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Current File : /opt/hc_python/lib/python3.12/site-packages/aenum//test_v3.py
from . import EnumMeta, Enum, IntEnum, Flag, IntFlag, StrEnum, UniqueEnum, AutoEnum, AddValueEnum
from . import NamedTuple, TupleSize, MagicValue, AddValue, NoAlias, Unique, MultiValue
from . import AutoNumberEnum,MultiValueEnum, OrderedEnum, unique, skip, extend_enum, auto
from ._enum import StdlibEnumMeta, StdlibEnum, StdlibIntEnum, StdlibFlag, StdlibIntFlag, StdlibStrEnum
from . import pyver, PY3_3, PY3_4, PY3_5, PY3_6, PY3_7, PY3_11
from . import add_stdlib_integration, remove_stdlib_integration

from collections import OrderedDict
from datetime import timedelta
from pickle import dumps, loads, PicklingError, HIGHEST_PROTOCOL
from unittest import TestCase, main

import os
import sys
import tempfile
import textwrap
import unittest

try:
    import pyparsing
except (ImportError, SyntaxError):
    pyparsing = None

try:
    RecursionError
except NameError:
    # python3.4
    RecursionError = RuntimeError

class TestEnumV3(TestCase):

    def setUp(self):
        class Season(Enum):
            SPRING = 1
            SUMMER = 2
            AUTUMN = 3
            WINTER = 4
        self.Season = Season

        class Konstants(float, Enum):
            E = 2.7182818
            PI = 3.1415926
            TAU = 2 * PI
        self.Konstants = Konstants

        class Grades(IntEnum):
            A = 5
            B = 4
            C = 3
            D = 2
            F = 0
        self.Grades = Grades

        class Directional(str, Enum):
            EAST = 'east'
            WEST = 'west'
            NORTH = 'north'
            SOUTH = 'south'
        self.Directional = Directional

        from datetime import date
        class Holiday(date, Enum):
            NEW_YEAR = 2013, 1, 1
            IDES_OF_MARCH = 2013, 3, 15
        self.Holiday = Holiday

    @unittest.skipUnless(StdlibEnumMeta, 'Stdlib enum not available')
    def test_stdlib_inheritence(self):
        # 3.4
        self.assertTrue(issubclass(self.Season, StdlibEnum))
        self.assertTrue(isinstance(self.Season.SPRING, StdlibEnum))
        self.assertTrue(issubclass(self.Grades, StdlibEnum))
        self.assertFalse(issubclass(self.Grades, StdlibIntEnum))
        self.assertTrue(isinstance(self.Grades.A, StdlibEnum))
        self.assertFalse(isinstance(self.Grades.A, StdlibIntEnum))
        #
        if pyver >= PY3_6:
            class AFlag(Flag):
                one = 1
            self.assertTrue(issubclass(AFlag, StdlibEnum))
            self.assertTrue(isinstance(AFlag.one, StdlibEnum))
            self.assertTrue(issubclass(AFlag, StdlibFlag))
            self.assertTrue(isinstance(AFlag.one, StdlibFlag))
            #
            class AnIntFlag(IntFlag):
                one = 1
            self.assertTrue(issubclass(AnIntFlag, StdlibEnum))
            self.assertTrue(isinstance(AnIntFlag.one, StdlibEnum))
            self.assertTrue(issubclass(AnIntFlag, StdlibFlag))
            self.assertTrue(isinstance(AnIntFlag.one, StdlibFlag))
            self.assertFalse(issubclass(AnIntFlag, StdlibIntFlag))
            self.assertFalse(isinstance(AnIntFlag.one, StdlibIntFlag))
        #
        if pyver >= PY3_11:
            class AStrEnum(StrEnum):
                one = '1'
            self.assertTrue(issubclass(AStrEnum, StdlibEnum))
            self.assertTrue(isinstance(AStrEnum.one, StdlibEnum))
            self.assertFalse(issubclass(AStrEnum, StdlibStrEnum))
            self.assertFalse(isinstance(AStrEnum.one, StdlibStrEnum))

    @unittest.skipUnless(StdlibEnumMeta, 'Stdlib enum not available')
    def test_stdlib_bad_getattribute(self):
        try:
            add_stdlib_integration()
            class BadEnumType(StdlibEnumMeta):
                def __getattribute__(cls, name):
                    obj = super().__getattribute__(name)
                    if isinstance(obj, cls):
                        obj.deprecate()
                    return obj
            with self.assertRaisesRegex(RecursionError, 'endless recursion'):
                class BaseEnum(StdlibEnum):
                    pass
                class BadEnum(BaseEnum, metaclass=BadEnumType):
                    FOO = 'bar'
        finally:
            remove_stdlib_integration()
        #
        class OkayEnum(StdlibEnum, metaclass=BadEnumType):
            FOO = 'bar'

    @unittest.skipUnless(pyver >= PY3_5, '__qualname__ requires python 3.5 or greater')
    def test_pickle_enum_function_with_qualname(self):
        Theory = Enum('Theory', 'rule law supposition', qualname='spanish_inquisition')
        globals()['spanish_inquisition'] = Theory
        test_pickle_dump_load(self.assertTrue, Theory.rule)
        test_pickle_dump_load(self.assertTrue, Theory)

    def test_auto_init(self):
        class Planet(Enum, init='mass radius'):
            MERCURY = (3.303e+23, 2.4397e6)
            VENUS   = (4.869e+24, 6.0518e6)
            EARTH   = (5.976e+24, 6.37814e6)
            MARS    = (6.421e+23, 3.3972e6)
            JUPITER = (1.9e+27,   7.1492e7)
            SATURN  = (5.688e+26, 6.0268e7)
            URANUS  = (8.686e+25, 2.5559e7)
            NEPTUNE = (1.024e+26, 2.4746e7)
            @property
            def surface_gravity(self):
                # universal gravitational constant  (m3 kg-1 s-2)
                G = 6.67300E-11
                return G * self.mass / (self.radius * self.radius)
        self.assertEqual(round(Planet.EARTH.surface_gravity, 2), 9.80)
        self.assertEqual(Planet.EARTH.value, (5.976e+24, 6.37814e6))

    def test_auto_init_with_value(self):
        class Color(Enum, init='value, rgb'):
            RED = 1, (1, 0, 0)
            BLUE = 2, (0, 1, 0)
            GREEN = 3, (0, 0, 1)
        self.assertEqual(Color.RED.value, 1)
        self.assertEqual(Color.BLUE.value, 2)
        self.assertEqual(Color.GREEN.value, 3)
        self.assertEqual(Color.RED.rgb, (1, 0, 0))
        self.assertEqual(Color.BLUE.rgb, (0, 1, 0))
        self.assertEqual(Color.GREEN.rgb, (0, 0, 1))

    def test_auto_turns_off(self):
        with self.assertRaises(NameError):
            class Color(Enum, settings=MagicValue):
                red
                green
                blue
                def hello(self):
                    print('Hello!  My serial is %s.' % self.value)
                rose
        with self.assertRaises(NameError):
            class Color(Enum, settings=MagicValue):
                red
                green
                blue
                def __init__(self, *args):
                    pass
                rose

    def test_magic(self):
        class Color(Enum, settings=MagicValue):
            red, green, blue
        self.assertEqual(list(Color), [Color.red, Color.green, Color.blue])
        self.assertEqual(Color.red.value, 1)

    def test_ignore_not_overridden(self):
        with self.assertRaisesRegex(TypeError, 'object is not callable'):
            class Color(Flag):
                _ignore_ = 'irrelevent'
                _settings_ = MagicValue
                @property
                def shade(self):
                    print('I am light', self.name.lower())

    def test_magic_start(self):
        class Color(Enum, settings=MagicValue, start=0):
            red, green, blue
        self.assertEqual(list(Color), [Color.red, Color.green, Color.blue])
        self.assertEqual(Color.red.value, 0)

    def test_dir_on_class(self):
        Season = self.Season
        self.assertEqual(
            set(dir(Season)),
            set(['__class__', '__doc__', '__members__', '__module__',
                'SPRING', 'SUMMER', 'AUTUMN', 'WINTER',
                '__init_subclass__', '__name__', '__getitem__', '__len__',
                '__contains__', '__iter__', '__qualname__',
                ]))

