hook tracker

tests/test_mapping.py

@@ -1,7 +1,25 @@
+from dataclasses import dataclass, field
+
 from hooked_containers import events as e
 from hooked_containers.mapping import HookedMapping
 
 
+@dataclass
+class HookTracker:
+    added: list[e.AddItemEvent] = field(default_factory=list)
+    set: list[e.SetItemEvent] = field(default_factory=list)
+    removed: list[e.RemoveItemEvent] = field(default_factory=list)
+
+    def hook(self, event: e.ChangeEvent):
+        match event:
+            case e.AddItemEvent():
+                self.added.append(event.item)
+            case e.SetItemEvent():
+                self.set.append(event.item)
+            case e.RemoveItemEvent():
+                self.removed.append(event.item)
+
+
 class TestHookedMapping:
     class TestConstruction:
         def test_empty(self):
@@ -25,34 +43,26 @@ class TestHookedMapping:
 
     class TestMappingOps:
         def test_setitem(self):
-            added = []
+            tracker = HookTracker()
-
+            m = HookedMapping({}, tracker.hook)
-            def hook(event: e.ChangeEvent):
-                assert isinstance(event, e.AddItemEvent)
-                added.append(event.item)
-
-            m = HookedMapping({}, hook)
             m["a"] = 1
             assert m._data == {"a": 1}
-            assert added == [1]
+            assert tracker.added == [1]
 
         def test_nested_setitem(self):
-            added = []
+            tracker = HookTracker()
-
+            m = HookedMapping({"a": {}}, tracker.hook)
-            def hook(event: e.ChangeEvent):
-                assert isinstance(event, e.AddItemEvent)
-                added.append(event.item)
-
-            m = HookedMapping({"a": {}}, hook)
             m["a"]["x"] = 1
             assert m._data == {"a": {"x": 1}}
-            assert added == [1]
+            assert tracker.added == [1]
 
         def test_getitem(self):
             m = HookedMapping({"a": 1})
             assert m["a"] == 1
 
         def test_delitem(self):
-            m = HookedMapping({"a": 1})
+            tracker = HookTracker()
+            m = HookedMapping({"a": 1}, tracker.hook)
             del m["a"]
             assert not m["a"]
+            assert tracker.removed == [1]