% Testing
There is a new edition of the book and this is an old link.
> Rust includes support for writing software tests within the language itself.
```rust
#[cfg(test)]
mod tests {
#[test]
fn it_works() {
}
}
```
---
Here are the relevant sections in the new and old books:
* **[in the current edition: Ch 11.00 — Testing][2]**
* [In the first edition: Ch 4.2 — Testing][1]
[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/testing.html
[2]: ch11-00-testing.html