New utility function to load JSON

Author: Gonzalo Diaz

Cargo.lock

@@ -8,3 +8,6 @@ name = "exercises"
 crate-type = ["rlib", "cdylib"]
 
 [dependencies]
+serde_json = "1.0"
+serde = { version = "1.0", features = ["derive"] }
+once_cell = "1.21.3"

Cargo.toml

@@ -0,0 +1 @@
+pub mod utils;

tests/common/mod.rs

@@ -0,0 +1,10 @@
+use serde::de::DeserializeOwned;
+use std::fs;
+
+/// Carga un archivo JSON en un `Vec<T>`.
+pub fn load_json<T: DeserializeOwned>(path: &str) -> Vec<T> {
+    let contents = fs::read_to_string(path)
+        .unwrap_or_else(|_| panic!("No se pudo leer el archivo: {}", path));
+    serde_json::from_str(&contents)
+        .unwrap_or_else(|_| panic!("JSON inválido en {}", path))
+}