Method __bool__

numpy/ma/tests/test_core.py:255–256

(self)

        # an object array that cannot be converted to bool always:
        class NotBool():
            def __bool__(self):
                raise ValueError("not a bool!")
        masked_obj = np.ma.masked_array([NotBool(), 'b'], mask=[True, False])
        # Check that the NotBool actually fails like we would expect:
        with pytest.raises(ValueError, match="not a bool!"):