1  pub fn greeting(name: &str) -> String {
 2      //format!("Hello {name}!")
 3      format!("Hello!")
 4  }
 5  
 6  #[cfg(test)]
 7  mod tests {
 8      use super::*;
 9  
10      #[test]
11      fn greeting_contains_name() {
12          let result = greeting("Carol");
13          assert!(
14              result.contains("Carol"),
15              "Greeting did not contain name, value was `{result}`"
16          );
17      }
18  }