Fix all_fruits_types_in_basket to fail if all fruit kinds are not included

exercises/11_hashmaps/hashmaps2.rs

@@ -18,7 +18,7 @@
 
 use std::collections::HashMap;
 
-#[derive(Hash, PartialEq, Eq)]
+#[derive(Hash, PartialEq, Eq, Debug)]
 enum Fruit {
     Apple,
     Banana,
@@ -27,6 +27,14 @@ enum Fruit {
     Pineapple,
 }
 
+const FRUIT_KINDS: [Fruit; 5] = [
+    Fruit::Apple,
+    Fruit::Banana,
+    Fruit::Mango,
+    Fruit::Lychee,
+    Fruit::Pineapple,
+];
+
 fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
     let fruit_kinds = vec![
         Fruit::Apple,
@@ -86,7 +94,10 @@ mod tests {
     fn all_fruit_types_in_basket() {
         let mut basket = get_fruit_basket();
         fruit_basket(&mut basket);
-        for amount in basket.values() {
+        for fruit_kind in FRUIT_KINDS {
+            let amount = basket
+                .get(&fruit_kind)
+                .expect(format!("Fruit kind {:?} was not found in basket", fruit_kind).as_str());
             assert_ne!(amount, &0);
         }
     }