test: add tests for collision, items, directional, sprite

enum macros for FruitKind

src/entity/item.rs

@@ -40,6 +40,7 @@ pub enum FruitKind {
 }
 
 impl FruitKind {
+    #[allow(dead_code)]
     pub fn index(self) -> u8 {
         match self {
             FruitKind::Apple => 0,