    def test_dir_on_item(self):
        Season = self.Season
        self.assertEqual(
            set(dir(Season.WINTER)),
            set(['__class__', '__doc__', '__eq__', '__hash__', '__module__', 'name', 'value', 'values']),
            )

    def test_dir_with_added_behavior(self):
        class Test(Enum):
            this = 'that'
            these = 'those'
            def wowser(self):
                return ("Wowser! I'm %s!" % self.name)
        self.assertEqual(
                set(dir(Test)),
                set([
                    '__class__', '__doc__', '__members__', '__module__', 'this', 'these',
                    '__init_subclass__', '__name__', '__getitem__', '__len__',
                    '__contains__', '__iter__', '__qualname__',
                    ]))
        self.assertEqual(
                set(dir(Test.this)),
                set(['__class__', '__doc__', '__eq__', '__hash__', '__module__', 'name', 'value', 'values', 'wowser']),
                )

    def test_dir_on_sub_with_behavior_on_super(self):
        # see issue22506
        class SuperEnum(Enum):
            def invisible(self):
                return "did you see me?"
        class SubEnum(SuperEnum):
            sample = 5
        self.assertEqual(
                set(dir(SubEnum.sample)),
                set(['__class__', '__doc__', '__eq__', '__hash__', '__module__', 'name', 'value', 'values', 'invisible']),
                )

    def test_members_are_always_ordered(self):
        class AlwaysOrdered(Enum):
            first = 1
            second = 2
            third = 3
        self.assertTrue(type(AlwaysOrdered.__members__) is OrderedDict)

    def test_comparisons(self):
        def bad_compare():
            Season.SPRING > 4
        Season = self.Season
        self.assertNotEqual(Season.SPRING, 1)
        self.assertRaises(TypeError, bad_compare)

        class Part(Enum):
            SPRING = 1
            CLIP = 2
            BARREL = 3

        self.assertNotEqual(Season.SPRING, Part.SPRING)
        def bad_compare():
            Season.SPRING < Part.CLIP
        self.assertRaises(TypeError, bad_compare)

    def test_duplicate_name(self):
        with self.assertRaises(TypeError):
            class Color1(Enum):
                red = 1
                green = 2
                blue = 3
                red = 4

        with self.assertRaises(TypeError):
            class Color2(Enum):
                red = 1
                green = 2
                blue = 3
                def red(self):
                    return 'red'

        with self.assertRaises(TypeError):
            class Color3(Enum):
                @property
                def red(self):
                    return 'redder'
                red = 1
                green = 2
                blue = 3

    def test_duplicate_value_with_unique(self):
        with self.assertRaises(ValueError):
            class Color(Enum, settings=Unique):
                red = 1
                green = 2
                blue = 3
                rojo = 1

    def test_duplicate_value_with_noalias(self):
        class Color(Enum, settings=NoAlias):
            red = 1
            green = 2
            blue = 3
            rojo = 1
        self.assertFalse(Color.red is Color.rojo)
        self.assertEqual(Color.red.value, 1)
        self.assertEqual(Color.rojo.value, 1)
        self.assertEqual(len(Color), 4)
        self.assertEqual(list(Color), [Color.red, Color.green, Color.blue, Color.rojo])

    def test_noalias_value_lookup(self):
        class Color(Enum, settings=NoAlias):
            red = 1
            green = 2
            blue = 3
            rojo = 1
        self.assertRaises(TypeError, Color, 2)

    def test_multivalue(self):
        class Color(Enum, settings=MultiValue):
            red = 1, 'red'
            green = 2, 'green'
            blue = 3, 'blue'
        self.assertEqual(Color.red.value, 1)
        self.assertIs(Color('green'), Color.green)
        self.assertEqual(Color.blue.values, (3, 'blue'))

    def test_multivalue_with_duplicate_values(self):
        with self.assertRaises(ValueError):
            class Color(Enum, settings=MultiValue):
                red = 1, 'red'
                green = 2, 'green'
                blue = 3, 'blue', 'red'

    def test_multivalue_with_duplicate_values_and_noalias(self):
        with self.assertRaises(TypeError):
            class Color(Enum, settings=(MultiValue, NoAlias)):
                red = 1, 'red'
                green = 2, 'green'
                blue = 3, 'blue', 'red'

    def test_multivalue_and_auto(self):
        with self.assertRaisesRegex(TypeError, r'MultiValue and MagicValue are mutually exclusive'):
            class Color(Enum, settings=(MultiValue, MagicValue)):
                red
                green = 3, 'green'
                blue

    def test_autonumber_and_init(self):
        class Field(IntEnum, settings=AddValue, init='__doc__'):
            TYPE = "Char, Date, Logical, etc."
            START = "Field offset in record"
        self.assertEqual(Field.TYPE, 1)
        self.assertEqual(Field.START, 2)
        self.assertEqual(Field.TYPE.__doc__, 'Char, Date, Logical, etc.')
        self.assertEqual(Field.START.__doc__, 'Field offset in record')
        self.assertFalse(hasattr(Field, '_order_'))

    def test_autovalue_and_init(self):
        class Field(IntEnum, init='value __doc__'):
            TYPE = "Char, Date, Logical, etc."
            START = "Field offset in record"
        self.assertEqual(Field.TYPE, 1)
        self.assertEqual(Field.START.__doc__, 'Field offset in record')

    def test_autonumber_and_start(self):
        class Field(IntEnum, init='__doc__', settings=AddValue, start=0):
            TYPE = "Char, Date, Logical, etc."
            START = "Field offset in record"
        self.assertEqual(Field.TYPE, 0)
        self.assertEqual(Field.START, 1)
        self.assertEqual(Field.TYPE.__doc__, 'Char, Date, Logical, etc.')
        self.assertEqual(Field.START.__doc__, 'Field offset in record')

    def test_autonumber_and_init_and_some_values(self):
        class Field(IntEnum, init='value __doc__'):
            TYPE = "Char, Date, Logical, etc."
            START = "Field offset in record"
            BLAH = 5, "test blah"
            BELCH = 'test belch'
        self.assertEqual(Field.TYPE, 1)
        self.assertEqual(Field.START, 2)
        self.assertEqual(Field.BLAH, 5)
        self.assertEqual(Field.BELCH, 6)
        self.assertEqual(Field.TYPE.__doc__, 'Char, Date, Logical, etc.')
        self.assertEqual(Field.START.__doc__, 'Field offset in record')
        self.assertEqual(Field.BLAH.__doc__, 'test blah')
        self.assertEqual(Field.BELCH.__doc__, 'test belch')

    def test_autonumber_with_irregular_values(self):
        class Point(AutoNumberEnum, init='x y'):
            first = 7, 9
            second = 11, 13
        self.assertEqual(Point.first.value, 1)
        self.assertEqual(Point.first.x, 7)
        self.assertEqual(Point.first.y, 9)
        self.assertEqual(Point.second.value, 2)
        self.assertEqual(Point.second.x, 11)
        self.assertEqual(Point.second.y, 13)
        with self.assertRaisesRegex(TypeError, '.*number of fields provided do not match init ...x., .y.. != .3, 11, 13..'):
            class Point(AutoNumberEnum, init='x y'):
                first = 7, 9
                second = 3, 11, 13
        class Color(AutoNumberEnum, init='__doc__'):
            # interactions between AutoNumberEnum and _generate_next_value_ may not be pretty
            red = ()
            green = 'red'
            blue = ()
        self.assertTrue(Color.red.__doc__, 1)
        self.assertEqual(Color.green.__doc__, 'red')
        self.assertTrue(Color.blue.__doc__, 2)

    def test_autonumber_and_property(self):
        with self.assertRaises(TypeError):
            class Color(AutoEnum):
                _ignore_ = ()
                red = ()
                green = ()
                blue = ()
                @property
                def cap_name(self) -> str:
                    return self.name.title()

    def test_autoenum(self):
        class Color(AutoEnum):
            red
            green
            blue
        self.assertEqual(list(Color), [Color.red, Color.green, Color.blue])
        self.assertEqual([m.value for m in Color], [1, 2, 3])
        self.assertEqual([m.name for m in Color], ['red', 'green', 'blue'])

    def test_autoenum_with_str(self):
        class Color(AutoEnum):
            def _generate_next_value_(name, start, count, last_values):
                return name
            red
            green
            blue
        self.assertEqual(list(Color), [Color.red, Color.green, Color.blue])
        self.assertEqual([m.value for m in Color], ['red', 'green', 'blue'])
        self.assertEqual([m.name for m in Color], ['red', 'green', 'blue'])

