main_test.rs

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

    #[test]
    fn test_greet() {
        assert_eq!(greet("Johnny"), "Hello, Johnny! You've been greeted from Rust!");
    }

    #[test]
    fn test_greet_badly() {
        assert_eq!(greet("Johnny"), "Hello, Bonny! You've been greeted from Rust!");
    }
}