] is necessary when tests run across multiple processes or crates that share files or environment variables. In-process #[serial] execution suffices for single-process isolation, preventing interference from shared singletons or variables.
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