    def test_autoenum_and_default_ignore(self):
        class Color(AutoEnum):
            red
            green
            blue
            @property
            def cap_name(self):
                return self.name.title()
        self.assertEqual(Color.blue.cap_name, 'Blue')

    def test_autonumber_and_overridden_ignore(self):
        with self.assertRaises(TypeError):
            class Color(AutoEnum):
                _ignore_ = 'staticmethod'
                red
                green
                blue
                @property
                def cap_name(self) -> str:
                    return self.name.title()

    def test_autonumber_and_multiple_assignment(self):
        class Color(AutoEnum):
            _ignore_ = 'property'
            red
            green
            blue = cyan
            @property
            def cap_name(self) -> str:
                return self.name.title()
        self.assertEqual(Color.blue.cap_name, 'Cyan')

    def test_multivalue_and_autonumber_inherited(self):
        class Measurement(int, Enum, settings=(MultiValue, AddValue), start=0):
            one = "20110721"
            two = "20120911"
            three = "20110518"
        M = Measurement
        self.assertEqual(M.one, 0)
        self.assertTrue(M.one is M(0) is M('20110721'))

    def test_combine_new_settings_with_old_settings(self):
        class Auto(Enum, settings=Unique):
            pass
        with self.assertRaises(ValueError):
            class AutoUnique(Auto, settings=MagicValue):
                BLAH
                BLUH
                ICK = 1

    def test_timedelta(self):
        class Period(timedelta, Enum):
            '''
            different lengths of time
            '''
            _init_ = 'value period'
            _settings_ = NoAlias
            _ignore_ = 'Period i'
            Period = vars()
            for i in range(31):
                Period['day_%d' % i] = i, 'day'
            for i in range(15):
                Period['week_%d' % i] = i*7, 'week'
            for i in range(12):
                Period['month_%d' % i] = i*30, 'month'
            OneDay = day_1
            OneWeek = week_1
        self.assertFalse(hasattr(Period, '_ignore_'))
        self.assertFalse(hasattr(Period, 'Period'))
        self.assertFalse(hasattr(Period, 'i'))
        self.assertTrue(isinstance(Period.day_1, timedelta))

    def test_extend_enum_plain(self):
        class Color(UniqueEnum):
            red = 1
            green = 2
            blue = 3
        extend_enum(Color, 'brown', 4)
        self.assertEqual(Color.brown.name, 'brown')
        self.assertEqual(Color.brown.value, 4)
        self.assertTrue(Color.brown in Color)
        self.assertEqual(len(Color), 4)

    def test_extend_enum_shadow(self):
        class Color(UniqueEnum):
            red = 1
            green = 2
            blue = 3
        extend_enum(Color, 'value', 4)
        self.assertEqual(Color.value.name, 'value')
        self.assertEqual(Color.value.value, 4)
        self.assertTrue(Color.value in Color)
        self.assertEqual(len(Color), 4)
        self.assertEqual(Color.red.value, 1)

    def test_extend_enum_generate(self):
        class Foo(AutoEnum):
            def _generate_next_value_(name, start, count, values, *args, **kwds):
                return name
            a
            b
        #
        extend_enum(Foo, 'c')
        self.assertEqual(Foo.a.value, 'a')
        self.assertEqual(Foo.b.value, 'b')
        self.assertEqual(Foo.c.value, 'c')

    def test_extend_enum_unique_with_duplicate(self):
        with self.assertRaises(ValueError):
            class Color(Enum, settings=Unique):
                red = 1
                green = 2
                blue = 3
            extend_enum(Color, 'value', 1)

    def test_extend_enum_multivalue_with_duplicate(self):
        with self.assertRaises(ValueError):
            class Color(Enum, settings=MultiValue):
                red = 1, 'rojo'
                green = 2, 'verde'
                blue = 3, 'azul'
            extend_enum(Color, 'value', 2)

    def test_extend_enum_noalias_with_duplicate(self):
        class Color(Enum, settings=NoAlias):
            red = 1
            green = 2
            blue = 3
        extend_enum(Color, 'value', 3, )
        self.assertRaises(TypeError, Color, 3)
        self.assertFalse(Color.value is Color.blue)
        self.assertTrue(Color.value.value, 3)

    def test_no_duplicates(self):
        def bad_duplicates():
            class Color(UniqueEnum):
                red = 1
                green = 2
                blue = 3
            class Color(UniqueEnum):
                red = 1
                green = 2
                blue = 3
                grene = 2
        self.assertRaises(ValueError, bad_duplicates)

    def test_no_duplicates_kinda(self):
        class Silly(UniqueEnum):
            one = 1
            two = 'dos'
            name = 3
        class Sillier(IntEnum, UniqueEnum):
            single = 1
            name = 2
            triple = 3
            value = 4

    def test_auto_number(self):
        class Color(Enum, settings=MagicValue):
            red
            blue
            green

        self.assertEqual(list(Color), [Color.red, Color.blue, Color.green])
        self.assertEqual(Color.red.value, 1)
        self.assertEqual(Color.blue.value, 2)
        self.assertEqual(Color.green.value, 3)

    def test_auto_name(self):
        class Color(Enum, settings=MagicValue):
            def _generate_next_value_(name, start, count, last):
                return name
            red
            blue
            green

        self.assertEqual(list(Color), [Color.red, Color.blue, Color.green])
        self.assertEqual(Color.red.value, 'red')
        self.assertEqual(Color.blue.value, 'blue')
        self.assertEqual(Color.green.value, 'green')

    def test_auto_name_inherit(self):
        class AutoNameEnum(Enum):
            def _generate_next_value_(name, start, count, last):
                return name
        class Color(AutoNameEnum, settings=MagicValue):
            red
            blue
            green

        self.assertEqual(list(Color), [Color.red, Color.blue, Color.green])
        self.assertEqual(Color.red.value, 'red')
        self.assertEqual(Color.blue.value, 'blue')
        self.assertEqual(Color.green.value, 'green')

    def test_auto_garbage(self):
        class Color(Enum):
            _settings_ = MagicValue
            red = 'red'
            blue
        self.assertEqual(Color.blue.value, 1)

    def test_auto_garbage_corrected(self):
        class Color(Enum, settings=MagicValue):
            red = 'red'
            blue = 2
            green

        self.assertEqual(list(Color), [Color.red, Color.blue, Color.green])
        self.assertEqual(Color.red.value, 'red')
        self.assertEqual(Color.blue.value, 2)
        self.assertEqual(Color.green.value, 3)

    def test_duplicate_auto(self):
        class Dupes(Enum, settings=MagicValue):
            first = primero
            second
            third
        self.assertEqual([Dupes.first, Dupes.second, Dupes.third], list(Dupes))

