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