Note reversed

j5/components/piezo.py

@@ -3,7 +3,7 @@
 from abc import abstractmethod
 from datetime import timedelta
 from enum import IntEnum
-from typing import Type, Union
+from typing import Generator, Type, Union
 
 from j5.boards import Board
 from j5.components import Component, Interface
@@ -31,6 +31,12 @@ class Note(IntEnum):
     A7 = 3520
     B7 = 3951
 
+    def __reverse__(self) -> Generator['Note', None, None]:
+        # Type is ignored because of an open bug within mypy
+        # https://github.com/python/typeshed/issues/1590
+        # https://github.com/python/typeshed/issues/1595
+        yield from reversed(self.__members__.items())  # type: ignore
+
 
 Pitch = Union[int, Note]
 

tests/components/test_piezo.py

@@ -77,3 +77,8 @@ def test_piezo_buzz_invalid_value():
         piezo.buzz(MockPiezoBoard, 0, 0, -42)
     with pytest.raises(TypeError):
         piezo.buzz(MockPiezoBoard, 0, 0, "j5")
+
+
+def test_note_reversed():
+    """Test Note reversed dunder method."""
+    assert list(reversed(list(Note))) == list(reversed(Note))