    def test_order_as_function(self):
        # first with _init_
        class TestSequence(Enum):
            _init_ = 'value, sequence'
            _order_ = lambda member: member.sequence
            item_id                  = 'An$(1,6)',      0     # Item Code
            company_id               = 'An$(7,2)',      1     # Company Code
            warehouse_no             = 'An$(9,4)',      2     # Warehouse Number
            company                  = 'Hn$(13,6)',     3     # 4 SPACES + COMPANY
            key_type                 = 'Cn$(19,3)',     4     # Key Type = '1**'
            available                = 'Zn$(1,1)',      5     # Available?
            contract_item            = 'Bn(2,1)',       6     # Contract Item?
            sales_category           = 'Fn',            7     # Sales Category
            gl_category              = 'Rn$(5,1)',      8     # G/L Category
            warehouse_category       = 'Sn$(6,1)',      9     # Warehouse Category
            inv_units                = 'Qn$(7,2)',     10     # Inv Units
        for i, member in enumerate(TestSequence):
            self.assertEqual(i, member.sequence)
        ts = TestSequence
        self.assertEqual(ts.item_id.name, 'item_id')
        self.assertEqual(ts.item_id.value, 'An$(1,6)')
        self.assertEqual(ts.item_id.sequence, 0)
        self.assertEqual(ts.company_id.name, 'company_id')
        self.assertEqual(ts.company_id.value, 'An$(7,2)')
        self.assertEqual(ts.company_id.sequence, 1)
        self.assertEqual(ts.warehouse_no.name, 'warehouse_no')
        self.assertEqual(ts.warehouse_no.value, 'An$(9,4)')
        self.assertEqual(ts.warehouse_no.sequence, 2)
        self.assertEqual(ts.company.name, 'company')
        self.assertEqual(ts.company.value, 'Hn$(13,6)')
        self.assertEqual(ts.company.sequence, 3)
        self.assertEqual(ts.key_type.name, 'key_type')
        self.assertEqual(ts.key_type.value, 'Cn$(19,3)')
        self.assertEqual(ts.key_type.sequence, 4)
        self.assertEqual(ts.available.name, 'available')
        self.assertEqual(ts.available.value, 'Zn$(1,1)')
        self.assertEqual(ts.available.sequence, 5)
        self.assertEqual(ts.contract_item.name, 'contract_item')
        self.assertEqual(ts.contract_item.value, 'Bn(2,1)')
        self.assertEqual(ts.contract_item.sequence, 6)
        self.assertEqual(ts.sales_category.name, 'sales_category')
        self.assertEqual(ts.sales_category.value, 'Fn')
        self.assertEqual(ts.sales_category.sequence, 7)
        self.assertEqual(ts.gl_category.name, 'gl_category')
        self.assertEqual(ts.gl_category.value, 'Rn$(5,1)')
        self.assertEqual(ts.gl_category.sequence, 8)
        self.assertEqual(ts.warehouse_category.name, 'warehouse_category')
        self.assertEqual(ts.warehouse_category.value, 'Sn$(6,1)')
        self.assertEqual(ts.warehouse_category.sequence, 9)
        self.assertEqual(ts.inv_units.name, 'inv_units')
        self.assertEqual(ts.inv_units.value, 'Qn$(7,2)')
        self.assertEqual(ts.inv_units.sequence, 10)
        # and then without
        class TestSequence(Enum):
            _order_ = lambda member: member.value[1]
            item_id                  = 'An$(1,6)',      0     # Item Code
            company_id               = 'An$(7,2)',      1     # Company Code
            warehouse_no             = 'An$(9,4)',      2     # Warehouse Number
            company                  = 'Hn$(13,6)',     3     # 4 SPACES + COMPANY
            key_type                 = 'Cn$(19,3)',     4     # Key Type = '1**'
            available                = 'Zn$(1,1)',      5     # Available?
            contract_item            = 'Bn(2,1)',       6     # Contract Item?
            sales_category           = 'Fn',            7     # Sales Category
            gl_category              = 'Rn$(5,1)',      8     # G/L Category
            warehouse_category       = 'Sn$(6,1)',      9     # Warehouse Category
            inv_units                = 'Qn$(7,2)',     10     # Inv Units
        for i, member in enumerate(TestSequence):
            self.assertEqual(i, member.value[1])
        ts = TestSequence
        self.assertEqual(ts.item_id.name, 'item_id')
        self.assertEqual(ts.item_id.value, ('An$(1,6)', 0))
        self.assertEqual(ts.company_id.name, 'company_id')
        self.assertEqual(ts.company_id.value, ('An$(7,2)', 1))
        self.assertEqual(ts.warehouse_no.name, 'warehouse_no')
        self.assertEqual(ts.warehouse_no.value, ('An$(9,4)', 2))
        self.assertEqual(ts.company.name, 'company')
        self.assertEqual(ts.company.value, ('Hn$(13,6)', 3))
        self.assertEqual(ts.key_type.name, 'key_type')
        self.assertEqual(ts.key_type.value, ('Cn$(19,3)', 4))
        self.assertEqual(ts.available.name, 'available')
        self.assertEqual(ts.available.value, ('Zn$(1,1)', 5))
        self.assertEqual(ts.contract_item.name, 'contract_item')
        self.assertEqual(ts.contract_item.value, ('Bn(2,1)', 6))
        self.assertEqual(ts.sales_category.name, 'sales_category')
        self.assertEqual(ts.sales_category.value, ('Fn', 7))
        self.assertEqual(ts.gl_category.name, 'gl_category')
        self.assertEqual(ts.gl_category.value, ('Rn$(5,1)', 8))
        self.assertEqual(ts.warehouse_category.name, 'warehouse_category')
        self.assertEqual(ts.warehouse_category.value, ('Sn$(6,1)', 9))
        self.assertEqual(ts.inv_units.name, 'inv_units')
        self.assertEqual(ts.inv_units.value, ('Qn$(7,2)', 10))
        # then with _init_ but without value
        with self.assertRaises(TypeError):
            class TestSequence(Enum):
                _init_ = 'sequence'
                _order_ = lambda member: member.sequence
                item_id                  = 'An$(1,6)',      0     # Item Code
                company_id               = 'An$(7,2)',      1     # Company Code
                warehouse_no             = 'An$(9,4)',      2     # Warehouse Number
                company                  = 'Hn$(13,6)',     3     # 4 SPACES + COMPANY
                key_type                 = 'Cn$(19,3)',     4     # Key Type = '1**'
                available                = 'Zn$(1,1)',      5     # Available?
                contract_item            = 'Bn(2,1)',       6     # Contract Item?
                sales_category           = 'Fn',            7     # Sales Category
                gl_category              = 'Rn$(5,1)',      8     # G/L Category
                warehouse_category       = 'Sn$(6,1)',      9     # Warehouse Category
                inv_units                = 'Qn$(7,2)',     10     # Inv Units
        # finally, out of order so Python 3 barfs
        with self.assertRaises(TypeError):
            class TestSequence(Enum):
                _init_ = 'sequence'
                _order_ = lambda member: member.sequence
                item_id                  = 'An$(1,6)',      0     # Item Code
                warehouse_no             = 'An$(9,4)',      2     # Warehouse Number
                company                  = 'Hn$(13,6)',     3     # 4 SPACES + COMPANY
                company_id               = 'An$(7,2)',      1     # Company Code
                inv_units                = 'Qn$(7,2)',     10     # Inv Units
                available                = 'Zn$(1,1)',      5     # Available?
                contract_item            = 'Bn(2,1)',       6     # Contract Item?
                sales_category           = 'Fn',            7     # Sales Category
                key_type                 = 'Cn$(19,3)',     4     # Key Type = '1**'
                gl_category              = 'Rn$(5,1)',      8     # G/L Category
                warehouse_category       = 'Sn$(6,1)',      9     # Warehouse Category

    if pyver >= PY3_3:
        def test_missing(self):
            class Color(Enum):
                red = 1
                green = 2
                blue = 3
                @classmethod
                def _missing_(cls, item):
                    if item == 'three':
                        return cls.blue
                    elif item == 'bad return':
                        # trigger internal error
                        return 5
                    elif item == 'error out':
                        raise ZeroDivisionError
                    else:
                        # trigger not found
                        return None
            self.assertIs(Color('three'), Color.blue)
            self.assertRaisesRegex(ValueError, '7 is not a valid Color', Color, 7)
            self.assertRaisesRegex(TypeError, 'error in .*_missing_', Color, 'bad return')
            self.assertRaises(ZeroDivisionError, Color, 'error out')

    def test_enum_of_types(self):
        """Support using Enum to refer to types deliberately."""
        class MyTypes(Enum):
            i = int
            f = float
            s = str
        self.assertEqual(MyTypes.i.value, int)
        self.assertEqual(MyTypes.f.value, float)
        self.assertEqual(MyTypes.s.value, str)
        class Foo:
            pass
        class Bar:
            pass
        class MyTypes2(Enum):
            a = Foo
            b = Bar
        self.assertEqual(MyTypes2.a.value, Foo)
        self.assertEqual(MyTypes2.b.value, Bar)
        class SpamEnumNotInner:
            pass
        class SpamEnum(Enum):
            spam = SpamEnumNotInner
        self.assertEqual(SpamEnum.spam.value, SpamEnumNotInner)

    def test_nested_classes_in_enum_do_not_create_members(self):
        """Support locally-defined nested classes."""
        # manually set __qualname__ to remove testing framework noise
        class Outer(Enum):
            __qualname__ = "Outer"
            a = 1
            b = 2
            class Inner(Enum):
                __qualname__ = "Outer.Inner"
                foo = 10
                bar = 11
        self.assertTrue(isinstance(Outer.Inner, type))
        self.assertEqual(Outer.a.value, 1)
        self.assertEqual(Outer.Inner.foo.value, 10)
        self.assertEqual(
            list(Outer.Inner),
            [Outer.Inner.foo, Outer.Inner.bar],
            )
        self.assertEqual(
            list(Outer),
            [Outer.a, Outer.b],
            )

