diff --git a/tests/integration/test_parser_synthesis_order.py b/tests/integration/test_parser_synthesis_order.py
new file mode 100644
index 00000000..73766f94
--- /dev/null
+++ b/tests/integration/test_parser_synthesis_order.py
@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+from openamp_foundry.cli.main import build_parser
+
+
+def test_synthesis_order_parser_defaults_are_stable():
+    parser = build_parser()
+    args = parser.parse_args(["synthesis-order"])
+
+    assert args.command == "synthesis-order"
+    assert args.panel_csv == "outputs/confident_panel.csv"
+    assert args.out_csv == "outputs/synthesis_order.csv"
+    assert args.out_md == "outputs/synthesis_checklist.md"
+    assert args.quantity_mg == 5.0