| 1 | //! Greetings. |
| 2 | |
| 3 | /// The greeting for `name`. |
| 4 | pub fn greeting(name: &str) -> String { |
| 5 | let trimmed = name.trim(); |
| 6 | let display_name = if trimmed.is_empty() { "world" } else { trimmed }; |
| 7 | format!("Hello, {display_name}!") |
| 8 | } |
| 9 | |
| 10 | #[cfg(test)] |
| 11 | mod tests { |
| 12 | use super::*; |
| 13 | |
| 14 | #[test] |
| 15 | fn greets_by_name() { |
| 16 | assert_eq!(greeting("Ada"), "Hello, Ada!"); |
| 17 | } |
| 18 | |
| 19 | #[test] |
| 20 | fn greets_world_with_empty_string() { |
| 21 | assert_eq!(greeting(""), "Hello, world!"); |
| 22 | } |
| 23 | |
| 24 | #[test] |
| 25 | fn greets_world_with_whitespace_only() { |
| 26 | assert_eq!(greeting(" "), "Hello, world!"); |
| 27 | } |
| 28 | |
| 29 | #[test] |
| 30 | fn trims_whitespace_from_name() { |
| 31 | assert_eq!(greeting(" Ada "), "Hello, Ada!"); |
| 32 | } |
| 33 | } |