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// hashmap2.rs
// 给你一个用散列表表示的水果篮,它的键表示水果的名称,值表示篮子里对应水果的个数。
// 现在需要往篮子添加至少 11 种水果。篮子里已有 - 苹果 (4),
// 芒果 (2) 和荔枝 (5) 三种水果,你不能再添加这些水果。
//
// 让我通过测试!
//
// 如果需要提示,可以执行命令 `rustlings hint hashmap2`。
// I AM NOT DONE
use std::collections::HashMap;
#[derive(Hash, PartialEq, Eq)]
enum Fruit {
Apple,
Banana,
Mango,
Lychee,
Pineapple,
}
fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
let fruit_kinds = vec![
Fruit::Apple,
Fruit::Banana,
Fruit::Mango,
Fruit::Lychee,
Fruit::Pineapple,
];
for fruit in fruit_kinds {
// TODO如果篮子里没有某种水果就把它放入篮子。
// 注意,你不能放入篮子中任何已有的水果。
}
}
#[cfg(test)]
mod tests {
use super::*;
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);
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);
}
#[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);
}
#[test]
fn greater_than_eleven_fruits() {
let mut basket = get_fruit_basket();
fruit_basket(&mut basket);
let count = basket.values().sum::<u32>();
assert!(count > 11);
}
}