tests/test_eda_router_contract.py

@@ -79,6 +79,31 @@ class EdaRouterPinsContractTest(unittest.TestCase):
         self.assertEqual(link.bundle, "output_bus")
         self.assertEqual(link.route_group, "stage_1")
 
+    def test_builder_uses_frontend_bundle_key_as_explicit_route_group(self):
+        from mxpic_router.builder import _link_explicit_route_group
+        from mxpic_router.eda_loader import LinkSpec
+
+        self.assertEqual(
+            _link_explicit_route_group(LinkSpec(bundle="optical_bus")),
+            "optical_bus",
+        )
+        self.assertEqual(
+            _link_explicit_route_group(LinkSpec(bundle="free_wires")),
+            "",
+        )
+        self.assertEqual(
+            _link_explicit_route_group(LinkSpec(bundle="free_wires_metal_1")),
+            "",
+        )
+        self.assertEqual(
+            _link_explicit_route_group(LinkSpec(bundle="output_bus")),
+            "",
+        )
+        self.assertEqual(
+            _link_explicit_route_group(LinkSpec(bundle="output_bus", route_group="stage_1")),
+            "stage_1",
+        )
+
     def test_port_element_creates_named_io_pins_and_inside_route_pins(self):
         from mxpic_router.builder import _register_element_pins
         from mxpic_router.eda_loader import parse_cell_dict