trpl-zh-cn/listings/ch11-writing-automated-tests/no-listing-07-custom-failure-message/src/lib.rs

pub fn greeting(name: &str) -> String {
    String::from("Hello!")
}

#[cfg(test)]
mod tests {
    use super::*;

    // ANCHOR: here
    #[test]
    fn greeting_contains_name() {
        let result = greeting("Carol");
        assert!(
            result.contains("Carol"),
            "Greeting did not contain name, value was `{}`",
            result
        );
    }
    // ANCHOR_END: here
}