Guard mixing

test_tjnetwork.py

@@ -3036,6 +3036,8 @@ class TestApi:
 
         add_tank(p, ChangeSet({'id': 't0', 'x': 0.0, 'y': 10.0, 'elevation': 20.0, 'init_level': 1.0, 'min_level': 0.0, 'max_level': 2.0, 'diameter': 10.0, 'min_vol': 100.0, 'vol_curve': None, 'overflow': OVERFLOW_NO}))
 
+        assert get_mixing(p, 't0') == {}
+
         add_mixing(p, ChangeSet({'tank': 't0', 'model': MIXING_MODEL_MIXED, 'value': 10.0}))
         m = get_mixing(p,'t0')
         assert m['tank'] == 't0'
@@ -3056,6 +3058,8 @@ class TestApi:
 
         delete_mixing(p, ChangeSet({'tank': 't0'}))
 
+        assert get_mixing(p, 't0') == {}
+
         self.leave(p)