added unit tests

src/types/game.rs

@@ -14,6 +14,12 @@ pub struct Game {
 }
 
 impl Game {
+    pub fn new(path: impl AsRef<Path>) -> Self {
+        Self {
+            path: path.as_ref().to_owned(),
+        }
+    }
+
     pub fn export_links(&self) -> Result<Vec<Link>, io::Error> {
         let links: Vec<Link> = walk_all_files(&self.path)?
             .map(|entry| {