diff --git a/tests/test_service_users.py b/tests/test_service_users.py
index e69de29..6f37128 100644
--- a/tests/test_service_users.py
+++ b/tests/test_service_users.py
@@ -0,0 +1,69 @@
+from app.services import user_service
+from app.services.user_service import (
+    authenticate_user,
+    delete_user,
+    get_user,
+    register_user,
+)
+
+
+def test_register_user():
+    image_path = "images/Aaron_Peirsol/Aaron_Peirsol_0001.jpg"
+    user_id = "aaron_peirsol"
+
+    with open(image_path, "rb") as f:
+        image_data = f.read()
+        result = register_user(user_id, image_data)
+
+    assert result["user_id"] == "aaron_peirsol"
+    assert result["registered_at"] is not None
+
+
+def test_autenticate_registered_user(setup_user_db):
+
+    image_path = "images/Aaron_Peirsol/Aaron_Peirsol_0001.jpg"
+
+    with open(image_path, "rb") as f:
+        image_data = f.read()
+        user_id = authenticate_user(image_data)
+
+    assert user_id == "aaron_peirsol"
+
+
+def test_authenticate_unregistered_user(setup_user_db):
+
+    image_path = "images/Natasha_McElhone/Natasha_McElhone_0001.jpg"
+    with open(image_path, "rb") as f:
+        image_data = f.read()
+
+    user_id = authenticate_user(image_data)
+
+    assert user_id is None
+
+
+def test_get_registered_user(setup_user_db):
+    user_id = "aaron_peirsol"
+    user_info = get_user(user_id)
+
+    assert user_info["user_id"] == user_id
+    assert "registered_at" in user_info
+
+
+def test_delete_registered_user(setup_user_db):
+    user_id = "aaron_peirsol"
+    result = delete_user(user_id)
+
+    assert result is True
+    user_info = get_user(user_id)
+    assert user_info is None
+
+
+def test_get_unregistered_user(setup_user_db):
+    # Given: 등록되지 않은 사용자 ID
+    unregistered_user_id = "non_existing_user"
+
+    # When: 사용자 정보 조회 서비스를 호출
+    result = user_service.get_user(unregistered_user_id)
+
+    # Then: 사용자 정보 조회 서비스가 None을 반환해야 함
+    assert result is None