    if pyver == PY3_4:
        def test_class_nested_enum_and_pickle_protocol_four(self):
            # would normally just have this directly in the class namespace
            class NestedEnum(Enum):
                twigs = 'common'
                shiny = 'rare'

            self.__class__.NestedEnum = NestedEnum
            self.NestedEnum.__qualname__ = '%s.NestedEnum' % self.__class__.__name__
            test_pickle_exception(
                    self.assertRaises, PicklingError, self.NestedEnum.twigs,
                    protocol=(0, 3))
            test_pickle_dump_load(self.assertTrue, self.NestedEnum.twigs,
                    protocol=(4, HIGHEST_PROTOCOL))

    elif pyver >= PY3_5:
        def test_class_nested_enum_and_pickle_protocol_four(self):
            # would normally just have this directly in the class namespace
            class NestedEnum(Enum):
                twigs = 'common'
                shiny = 'rare'

            self.__class__.NestedEnum = NestedEnum
            self.NestedEnum.__qualname__ = '%s.NestedEnum' % self.__class__.__name__
            test_pickle_dump_load(self.assertTrue, self.NestedEnum.twigs,
                    protocol=(0, HIGHEST_PROTOCOL))

    if pyver >= PY3_4:
        def test_enum_injection(self):
            class Color(Enum):
                _order_ = 'BLACK WHITE'
                BLACK = Color('black', '#000')
                WHITE = Color('white', '#fff')

                def __init__(self, label, hex):
                    self.label = label
                    self.hex = hex

            self.assertEqual([Color.BLACK, Color.WHITE], list(Color))
            self.assertEqual(Color.WHITE.hex, '#fff')
            self.assertEqual(Color.BLACK.label, 'black')

        def test_subclasses_with_getnewargs_ex(self):
            class NamedInt(int):
                __qualname__ = 'NamedInt'       # needed for pickle protocol 4
                def __new__(cls, *args):
                    _args = args
                    if len(args) < 2:
                        raise TypeError("name and value must be specified")
                    name, args = args[0], args[1:]
                    self = int.__new__(cls, *args)
                    self._intname = name
                    self._args = _args
                    return self
                def __getnewargs_ex__(self):
                    return self._args, {}
                @property
                def __name__(self):
                    return self._intname
                def __repr__(self):
                    # repr() is updated to include the name and type info
                    return "{}({!r}, {})".format(type(self).__name__,
                                                 self.__name__,
                                                 int.__repr__(self))
                def __str__(self):
                    # str() is unchanged, even if it relies on the repr() fallback
                    base = int
                    base_str = base.__str__
                    if base_str.__objclass__ is object:
                        return base.__repr__(self)
                    return base_str(self)
                # for simplicity, we only define one operator that
                # propagates expressions
                def __add__(self, other):
                    temp = int(self) + int( other)
                    if isinstance(self, NamedInt) and isinstance(other, NamedInt):
                        return NamedInt(
                            '({0} + {1})'.format(self.__name__, other.__name__),
                            temp )
                    else:
                        return temp

            class NEI(NamedInt, Enum):
                __qualname__ = 'NEI'      # needed for pickle protocol 4
                x = ('the-x', 1)
                y = ('the-y', 2)


            self.assertIs(NEI.__new__, Enum.__new__)
            self.assertEqual(repr(NEI.x + NEI.y), "NamedInt('(the-x + the-y)', 3)")
            globals()['NamedInt'] = NamedInt
            globals()['NEI'] = NEI
            NI5 = NamedInt('test', 5)
            self.assertEqual(NI5, 5)
            test_pickle_dump_load(self.assertEqual, NI5, 5, protocol=(4, HIGHEST_PROTOCOL))
            self.assertEqual(NEI.y.value, 2)
            test_pickle_dump_load(self.assertTrue, NEI.y, protocol=(4, HIGHEST_PROTOCOL))

    def test_multiple_superclasses_repr(self):
        class _EnumSuperClass(metaclass=EnumMeta):
            pass
        class E(_EnumSuperClass, Enum):
            A = 1
        self.assertEqual(repr(E.A), "<E.A: 1>")


class TestOrderV3(TestCase):
    """
    Test definition order versus _order_ order.
    """

    def test_same_members(self):
        class Color(Enum):
            _order_ = 'red green blue'
            red = 1
            green = 2
            blue = 3

    def test_same_members_with_aliases(self):
        class Color(Enum):
            _order_ = 'red green blue'
            red = 1
            green = 2
            blue = 3
            verde = green

    def test_same_members_wrong_order(self):
        with self.assertRaisesRegex(TypeError, 'member order does not match _order_'):
            class Color(Enum):
                _order_ = 'red green blue'
                red = 1
                blue = 3
                green = 2

    def test_order_has_extra_members(self):
        with self.assertRaisesRegex(TypeError, 'member order does not match _order_'):
            class Color(Enum):
                _order_ = 'red green blue purple'
                red = 1
                green = 2
                blue = 3

    def test_order_has_extra_members_with_aliases(self):
        with self.assertRaisesRegex(TypeError, 'member order does not match _order_'):
            class Color(Enum):
                _order_ = 'red green blue purple'
                red = 1
                green = 2
                blue = 3
                verde = green

    def test_enum_has_extra_members(self):
        with self.assertRaisesRegex(TypeError, 'member order does not match _order_'):
            class Color(Enum):
                _order_ = 'red green blue'
                red = 1
                green = 2
                blue = 3
                purple = 4

    def test_enum_has_extra_members_with_aliases(self):
        with self.assertRaisesRegex(TypeError, 'member order does not match _order_'):
            class Color(Enum):
                _order_ = 'red green blue'
                red = 1
                green = 2
                blue = 3
                purple = 4
                verde = green

    def test_same_members_flag(self):
        class Color(Flag):
            _order_ = 'red green blue'
            red = 1
            green = 2
            blue = 4

    def test_same_members_with_aliases_flag(self):
        class Color(Flag):
            _order_ = 'red green blue'
            red = 1
            green = 2
            blue = 4
            verde = green

    def test_same_members_wrong_order_falg(self):
        with self.assertRaisesRegex(TypeError, 'member order does not match _order_'):
            class Color(Flag):
                _order_ = 'red green blue'
                red = 1
                blue = 4
                green = 2

    def test_order_has_extra_members_flag(self):
        with self.assertRaisesRegex(TypeError, 'member order does not match _order_'):
            class Color(Flag):
                _order_ = 'red green blue purple'
                red = 1
                green = 2
                blue = 4

    def test_order_has_extra_members_with_aliases_flag(self):
        with self.assertRaisesRegex(TypeError, 'member order does not match _order_'):
            class Color(Flag):
                _order_ = 'red green blue purple'
                red = 1
                green = 2
                blue = 4
                verde = green

    def test_enum_has_extra_members_flag(self):
        with self.assertRaisesRegex(TypeError, 'member order does not match _order_'):
            class Color(Flag):
                _order_ = 'red green blue'
                red = 1
                green = 2
                blue = 4
                purple = 8

    def test_enum_has_extra_members_with_aliases_flag(self):
        with self.assertRaisesRegex(TypeError, 'member order does not match _order_'):
            class Color(Flag):
                _order_ = 'red green blue'
                red = 1
                green = 2
                blue = 4
                purple = 8
                verde = green


class TestNamedTupleV3(TestCase):

    def test_fixed_size(self):
        class Book(NamedTuple, size=TupleSize.fixed):
            title = 0
            author = 1
            genre = 2
        b = Book('Teckla', 'Steven Brust', 'fantasy')
        self.assertTrue('Teckla' in b)
        self.assertTrue('Steven Brust' in b)
        self.assertTrue('fantasy' in b)
        self.assertEqual(b.title, 'Teckla')
        self.assertEqual(b.author, 'Steven Brust')
        self.assertRaises(TypeError, Book, 'Teckla', 'Steven Brust')
        self.assertRaises(TypeError, Book, 'Teckla')

