diff --git a/tests/infrastructure/abri/test_abri_client.py b/tests/infrastructure/abri/test_abri_client.py
index 54146c825..2b232455c 100644
--- a/tests/infrastructure/abri/test_abri_client.py
+++ b/tests/infrastructure/abri/test_abri_client.py
@@ -14,7 +14,7 @@ from domain.abri.models import (
 )
 from infrastructure.abri.abri_client import AbriClient
 from infrastructure.abri.config import AbriConfig
-from infrastructure.abri.errors import AbriTransportError
+from infrastructure.abri.errors import AbriResponseParseError, AbriTransportError
 
 FIXTURE_DIR = Path(__file__).parents[2] / "abri"
 ENDPOINT_URL = "https://relay.example.test/api/DomnaRelay?code=test-function-key"
@@ -158,3 +158,17 @@ def test_log_job_raises_transport_error_when_the_relay_is_unreachable(
     # Act / Assert
     with pytest.raises(AbriTransportError):
         client.log_job(_spec_example_request())
+
+
+# --- log_job: ambiguous responses are retriable, never success or rejection ---
+
+
+def test_log_job_raises_retriable_parse_error_on_a_malformed_response_body(
+    client: AbriClient, mock_session: MagicMock
+) -> None:
+    # Arrange
+    mock_session.post.return_value.content = b"not xml at all <<<"
+
+    # Act / Assert
+    with pytest.raises(AbriResponseParseError):
+        client.log_job(_spec_example_request())