Rust Testing

Rust has first-class support for automated testing within the language and its tooling.

Types of Tests

1. Unit Tests: Focused on individual modules. They typically reside in the same file as the code they test, within a cfg(test) module.
2. Integration Tests: External to the library, stored in a tests/ directory. They test the public API of the crate.

The #[test] Attribute

Annotating a function with #[test] tells the test runner to execute it.

• Assertions: Use assert!, assert_eq!, and assert_ne!.
• Custom Messages: Pass a format string as an additional argument to assertions.
• Panic Testing: Use #[should_panic] to verify that code fails as expected.

Execution

Run all tests using cargo test.

References

• Source: 00_Raw/the-rust-programming-language.md
• rust-moc
• rust-cargo