    def test_minimum_size(self):
        class Book(NamedTuple, size=TupleSize.minimum):
            title = 0
            author = 1
        b = Book('Teckla', 'Steven Brust', 'fantasy')
        self.assertTrue('Teckla' in b)
        self.assertTrue('Steven Brust' in b)
        self.assertTrue('fantasy' in b)
        self.assertEqual(b.title, 'Teckla')
        self.assertEqual(b.author, 'Steven Brust')
        self.assertEqual(b[2], 'fantasy')
        b = Book('Teckla', 'Steven Brust')
        self.assertTrue('Teckla' in b)
        self.assertTrue('Steven Brust' in b)
        self.assertEqual(b.title, 'Teckla')
        self.assertEqual(b.author, 'Steven Brust')
        self.assertRaises(TypeError, Book, 'Teckla')

    def test_variable_size(self):
        class Book(NamedTuple, size=TupleSize.variable):
            title = 0
            author = 1
            genre = 2
        b = Book('Teckla', 'Steven Brust', 'fantasy')
        self.assertTrue('Teckla' in b)
        self.assertTrue('Steven Brust' in b)
        self.assertTrue('fantasy' in b)
        self.assertEqual(b.title, 'Teckla')
        self.assertEqual(b.author, 'Steven Brust')
        self.assertEqual(b.genre, 'fantasy')
        b = Book('Teckla', 'Steven Brust')
        self.assertTrue('Teckla' in b)
        self.assertTrue('Steven Brust' in b)
        self.assertEqual(b.title, 'Teckla')
        self.assertEqual(b.author, 'Steven Brust')
        self.assertRaises(AttributeError, getattr, b, 'genre')
        self.assertRaises(TypeError, Book, title='Teckla', genre='fantasy')
        self.assertRaises(TypeError, Book, author='Steven Brust')



class TestStackoverflowAnswersV3(TestCase):

    def test_self_referential_directions(self):
        # https://stackoverflow.com/a/64000706/208880
        class Directions(Enum):
            #
            NORTH = 1, 0
            WEST = 0, 1
            SOUTH = -1, 0
            EAST = 0, -1
            #
            def __init__(self, x, y):
                self.x = x
                self.y = y
                if len(self.__class__):
                    # make links
                    all = list(self.__class__)
                    left, right = all[0], all[-1]
                    self.left = left
                    self.right = right
                    left.right = self
                    right.left = self
        #
        D = Directions
        self.assertEqual(D.NORTH.value, (1, 0))
        self.assertTrue(D.NORTH.left is D.WEST)
        self.assertTrue(D.SOUTH.right is D.WEST)

    def test_self_referential_rock_paper_scissors(self):
        # https://stackoverflow.com/a/57085357/208880
        class RPS(Enum):
            #
            Rock = "rock"
            Paper = "paper"
            Scissors = "scissors"
            #
            def __init__(self, value):
                if len(self.__class__):
                    # make links
                    all = list(self.__class__)
                    first, previous = all[0], all[-1]
                    first.beats = self
                    self.beats = previous
        #
        self.assertTrue(RPS.Rock.beats is RPS.Scissors)
        self.assertTrue(RPS.Scissors.beats is RPS.Paper)
        self.assertTrue(RPS.Paper.beats is RPS.Rock)

    def test_arduino_headers(self):
        # https://stackoverflow.com/q/65048495/208880
        class CHeader(Enum):
            def __init_subclass__(cls, **kwds):
                # write Enums to C header file
                cls_name = cls.__name__
                header_path = getattr(cls, '_%s__header' % cls_name)
                with open(header_path, 'w') as fh:
                    fh.write('initial header stuff here\n')
                    for enum in cls:
                        fh.write('#define %s %r\n' % (enum.name, enum.value))
        class Arduino(CHeader):
            __header = os.path.join(tempdir, 'arduino.h')
            ONE = 1
            TWO = 2
        with open(os.path.join(tempdir, 'arduino.h')) as fh:
                data = fh.read()
        self.assertEqual(textwrap.dedent("""\
                initial header stuff here
                #define ONE 1
                #define TWO 2
                """),
                data,
                )

    def test_create_C_like_Enum(self):
        # https://stackoverflow.com/a/35965438/208880
        class Id(Enum, settings=MagicValue, start=0):
            #
            NONE  # 0x0
            HEARTBEAT  # 0x1
            FLUID_TRANSFER_REQUEST
            FLUID_TRANSFER_STATUS_MSG
            FLUID_TRANSFER_ERROR_MSG
            # ...
            #
            # Camera App Messages
            START_SENDING_PICTURES = 0x010000
            STOP_SENDING_PICTURES
            START_RECORDING_VIDEO_REQ
            STOP_RECORDING_VIDEO_REQ
            # ...
            #
            # Sensor Calibration
            VOLUME_REQUEST = 0x020000
            START_CAL
            CLI_COMMAND_REQUEST
            CLI_COMMAND_RESPONSE
            #
            # File Mananger
            NEW_DELIVERY_REQ = 0x30000
            GET_DELIVERY_FILE_REQ
            GET_FILE_REQ
            #
            ACK_NACK
            RESPONSE
            #
            LAST_ID
        #
        self.assertEqual(Id.NONE.value, 0)
        self.assertEqual(Id.FLUID_TRANSFER_ERROR_MSG.value, 4)
        self.assertEqual(Id.START_SENDING_PICTURES.value, 0x010000)
        self.assertEqual(Id.STOP_RECORDING_VIDEO_REQ.value, 0x010003)
        self.assertEqual(Id.START_CAL.value, 0x020001)
        self.assertEqual(Id.LAST_ID.value, 0x30005)


    @unittest.skipUnless(pyparsing, 'pyparsing not installed')
    def test_c_header_scanner(self):
        # https://stackoverflow.com/questions/58732872/208880
        with open(os.path.join(tempdir, 'c_plus_plus.h'), 'w') as fh:
            fh.write("""
                    stuff before
                    enum hello {
                        Zero,
                        One,
                        Two,
                        Three,
                        Five=5,
                        Six,
                        Ten=10
                        };
                    in the middle
                    enum blah
                        {
                        alpha,
                        beta,
                        gamma = 10 ,
                        zeta = 50
                        };
                    at the end
                    """)
        from pyparsing import Group, Optional, Suppress, Word, ZeroOrMore
        from pyparsing import alphas, alphanums, nums
        #
        CPPEnum = None
        class CPPEnumType(EnumMeta):
            #
            @classmethod
            def __prepare__(metacls, clsname, bases, **kwds):
                # return a standard dictionary for the initial processing
                return {}
            #
            def __init__(clsname, *args , **kwds):
                super(CPPEnumType, clsname).__init__(*args)
            #
            def __new__(metacls, clsname, bases, clsdict, **kwds):
                if CPPEnum is None:
                    # first time through, ignore the rest
                    enum_dict = super(CPPEnumType, metacls).__prepare__(clsname, bases, **kwds)
                    enum_dict.update(clsdict)
                    return super(CPPEnumType, metacls).__new__(metacls, clsname, bases, enum_dict, **kwds)
                members = []
                #
                # remove _file and _name using `pop()` as they will cause problems in EnumMeta
                try:
                    file = clsdict.pop('_file')
                except KeyError:
                    raise TypeError('_file not specified')
                cpp_enum_name = clsdict.pop('_name', clsname.lower())
                with open(file) as fh:
                    file_contents = fh.read()
                #
                # syntax we don't want to see in the final parse tree
                LBRACE, RBRACE, EQ, COMMA = map(Suppress, "{}=,")
                _enum = Suppress("enum")
                identifier = Word(alphas, alphanums + "_")
                integer = Word(nums)
                enumValue = Group(identifier("name") + Optional(EQ + integer("value")))
                enumList = Group(enumValue + ZeroOrMore(COMMA + enumValue))
                enum = _enum + identifier("enum") + LBRACE + enumList("names") + RBRACE
                #
                # find the cpp_enum_name ignoring other syntax and other enums
                for item, start, stop in enum.scanString(file_contents):
                    if item.enum != cpp_enum_name:
                        continue
                    id = 0
                    for entry in item.names:
                        if entry.value != "":
                            id = int(entry.value)
                        members.append((entry.name.upper(), id))
                        id += 1
                #
                # get the real EnumDict
                enum_dict = super(CPPEnumType, metacls).__prepare__(clsname, bases, **kwds)
                # transfer the original dict content, names starting with '_' first
                items = list(clsdict.items())
                items.sort(key=lambda p: (0 if p[0][0] == '_' else 1, p))
                for name, value in items:
                    enum_dict[name] = value
                # add the members
                for name, value in members:
                    enum_dict[name] = value
                return super(CPPEnumType, metacls).__new__(metacls, clsname, bases, enum_dict, **kwds)
        #
        class CPPEnum(IntEnum, metaclass=CPPEnumType):
            pass
        #
        class Hello(CPPEnum):
            _file = os.path.join(tempdir, 'c_plus_plus.h')
        #
        class Blah(CPPEnum):
            _file = os.path.join(tempdir, 'c_plus_plus.h')
            _name = 'blah'
        #
        self.assertEqual(
                list(Hello),
                [Hello.ZERO, Hello.ONE, Hello.TWO, Hello.THREE, Hello.FIVE, Hello.SIX, Hello.TEN],
                )
        self.assertEqual(Hello.ZERO.value, 0)
        self.assertEqual(Hello.THREE.value, 3)
        self.assertEqual(Hello.SIX.value, 6)
        self.assertEqual(Hello.TEN.value, 10)
        #
        self.assertEqual(
                list(Blah),
                [Blah.ALPHA, Blah.BETA, Blah.GAMMA, Blah.ZETA],
                )
        self.assertEqual(Blah.ALPHA.value, 0)
        self.assertEqual(Blah.BETA.value, 1)
        self.assertEqual(Blah.GAMMA.value, 10)
        self.assertEqual(Blah.ZETA.value, 50)

