tests: Add URL

tests/test_cli.py

@@ -140,7 +140,8 @@ def test_golden(
     time_machine: TimeMachineFixture,
     nb_arg: str,
 ) -> None:
-    httpx_mock.add_response(  # FIXME add URL?
+    httpx_mock.add_response(
+        url="http://localhost:5000/testbook",
         method="POST",
         json=golden["input"],
         status_code=golden.get("http_status", 200),