添加气瓶计算过程文档

tests/test_gas_cylinder.py

@@ -1,4 +1,3 @@
-import numpy as np
 import pytest
 
 from cylinder.gas_cylinder import (
@@ -19,8 +18,6 @@ def test_default_high_pressure_cylinder_state_matches_inputs():
     assert abs(cylinder.T - DEFAULT_T_INIT) < 1e-8
     assert cylinder.mass > 0
     assert cylinder.U > 0
-    assert cylinder.gamma > 1.0
-    assert cylinder.compressibility_factor > 0.0
 
 
 def test_cylinder_accepts_configurable_fluid_pressure_volume_temperature():
@@ -38,6 +35,23 @@ def test_cylinder_accepts_configurable_fluid_pressure_volume_temperature():
     assert cylinder.mass > 0
 
 
+def test_cylinder_state_summary_omits_unused_thermodynamic_helpers():
+    cylinder = HighPressureGasCylinder()
+    summary = cylinder.state_summary()
+
+    assert set(summary) == {
+        "fluid",
+        "V",
+        "mass",
+        "rho",
+        "P",
+        "T",
+        "U",
+        "u",
+        "h",
+    }
+
+
 def test_cylinder_ghost_state_is_stagnant_conservative_vector():
     cylinder = HighPressureGasCylinder()
     ghost = cylinder.ghost_state()