class TestIssuesV3(TestCase):
    """
    Problems that were stated in issues.
    """

    def test_auto_multi_int_1(self):
        class Measurement(int, AddValueEnum, MultiValueEnum, start=0):
            one = "20110721"
            two = "20120911"
            three = "20110518"
        self.assertEqual([m.value for m in Measurement], [0, 1, 2])
        self.assertEqual([m.name for m in Measurement], ['one', 'two', 'three'])
        self.assertIs(Measurement(0), Measurement.one)
        self.assertIs(Measurement('20110721'), Measurement.one)
        self.assertIs(Measurement(1), Measurement.two)
        self.assertIs(Measurement('20120911'), Measurement.two)
        self.assertIs(Measurement(2), Measurement.three)
        self.assertIs(Measurement('20110518'), Measurement.three)

    def test_auto_multi_int_2(self):
        class Measurement(int, Enum, settings=(MultiValue, AddValue), start=0):
            one = "20110721"
            two = "20120911"
            three = "20110518"
        self.assertEqual([m.value for m in Measurement], [0, 1, 2])
        self.assertEqual([m.name for m in Measurement], ['one', 'two', 'three'])
        self.assertIs(Measurement(0), Measurement.one)
        self.assertIs(Measurement('20110721'), Measurement.one)
        self.assertIs(Measurement(1), Measurement.two)
        self.assertIs(Measurement('20120911'), Measurement.two)
        self.assertIs(Measurement(2), Measurement.three)
        self.assertIs(Measurement('20110518'), Measurement.three)

    def test_extend_enum_with_init(self):
        class Color(Enum, settings=MultiValue, init='foo bar'):
            red = '1', 'yes'
            green = '2', 'no'
            blue = '3', 'maybe'
        self.assertEqual(Color.red.value, '1')
        self.assertEqual(Color.red.foo, '1')
        self.assertEqual(Color.red.bar, 'yes')
        extend_enum(Color, 'opacity', '4', 'never')
        self.assertEqual(list(Color), [Color.red, Color.green, Color.blue, Color.opacity])
        self.assertEqual(Color.opacity.value, '4')
        self.assertEqual(Color.opacity.name, 'opacity')
        self.assertTrue(Color('4') is Color.opacity)
        self.assertTrue(Color('never') is Color.opacity)

class TestExtendEnumV3(TestCase):

    def test_extend_enum_plain(self):
        class Color(Enum):
            red = 1
            green = 2
            blue = 3
        self.assertRaisesRegex(TypeError, '.blue. already in use as .Color.blue: 3.', extend_enum, Color, 'blue', 5)
        #
        extend_enum(Color, 'brown', 4)
        self.assertEqual(Color.brown.name, 'brown')
        self.assertEqual(Color.brown.value, 4)
        self.assertTrue(Color.brown in Color)
        self.assertEqual(Color(4), Color.brown)
        self.assertEqual(Color['brown'], Color.brown)
        self.assertEqual(len(Color), 4)
        #
        extend_enum(Color, 'mauve')
        self.assertEqual(Color.mauve.name, 'mauve')
        self.assertEqual(Color.mauve.value, 5)
        self.assertTrue(Color.mauve in Color)
        self.assertEqual(Color(5), Color.mauve)
        self.assertEqual(Color['mauve'], Color.mauve)
        self.assertEqual(len(Color), 5)

    def test_extend_enum_alias(self):
        class Color(Enum):
            red = 1
            green = 2
            blue = 3
        extend_enum(Color, 'rojo', 1)
        self.assertEqual(Color.rojo.name, 'red')
        self.assertEqual(Color.rojo.value, 1)
        self.assertTrue(Color.rojo in Color)
        self.assertEqual(Color(1), Color.rojo)
        self.assertEqual(Color['rojo'], Color.red)
        self.assertEqual(len(Color), 3)

    def test_extend_enum_unique(self):
        class Color(UniqueEnum):
            red = 1
            green = 2
            blue = 3
        self.assertRaisesRegex(ValueError, r'<Color.rojo: 1> is a duplicate of <Color.red: 1>', extend_enum, Color, 'rojo', 1)
        #
        self.assertEqual(Color.red.name, 'red')
        self.assertEqual(Color.red.value, 1)
        self.assertTrue(Color.red in Color)
        self.assertEqual(Color(1), Color.red)
        self.assertEqual(Color['red'], Color.red)
        self.assertEqual(Color.green.name, 'green')
        self.assertEqual(Color.green.value, 2)
        self.assertTrue(Color.green in Color)
        self.assertEqual(Color(2), Color.green)
        self.assertEqual(Color['blue'], Color.blue)
        self.assertEqual(Color.blue.name, 'blue')
        self.assertEqual(Color.blue.value, 3)
        self.assertTrue(Color.blue in Color)
        self.assertEqual(Color(3), Color.blue)
        self.assertEqual(len(Color), 3)
        #
        extend_enum(Color, 'brown', 4)
        self.assertEqual(Color.brown.name, 'brown')
        self.assertEqual(Color.brown.value, 4)
        self.assertTrue(Color.brown in Color)
        self.assertEqual(Color(4), Color.brown)
        self.assertEqual(Color['brown'], Color.brown)
        self.assertEqual(len(Color), 4)
        #
        self.assertRaisesRegex(ValueError, '<Color.verde: 2> is a duplicate of <Color.green: 2>', extend_enum, Color, 'verde', 2)
        #
        extend_enum(Color, 'mauve')
        self.assertEqual(Color.mauve.name, 'mauve')
        self.assertEqual(Color.mauve.value, 5)
        self.assertTrue(Color.mauve in Color)
        self.assertEqual(Color(5), Color.mauve)
        self.assertEqual(Color['mauve'], Color.mauve)
        self.assertEqual(len(Color), 5)


    def test_extend_enum_shadow_property(self):
        class Color(Enum):
            red = 1
            green = 2
            blue = 3
        extend_enum(Color, 'value', 4)
        self.assertEqual(Color.value.name, 'value')
        self.assertEqual(Color.value.value, 4)
        self.assertTrue(Color.value in Color)
        self.assertEqual(Color(4), Color.value)
        self.assertEqual(Color['value'], Color.value)
        self.assertEqual(len(Color), 4)
        self.assertEqual(Color.red.value, 1)

    def test_extend_enum_shadow_base(self):
        class hohum(object):
            def cyan(self):
                "cyanize a color"
                return self.value
        class Color(hohum, Enum):
            red = 1
            green = 2
            blue = 3
        self.assertRaisesRegex(TypeError, r'already in use in superclass', extend_enum, Color, 'cyan', 4)
        self.assertEqual(len(Color), 3)
        self.assertEqual(list(Color), [Color.red, Color.green, Color.blue])

