test: add asset tests, file exists & has min size

tests/asset.rs

@@ -0,0 +1,25 @@
+use pacman::asset::Asset;
+use speculoos::prelude::*;
+use strum::IntoEnumIterator;
+
+#[test]
+fn all_asset_paths_exist() {
+    for asset in Asset::iter() {
+        let path = asset.path();
+        let full_path = format!("assets/game/{}", path);
+
+        let metadata = std::fs::metadata(&full_path)
+            .map_err(|e| format!("Error getting metadata for {}: {}", full_path, e))
+            .unwrap();
+        assert_that(&metadata.is_file()).is_true();
+        assert_that(&metadata.len()).is_greater_than(1024);
+    }
+}
+
+#[test]
+fn asset_paths_are_non_empty() {
+    for asset in Asset::iter() {
+        let path = asset.path();
+        assert!(!path.is_empty(), "Asset path for {:?} should not be empty", asset);
+    }
+}