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+// TODO: This function refuses to generate text to be printed on a nametag if
+// you pass it an empty string. It'd be nicer if it explained what the problem
+// was instead of just returning `None`. Thankfully, Rust has a similar
+// construct to `Option` that can be used to express error conditions. Change
+// the function signature and body to return `Result<String, String>` instead
+// of `Option<String>`.
+fn generate_nametag_text(name: String) -> Result<String, String> {
+ if name.is_empty() {
+ Err(String::from("Empty names aren't allowed"))
+ } else {
+ 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"),
+ );
+ }
+}