diff --git a/tests/test_opencode_review_normalize_output.py b/tests/test_opencode_review_normalize_output.py
new file mode 100644
index 0000000..6c4cc83
--- /dev/null
+++ b/tests/test_opencode_review_normalize_output.py
@@ -0,0 +1,19 @@
+import json
+from unittest.mock import patch
+
+from scripts.ci.opencode_review_normalize_output import iter_json_objects
+
+
+def test_iter_json_objects_decode_error():
+    """Test that iter_json_objects handles JSONDecodeError when decoding."""
+    text = "prefix { valid looking json } suffix"
+
+    # We mock raw_decode to raise JSONDecodeError to hit the except block explicitly
+    # This fulfills the 'Requires mocking the operation that throws the exception' rationale.
+    with patch("json.JSONDecoder.raw_decode") as mock_raw_decode:
+        mock_raw_decode.side_effect = json.JSONDecodeError("Mocked error", text, 0)
+
+        result = iter_json_objects(text)
+
+        assert result == []
+        assert mock_raw_decode.called