rustlings/exercises/07_structs/structs3.rs

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// Structs contain data, but can also have logic. In this exercise we have
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// defined the `Package` struct and we want to test some logic attached to it.
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#[derive(Debug)]
struct Package {
sender_country: String,
recipient_country: String,
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weight_in_grams: u32,
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}
impl Package {
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fn new(sender_country: String, recipient_country: String, weight_in_grams: u32) -> Self {
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if weight_in_grams < 10 {
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// This isn't how you should handle errors in Rust, but we will
// learn about error handling later.
panic!("Can't ship a package with weight below 10 grams");
}
Self {
sender_country,
recipient_country,
weight_in_grams,
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}
}
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// TODO: Add the correct return type to the function signature.
fn is_international(&self) {
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// TODO: Read the tests that use this method to find out when a package
// is considered international.
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}
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// TODO: Add the correct return type to the function signature.
fn get_fees(&self, cents_per_gram: u32) {
// TODO: Calculate the package's fees.
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}
}
fn main() {
// You can optionally experiment here.
}
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#[cfg(test)]
mod tests {
use super::*;
#[test]
#[should_panic]
fn fail_creating_weightless_package() {
let sender_country = String::from("Spain");
let recipient_country = String::from("Austria");
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Package::new(sender_country, recipient_country, 5);
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}
#[test]
fn create_international_package() {
let sender_country = String::from("Spain");
let recipient_country = String::from("Russia");
let package = Package::new(sender_country, recipient_country, 1200);
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assert!(package.is_international());
}
#[test]
fn create_local_package() {
let sender_country = String::from("Canada");
let recipient_country = sender_country.clone();
let package = Package::new(sender_country, recipient_country, 1200);
assert!(!package.is_international());
}
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#[test]
fn calculate_transport_fees() {
let sender_country = String::from("Spain");
let recipient_country = String::from("Spain");
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let cents_per_gram = 3;
let package = Package::new(sender_country, recipient_country, 1500);
assert_eq!(package.get_fees(cents_per_gram), 4500);
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assert_eq!(package.get_fees(cents_per_gram * 2), 9000);
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}
}