tests/functional/i/invalid/b/invalid_bool_returned.py

"""Check invalid value returned by __bool__ """

# pylint: disable=too-few-public-methods,missing-docstring,no-self-use,import-error, useless-object-inheritance
import six

from missing import Missing


class FirstGoodBool(object):
    """__bool__ returns <type 'bool'>"""

    def __bool__(self):
        return True


class SecondGoodBool(object):
    """__bool__ returns <type 'bool'>"""

    def __bool__(self):
        return bool(0)


class BoolMetaclass(type):
    def __bool__(cls):
        return True


@six.add_metaclass(BoolMetaclass)
class ThirdGoodBool(object):
    """Bool through the metaclass."""


class FirstBadBool(object):
    """ __bool__ returns an integer """

    def __bool__(self):  # [invalid-bool-returned]
        return 1


class SecondBadBool(object):
    """ __bool__ returns str """

    def __bool__(self):  # [invalid-bool-returned]
        return "True"


class ThirdBadBool(object):
    """ __bool__ returns node which does not have 'value' in AST """

    def __bool__(self):  # [invalid-bool-returned]
        return lambda: 3


class AmbigousBool(object):
    """ Uninferable return value """
    __bool__ = lambda self: Missing


class AnotherAmbiguousBool(object):
    """Potential uninferable return value"""
    def __bool__(self):
        return bool(Missing)