add pytest case

backend/app/tests/test_auth.py

@@ -0,0 +1,8 @@
+
+def test_usr_login(test_client,test_user):
+    response = test_client.post("/api/token", data={"username": test_user["email"], "password": test_user["password"]})
+    assert response.status_code == 200
+    assert "access_token" in response.json()
+    assert "token_type" in response.json()
+    assert response.json()["user_name"] == test_user["first_name"]+  " " + test_user["last_name"]
+