mirror of
https://github.com/notohh/rustlings.git
synced 2024-12-20 15:38:09 -05:00
37 lines
944 B
Rust
37 lines
944 B
Rust
fn generate_nametag_text(name: String) -> Result<String, String> {
|
|
// ^^^^^^ ^^^^^^
|
|
if name.is_empty() {
|
|
// `Err(String)` instead of `None`.
|
|
Err("Empty names aren't allowed".to_string())
|
|
} else {
|
|
// `Ok` instead of `Some`.
|
|
Ok(format!("Hi! My name is {name}"))
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
// You can optionally experiment here.
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn generates_nametag_text_for_a_nonempty_name() {
|
|
assert_eq!(
|
|
generate_nametag_text("Beyoncé".to_string()).as_deref(),
|
|
Ok("Hi! My name is Beyoncé"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn explains_why_generating_nametag_text_fails() {
|
|
assert_eq!(
|
|
generate_nametag_text(String::new())
|
|
.as_ref()
|
|
.map_err(|e| e.as_str()),
|
|
Err("Empty names aren't allowed"),
|
|
);
|
|
}
|
|
}
|