Add tests for the static file handler

src/handlers/static_files.rs

@@ -5,3 +5,19 @@ use rocket::response::NamedFile;
 fn all(path: PathBuf) -> Option<NamedFile> {
     NamedFile::open(Path::new("static/").join(path)).ok()
 }
+
+#[cfg(test)]
+mod tests {
+    use rocket;
+    use rocket::http::Status;
+    use rocket::local::Client;
+
+    #[test]
+    fn all() {
+        let client = Client::new(rocket(Some("test"))).unwrap();
+
+        // Try to get the main JavaScript file
+        let res = client.get("/js/wishlists.js").dispatch();
+        assert_eq!(res.status(), Status::Ok);
+    }
+}