add unit tests

src/model/user.rs

@@ -45,7 +45,7 @@ WHERE id like ?
         .ok()
     }
 
-    async fn find_by_name(db: &SqlitePool, name: String) -> Option<Self> {
+    pub async fn find_by_name(db: &SqlitePool, name: String) -> Option<Self> {
         sqlx::query_as!(
             User,
             "