Backend Testing Skill

Use this skill for Rust test creation, failure analysis, and regression prevention.

Command rules

• Always run backend tests with worker cap: cargo test -j 4.
• Start with focused scope (single test/crate), then broaden.

Examples:

• cargo test test_name -j 4
• cargo test -p flequit-core -j 4
• cargo test -p flequit-infrastructure-sqlite -j 4

Workflow

1. Reproduce with the smallest failing scope.
2. Fix root cause (logic, mock, data setup, or async behavior).
3. Re-run the same focused test.
4. Run wider suite only after focused pass.

Test design

• Unit tests: isolate service/business logic.
• Integration tests: verify cross-layer behavior with realistic setup.
• Assert both success path and key failure path.