接入test_mql变容气室机械反馈

tests/test_amesim_pneumatic_components.py

@@ -91,6 +91,27 @@ class AmesimPneumaticComponentsTest(unittest.TestCase):
         volume.set_external_volume_m3(cm3_to_m3(34242.54636512914))
         self.assertAlmostEqual(volume.volume_cm3(), 49242.54636512914)
 
+    def test_variable_volume_boundary_work_uses_external_volume_rate(self) -> None:
+        volume = AmesimVariablePneumaticVolume.from_liters(
+            name="pn_c1_8",
+            dead_volume_liters=15.0,
+            p0=100000.0,
+            T0=293.15,
+        )
+        props = volume.properties()
+        volume.set_external_volume_m3(0.0, external_volume_rate_m3_s=2.0e-6)
+
+        derivative = volume.derivatives_from_two_connections(
+            port_a_m_flow=0.0,
+            connected_h_a=props.h,
+            port_b_m_flow=0.0,
+            connected_h_b=props.h,
+            internal_h=props.h,
+        )
+
+        self.assertAlmostEqual(derivative.m, 0.0)
+        self.assertAlmostEqual(derivative.U, -props.p * 2.0e-6)
+
     def test_orifice_returns_signed_mass_flow(self) -> None:
         orifice = AmesimPneumaticOrifice.from_mm2(
             name="pn_orifice_18",