接入test_mql真实固定气室拓扑

tests/test_amesim_pneumatic_components.py

@@ -55,6 +55,30 @@ class AmesimPneumaticComponentsTest(unittest.TestCase):
         )
         self.assertGreater(volume.gas_mass_g(), 1300.0)
 
+    def test_volume_balances_two_connections_with_stream_enthalpy(self) -> None:
+        volume = AmesimPneumaticVolume.from_liters(
+            name="pn_general_chamber",
+            volume_liters=57.0,
+            p0=15.3e6,
+            T0=293.15,
+        )
+        internal_h = volume.properties().h
+
+        derivative = volume.derivatives_from_two_connections(
+            port_a_m_flow=0.2,
+            connected_h_a=internal_h + 1000.0,
+            port_b_m_flow=-0.1,
+            connected_h_b=internal_h - 1000.0,
+            internal_h=internal_h,
+        )
+
+        self.assertAlmostEqual(derivative.m, 0.1)
+        self.assertAlmostEqual(
+            derivative.U,
+            0.2 * (internal_h + 1000.0) - 0.1 * internal_h,
+        )
+        self.assertAlmostEqual(volume.port_a.p, volume.port_b.p)
+
     def test_variable_volume_tracks_external_volume(self) -> None:
         volume = AmesimVariablePneumaticVolume.from_liters(
             name="pn_c1_8",