diff --git a/model_data/tests/test_downloader.py b/model_data/tests/test_downloader.py
index 644f1caa..3c1492a9 100644
--- a/model_data/tests/test_downloader.py
+++ b/model_data/tests/test_downloader.py
@@ -17,7 +17,7 @@ class TestDownloader:
     def mock_client(self, mocker):
         # mocker is a wrapper around unittest.mock.Mock, extending with
         # additional features specific to pytest
-        client = mocker.Mock(spec=EpcClient())
+        client = mocker.Mock(spec=EpcClient(auth_token="123"))
         client.domestic.search.return_value = mock_epc_response
         return client