Add test on ANDES conversion under parameter updating

tests/test_andes.py

@@ -89,6 +89,24 @@ def test_convert(self):
             for mdl in pflow_mdls:
                 self.assertTrue(sp.models[mdl].as_df().equals(sa.PFlow.models[mdl].as_df()))
 
+    def test_convert_after_update(self):
+        """
+        Test conversion from AMS case to ANDES case after updating parameters.
+        """
+        for ad_case, am_case in zip(self.ad_cases, self.am_cases):
+            sp = ams.load(ams.get_case(am_case),
+                          setup=True, no_output=True, default_config=True,)
+        # record initial values
+        pq_idx = sp.PQ.idx.v
+        p0 = sp.PQ.p0.v.copy()
+        sa = to_andes(sp, setup=False, no_output=True, default_config=True)
+        # before update
+        np.testing.assert_array_equal(sp.PQ.p0.v, sa.PQ.p0.v)
+        # after update
+        sp.PQ.set(src='p0', attr='v', idx=pq_idx, value=0.9*p0)
+        sa = to_andes(sp, setup=False, no_output=True, default_config=True)
+        np.testing.assert_array_equal(sp.PQ.p0.v, sa.PQ.p0.v)
+
     def test_extra_dyn(self):
         """
         Test conversion when extra dynamic models exist.