diff --git a/core/src/services/admin_service.rs b/core/src/services/admin_service.rs
index 71bda95..76c719a 100644
--- a/core/src/services/admin_service.rs
+++ b/core/src/services/admin_service.rs
@@ -13,19 +13,9 @@ impl AdminService {
         admin_id: i32,
         password: String,
     ) -> Result<String, ServiceError> {
-        let admin = Query::find_admin_by_id(db, admin_id).await?;
-
-        let Some(admin) = admin else {
-            return Err(ServiceError::CandidateNotFound);
-        };
-
+        let admin = Query::find_admin_by_id(db, admin_id).await?.ok_or(ServiceError::InvalidCredentials)?;
         let private_key_encrypted = admin.private_key;
-
-        let private_key = crypto::decrypt_password(private_key_encrypted, password).await;
-
-        let Ok(private_key) = private_key else {
-            return Err(ServiceError::CryptoDecryptFailed);
-        };
+        let private_key = crypto::decrypt_password(private_key_encrypted, password).await?;
 
         Ok(private_key)
     }
@@ -36,24 +26,64 @@ impl AdminService {
         password: String,
         ip_addr: String,
     ) -> Result<(String, String), ServiceError> {
-        let session_id =
-            SessionService::new_session(db, None, Some(admin_id), password.clone(), ip_addr).await;
-        match session_id {
-            Ok(session_id) => {
-                let private_key = Self::decrypt_private_key(db, admin_id, password).await?;
-                Ok((session_id, private_key))
-            }
-            Err(e) => Err(e),
-        }
+        let session_id = SessionService::new_session(db,
+            None,
+            Some(admin_id),
+            password.clone(),
+            ip_addr
+        )
+            .await?;
+        
+        let private_key = Self::decrypt_private_key(db, admin_id, password).await?;
+        Ok((session_id, private_key))
     }
 
     pub async fn auth(db: &DbConn, session_uuid: Uuid) -> Result<admin::Model, ServiceError> {
-        match SessionService::auth_user_session(db, session_uuid).await {
-            Ok(user) => match user {
-                AdminUser::Admin(admin) => Ok(admin),
-                AdminUser::Candidate(_) => unreachable!(),
-            },
-            Err(e) => Err(e),
+        match SessionService::auth_user_session(db, session_uuid).await? {
+            AdminUser::Admin(admin) => Ok(admin),
+            AdminUser::Candidate(_) => unreachable!(),
         }
     }
 }
+
+#[cfg(test)]
+mod admin_tests {
+    use chrono::Local;
+    use entity::admin;
+    use sea_orm::{Set, ActiveModelTrait};
+
+    use crate::{util::get_memory_sqlite_connection, error::ServiceError};
+
+    use super::*;
+
+
+    #[tokio::test]
+    async fn test_admin_login() -> Result<(), ServiceError> {
+        let db = get_memory_sqlite_connection().await;
+        let _ = admin::ActiveModel {
+            id: Set(1),
+            name: Set("Admin".to_owned()),
+            public_key: Set("age1u889gp407hsz309wn09kxx9anl6uns30m27lfwnctfyq9tq4qpus8tzmq5".to_owned()),
+            // AGE-SECRET-KEY-14QG24502DMUUQDT2SPMX2YXPSES0X8UD6NT0PCTDAT6RH8V5Q3GQGSRXPS
+            private_key: Set("5KCEGk0ueWVGnu5Xo3rmpLoilcVZ2ZWmwIcdZEJ8rrBNW7jwzZU/XTcTXtk/xyy/zjF8s+YnuVpOklQvX3EC/Sn+ZwyPY3jokM2RNwnZZlnqdehOEV1SMm/Y".to_owned()),
+            // test
+            password: Set("$argon2i$v=19$m=6000,t=3,p=10$WE9xCQmmWdBK82R4SEjoqA$TZSc6PuLd4aWK2x2WAb+Lm9sLySqjK3KLbNyqyQmzPQ".to_owned()),
+            created_at: Set(Local::now().naive_local()),
+            updated_at: Set(Local::now().naive_local()),
+            ..Default::default()
+        }
+            .insert(&db)
+            .await?;
+
+        let (session_id, _private_key) = AdminService::login(&db, 1, "test".to_owned(), "127.0.0.1".to_owned()).await?;
+
+        let logged_admin = AdminService::auth(&db, session_id.parse().unwrap()).await?;
+
+        assert_eq!(logged_admin.id, 1);
+        assert_eq!(logged_admin.name, "Admin");
+        
+
+        Ok(())
+
+    }
+}
\ No newline at end of file
diff --git a/core/src/services/session_service.rs b/core/src/services/session_service.rs
index f81cc3e..4960fc4 100644
--- a/core/src/services/session_service.rs
+++ b/core/src/services/session_service.rs
@@ -162,7 +162,12 @@ impl SessionService {
 
 #[cfg(test)]
 mod tests {
-    use sea_orm::prelude::Uuid;
+    use entity::{admin, candidate, session, parent};
+
+    use sea_orm::{
+        prelude::Uuid, sea_query::TableCreateStatement, ConnectionTrait, Database, DbBackend,
+        DbConn, Schema,
+    };
 
     use crate::{
         crypto,