Make TestMGDA extend WeakStationarityProperty

Author: ValerianRey

tests/unit/aggregation/test_mgda.py

@@ -9,11 +9,17 @@
     ExpectedStructureProperty,
     NonConflictingProperty,
     PermutationInvarianceProperty,
+    WeakStationarityProperty,
 )
 
 
 @mark.parametrize("aggregator", [MGDA()])
-class TestMGDA(ExpectedStructureProperty, NonConflictingProperty, PermutationInvarianceProperty):
+class TestMGDA(
+    ExpectedStructureProperty,
+    NonConflictingProperty,
+    PermutationInvarianceProperty,
+    WeakStationarityProperty,
+):
     pass