chore: add test for reverse bitmask

tests/test_shortcuts.py

@@ -45,6 +45,12 @@ def test_wrap_exe(dummy_app) -> None:
     assert s.shortcuts["shortcuts"]["0"]["Exe"][-1] == '"'
 
 
+def test_convert_signed_to_unsigned(dummy_app) -> None:
+    s = Shortcuts(Path(""))
+    s.add_shortcut(*dummy_app.values())
+    assert s.find_appname_by_unsigned_id(3683462515) == "TEST APP"
+
+
 def test_add_shortcut(dummy_app) -> None:
     s = Shortcuts(Path(""))
     s.add_shortcut(*dummy_app.values())