diff --git a/docker/tests/conftest.py b/docker/tests/conftest.py
--- a/docker/tests/conftest.py
+++ b/docker/tests/conftest.py
@@ -125,7 +125,7 @@
 
     url = urljoin(APIURL, path)
     resp = requests.request(verb, url, **kwargs)
-    assert resp.status_code == 200, f'failed to retrieve {url} ({resp})'
+    assert resp.status_code == 200, f'failed to retrieve {url}: {resp.text}'
     return resp.json()