rustlings/exercises/hashmaps/hashmaps2.rs

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// hashmaps2.rs
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// We're collecting different fruits to bake a delicious fruit cake.
// For this, we have a basket, which we'll represent in the form of a hash
// map. The key represents the name of each fruit we collect and the value
// represents how many of that particular fruit we have collected.
// Three types of fruits - Apple (4), Mango (2) and Lychee (5) are already
// in the basket hash map.
// You must add fruit to the basket so that there is at least
// one of each kind and more than 11 in total - we have a lot of mouths to feed.
// You are not allowed to insert any more of these fruits!
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//
// Make me pass the tests!
//
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// Execute `rustlings hint hashmaps2` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
use std::collections::HashMap;
#[derive(Hash, PartialEq, Eq)]
enum Fruit {
Apple,
Banana,
Mango,
Lychee,
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Pineapple,
}
fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
let fruit_kinds = vec![
Fruit::Apple,
Fruit::Banana,
Fruit::Mango,
Fruit::Lychee,
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Fruit::Pineapple,
];
for fruit in fruit_kinds {
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// TODO: Insert new fruits if they are not already present in the basket.
// Note that you are not allowed to put any type of fruit that's already
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// present!
}
}
#[cfg(test)]
mod tests {
use super::*;
// Don't modify this function!
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fn get_fruit_basket() -> HashMap<Fruit, u32> {
let mut basket = HashMap::<Fruit, u32>::new();
basket.insert(Fruit::Apple, 4);
basket.insert(Fruit::Mango, 2);
basket.insert(Fruit::Lychee, 5);
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basket
}
#[test]
fn test_given_fruits_are_not_modified() {
let mut basket = get_fruit_basket();
fruit_basket(&mut basket);
assert_eq!(*basket.get(&Fruit::Apple).unwrap(), 4);
assert_eq!(*basket.get(&Fruit::Mango).unwrap(), 2);
assert_eq!(*basket.get(&Fruit::Lychee).unwrap(), 5);
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}
#[test]
fn at_least_five_types_of_fruits() {
let mut basket = get_fruit_basket();
fruit_basket(&mut basket);
let count_fruit_kinds = basket.len();
assert!(count_fruit_kinds >= 5);
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}
#[test]
fn greater_than_eleven_fruits() {
let mut basket = get_fruit_basket();
fruit_basket(&mut basket);
let count = basket.values().sum::<u32>();
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assert!(count > 11);
}
#[test]
fn all_fruit_types_in_basket() {
let mut basket = get_fruit_basket();
fruit_basket(&mut basket);
for amount in basket.values() {
assert_ne!(amount, &0);
}
}
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}