event fixes

tests/test_mapping.py

@@ -24,9 +24,18 @@ class TestHookedMapping:
 
     class TestMappingOps:
         def test_setitem(self):
-            m = HookedMapping({})
+            added = []
+            m = HookedMapping({}, lambda e: added.append(e.item))
             m["a"] = 1
             assert m._data == {"a": 1}
+            assert added == [1]
+
+        def test_nested_setitem(self):
+            added = []
+            m = HookedMapping({"a": {}}, lambda e: added.append(e.item))
+            m["a"]["x"] = 1
+            assert m._data == {"a": {"x": 1}}
+            assert added == [1]
 
         def test_getitem(self):
             m = HookedMapping({"a": 1})