rustlings/solutions/17_tests/tests3.rs

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struct Rectangle {
width: i32,
height: i32,
}
impl Rectangle {
// Don't change this function.
fn new(width: i32, height: i32) -> Self {
if width <= 0 || height <= 0 {
// Returning a `Result` would be better here. But we want to learn
// how to test functions that can panic.
panic!("Rectangle width and height can't be negative");
}
Rectangle { width, height }
}
}
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn correct_width_and_height() {
let rect = Rectangle::new(10, 20);
assert_eq!(rect.width, 10); // Check width
assert_eq!(rect.height, 20); // Check height
}
#[test]
#[should_panic] // Added this attribute to check that the test panics.
fn negative_width() {
let _rect = Rectangle::new(-10, 10);
}
#[test]
#[should_panic] // Added this attribute to check that the test panics.
fn negative_height() {
let _rect = Rectangle::new(10, -10);
}
}