拆解test_mql变容气室RHS

tests/test_test_mql_pnl0001_segment.py

@@ -684,6 +684,32 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
         self.assertAlmostEqual(rhs[128], expected_contact_force / support_mass)
         self.assertAlmostEqual(rhs[129], 0.0)
 
+    def test_full_state_closure_diagnoses_variable_chamber_rhs_terms(self) -> None:
+        closure = self.system.full_state_closure_from_spec(
+            self.spec,
+            inlet_node_pressure_pa=15.31e6,
+            resistance_boundary_pressure_pa=15.29e6,
+        )
+        state = closure.initial_state_vector()
+
+        diagnostic = closure.variable_chamber_rhs_diagnostic(
+            chamber_alias="pn_c1_8",
+            state_vector=state,
+        )
+        rhs = closure.rhs(state)
+
+        self.assertEqual(diagnostic.piston_alias, "pn_brp2_8")
+        self.assertAlmostEqual(diagnostic.chamber_volume_m3, 0.015)
+        self.assertAlmostEqual(diagnostic.chamber_volume_rate_m3_s, 0.0)
+        self.assertAlmostEqual(diagnostic.mass_derivative_kg_s, rhs[46])
+        self.assertAlmostEqual(diagnostic.energy_derivative_w, rhs[47])
+        self.assertAlmostEqual(
+            diagnostic.energy_derivative_w,
+            diagnostic.port_a_energy_flow_w
+            + diagnostic.port_b_energy_flow_w
+            + diagnostic.boundary_work_w,
+        )
+
     def test_simulates_full_state_key_data_paths_for_amesim_comparison(self) -> None:
         data_paths = (
             "press@pn_c1_8",