diff --git a/tests/tests.rs b/tests/tests.rs
index dd0c2fe..39d5a6d 100644
--- a/tests/tests.rs
+++ b/tests/tests.rs
@@ -135,7 +135,7 @@ pub mod requests {
     }
 
 
-    pub async fn login_service_user(app: &axum::Router, username: &String, passphrase: &String) -> Result<axum::response::Response, std::convert::Infallible> {
+    pub async fn login_service_user(app: &axum::Router, username: &str, passphrase: &str) -> Result<axum::response::Response, std::convert::Infallible> {
         let payload = serde_json::json!({
             "username": username,
             "passphrase": passphrase,
@@ -255,7 +255,7 @@ async fn register_service_user(app: &axum::Router,) -> Result<textsender_models:
     }
 }
 
-async fn login_service_user(app: &axum::Router, username: &String, passphrase: &String) -> Result<textsender_models::token::LoginResult, std::io::Error> {
+async fn login_service_user(app: &axum::Router, username: &str, passphrase: &str) -> Result<textsender_models::token::LoginResult, std::io::Error> {
     match requests::login_service_user(&app, username, passphrase).await {
         Ok(response) => {
             if axum::http::StatusCode::OK != response.status() {