rust-testing
Codex-RS Contributors Rust Testing Best Practices
A comprehensive guide to writing high-quality Rust tests at the standard established by the top codex-rs contributors. This skill encodes patterns for test architecture, assertions, mock servers, test data, event-driven testing, determinism, snapshot testing, and integration test infrastructure.
When to Apply
- Writing new tests for any Rust module in codex-rs
- Adding regression tests for a bug fix (3-6 tests per PR)
- Creating integration tests that interact with the Responses API via SSE mocks
- Modifying TUI rendering code that requires snapshot coverage
- Reviewing test code for adherence to codebase conventions
Rule Categories by Priority
| Priority | Category | Prefix | Rules | Focus |
|---|---|---|---|---|
| CRITICAL | Test Architecture | arch- |
6 | File organization, imports, isolation |
| CRITICAL | Assertions | assert- |
5 | pretty_assertions, whole-object comparison |
| HIGH | Mock Servers | mock- |
6 | wiremock, SSE builders, ResponseMock |
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