Add tests for `Result.__dir__`
This method gives me a warning for the use of the + operator.
Class `KeysView` does not define `__add__`, so the `+` operator cannot be used on its instancesWe should tests to assure that this works as intended.
This method gives me a warning for the use of the + operator.
Class `KeysView` does not define `__add__`, so the `+` operator cannot be used on its instancesWe should tests to assure that this works as intended.