Testing

12 pages in this section.

The mental model behind Rust's built-in test harness: how #[cfg(test)] modules, the tests/ directory, and doctests each answer a different question about correctness.

Explainer Rust Testing Test Harness

Testing Basics

`#[test]`, assertions, and `cargo test`.

Rust Testing Basics Cargo Test

Unit vs Integration Tests

In-module tests and the `tests/` directory.

Rust Testing Unit Integration

Doctests

Executable documentation examples.

Rust Testing Doctest Documentation

Test Organization

Fixtures, helpers, and shared setup.

Rust Testing Organization Fixtures

Mocking & Test Doubles

`mockall` and trait-based seams.

Rust Testing Mocking Mockall

Property-Based Testing

Rust Testing Proptest Property

Snapshot Testing

`insta` for output regression.

Rust Testing Insta Snapshot

Benchmarking with Criterion

Rust Testing Criterion Benchmark

Testing Async Code

Rust Testing Async Tokio

Coverage & CI

`cargo-llvm-cov` and gating on quality.

Rust Testing Coverage CI

Testing Best Practices

Fast, deterministic, meaningful tests.

Rust Testing Best Practices List

Testing

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Testing