补充test_mql气动拓扑候选发现

tests/test_test_mql_branch_simulation.py

@@ -86,6 +86,33 @@ class TestMqlPneumaticBranchSimulationTests(unittest.TestCase):
         self.assertGreater(series["pn_general_chamber.p"][0], series["pn_general_chamber.p"][-1])
         self.assertLess(series["pn_c1_8.p"][0], series["pn_c1_8.p"][-1])
 
+    def test_discover_pneumatic_branch_topology_reports_blocked_candidates(self) -> None:
+        system = TestMqlSystem()
+
+        discovery = system.discover_pneumatic_branch_topology()
+
+        self.assertEqual(discovery.branch_specs, ())
+        self.assertEqual(len(discovery.blocked_candidates), 48)
+        candidates = {
+            candidate.connection_alias: candidate
+            for candidate in discovery.blocked_candidates
+        }
+        chamber_candidate = candidates["pneumatic_69"]
+        self.assertEqual(chamber_candidate.line_submodel, "PNL0001")
+        self.assertEqual(chamber_candidate.source_component, "pnnode4_16")
+        self.assertEqual(chamber_candidate.target_component, "pn_c1_8")
+        self.assertFalse(chamber_candidate.source_is_typed_pneumatic)
+        self.assertTrue(chamber_candidate.target_is_typed_pneumatic)
+        self.assertIn("node/line", chamber_candidate.reason)
+
+        orifice_candidate = candidates["pneumatic_96"]
+        self.assertEqual(orifice_candidate.line_submodel, "PNL0001")
+        self.assertEqual(orifice_candidate.source_component, "pn_node3_8")
+        self.assertEqual(orifice_candidate.target_component, "pn_orifice_18")
+        self.assertFalse(orifice_candidate.source_is_typed_pneumatic)
+        self.assertTrue(orifice_candidate.target_is_typed_pneumatic)
+        self.assertIn("node/line", orifice_candidate.reason)
+
     def test_simulate_pneumatic_branch_rejects_invalid_component_aliases(self) -> None:
         system = TestMqlSystem()