    def test_extend_enum_multivalue(self):
        class Color(MultiValueEnum):
            red = 1, 4, 7
            green = 2, 5, 8
            blue = 3, 6, 9
        extend_enum(Color, 'brown', 10, 20)
        self.assertEqual(Color.brown.name, 'brown')
        self.assertEqual(Color.brown.value, 10)
        self.assertTrue(Color.brown in Color)
        self.assertEqual(Color(10), Color.brown)
        self.assertEqual(Color(20), Color.brown)
        self.assertEqual(Color['brown'], Color.brown)
        self.assertEqual(len(Color), 4)
        #
        self.assertRaisesRegex(ValueError, 'no values specified for MultiValue enum', extend_enum, Color, 'mauve')

    def test_extend_enum_multivalue_alias(self):
        class Color(MultiValueEnum):
            red = 1, 4, 7
            green = 2, 5, 8
            blue = 3, 6, 9
        self.assertRaisesRegex(ValueError, r'<Color.rojo: 7> is a duplicate of <Color.red: 1>', extend_enum, Color, 'rojo', 7)
        self.assertEqual(Color.red.name, 'red')
        self.assertEqual(Color.red.value, 1)
        self.assertTrue(Color.red in Color)
        self.assertEqual(Color(1), Color.red)
        self.assertEqual(Color(4), Color.red)
        self.assertEqual(Color(7), Color.red)
        self.assertEqual(Color['red'], Color.red)
        self.assertEqual(Color.green.name, 'green')
        self.assertEqual(Color.green.value, 2)
        self.assertTrue(Color.green in Color)
        self.assertEqual(Color(2), Color.green)
        self.assertEqual(Color(5), Color.green)
        self.assertEqual(Color(8), Color.green)
        self.assertEqual(Color['blue'], Color.blue)
        self.assertEqual(Color.blue.name, 'blue')
        self.assertEqual(Color.blue.value, 3)
        self.assertTrue(Color.blue in Color)
        self.assertEqual(Color(3), Color.blue)
        self.assertEqual(Color(6), Color.blue)
        self.assertEqual(Color(9), Color.blue)
        self.assertEqual(len(Color), 3)

    def test_extend_enum_multivalue_str(self):
        class M(str, MultiValueEnum):
            VALUE_1 = 'value_1', 'VALUE_1'
            VALUE_2 = 'value_2', 'VALUE_2'
            VALUE_3 = 'value_3', 'VALUE_3'
        self.assertTrue(M._member_type_ is str)
        extend_enum(M, 'VALUE_4', 'value_4', 'VALUE_4')
        self.assertEqual(list(M), [M.VALUE_1, M.VALUE_2, M.VALUE_3, M.VALUE_4])
        self.assertTrue(M('value_4') is M.VALUE_4)
        self.assertTrue(M('VALUE_4') is M.VALUE_4)
        self.assertTrue(M.VALUE_4.name == 'VALUE_4')
        self.assertTrue(M.VALUE_4.value == 'value_4')

    def test_extend_intenum(self):
        class Index(IntEnum):
            DeviceType    = 0x1000
            ErrorRegister = 0x1001

        for name, value in (
                ('ControlWord', 0x6040),
                ('StatusWord', 0x6041),
                ('OperationMode', 0x6060),
                ):
            extend_enum(Index, name, value)

        self.assertEqual(len(Index), 5)
        self.assertEqual(list(Index), [Index.DeviceType, Index.ErrorRegister, Index.ControlWord, Index.StatusWord, Index.OperationMode])
        self.assertEqual(Index.DeviceType.value, 0x1000)
        self.assertEqual(Index.StatusWord.value, 0x6041)

    def test_extend_multi_init(self):
        class HTTPStatus(IntEnum):
            def __new__(cls, value, phrase, description):
                obj = int.__new__(cls, value)
                obj._value_ = value

                obj.phrase = phrase
                obj.description = description
                return obj
            CONTINUE = 100, 'Continue', 'Request received, please continue'
            SWITCHING_PROTOCOLS = 101, 'Switching Protocols', 'Switching to new protocol; obey Upgrade header'
            PROCESSING = 102, 'Processing', ''
        length = 3
        extend_enum(HTTPStatus, 'BAD_SPAM', 513, 'Too greasy', 'for a train')
        extend_enum(HTTPStatus, 'BAD_EGGS', 514, 'Too green', '')
        self.assertEqual(len(HTTPStatus), length+2)
        self.assertEqual(
                list(HTTPStatus)[-2:],
                [HTTPStatus.BAD_SPAM, HTTPStatus.BAD_EGGS],
                )
        self.assertEqual(HTTPStatus.BAD_SPAM.value, 513)
        self.assertEqual(HTTPStatus.BAD_SPAM.name, 'BAD_SPAM')
        self.assertEqual(HTTPStatus.BAD_SPAM.phrase, 'Too greasy')
        self.assertEqual(HTTPStatus.BAD_SPAM.description, 'for a train')
        self.assertEqual(HTTPStatus.BAD_EGGS.value, 514)
        self.assertEqual(HTTPStatus.BAD_EGGS.name, 'BAD_EGGS')
        self.assertEqual(HTTPStatus.BAD_EGGS.phrase, 'Too green')
        self.assertEqual(HTTPStatus.BAD_EGGS.description, '')

    def test_extend_flag(self):
        class Color(Flag):
            BLACK = 0
            RED = 1
            GREEN = 2
            BLUE = 4
        extend_enum(Color, 'MAGENTA')
        self.assertTrue(Color(8) is Color.MAGENTA)
        self.assertTrue(isinstance(Color.MAGENTA, Color))
        self.assertEqual(Color.MAGENTA.value, 8)
        extend_enum(Color, 'PURPLE', 11)
        self.assertTrue(Color(11) is Color.PURPLE)
        self.assertTrue(isinstance(Color.PURPLE, Color))
        self.assertEqual(Color.PURPLE.value, 11)
        self.assertTrue(issubclass(Color, Flag))

    def test_extend_flag_backwards(self):
        class Color(Flag):
            BLACK = 0
            RED = 1
            GREEN = 2
            BLUE = 4
        extend_enum(Color, 'PURPLE', 11)
        self.assertTrue(Color(11) is Color.PURPLE)
        self.assertTrue(isinstance(Color.PURPLE, Color))
        self.assertEqual(Color.PURPLE.value, 11)
        self.assertTrue(issubclass(Color, Flag))
        #
        extend_enum(Color, 'MAGENTA')
        self.assertTrue(Color(8) is Color.MAGENTA)
        self.assertTrue(isinstance(Color.MAGENTA, Color))
        self.assertEqual(Color.MAGENTA.value, 8)
        #
        extend_enum(Color, 'mauve')
        self.assertEqual(Color.mauve.name, 'mauve')
        self.assertEqual(Color.mauve.value, 16)
        self.assertTrue(Color.mauve in Color)
        self.assertEqual(Color(16), Color.mauve)
        self.assertEqual(Color['mauve'], Color.mauve)
        self.assertEqual(len(Color), 5)

    def test_extend_intflag(self):
        class Color(IntFlag):
            BLACK = 0
            RED = 1
            GREEN = 2
            BLUE = 4
        extend_enum(Color, 'MAGENTA')
        self.assertTrue(Color(8) is Color.MAGENTA)
        self.assertTrue(isinstance(Color.MAGENTA, Color))
        self.assertEqual(Color.MAGENTA.value, 8)
        extend_enum(Color, 'PURPLE', 11)
        self.assertTrue(Color(11) is Color.PURPLE)
        self.assertTrue(isinstance(Color.PURPLE, Color))
        self.assertEqual(Color.PURPLE.value, 11)
        self.assertTrue(issubclass(Color, Flag))
        #
        extend_enum(Color, 'mauve')
        self.assertEqual(Color.mauve.name, 'mauve')
        self.assertEqual(Color.mauve.value, 16)
        self.assertTrue(Color.mauve in Color)
        self.assertEqual(Color(16), Color.mauve)
        self.assertEqual(Color['mauve'], Color.mauve)
        self.assertEqual(len(Color), 5)

    def test_extend_intflag_backwards(self):
        class Color(IntFlag):
            BLACK = 0
            RED = 1
            GREEN = 2
            BLUE = 4
        extend_enum(Color, 'PURPLE', 11)
        self.assertTrue(Color(11) is Color.PURPLE)
        self.assertTrue(isinstance(Color.PURPLE, Color))
        self.assertEqual(Color.PURPLE.value, 11)
        self.assertTrue(issubclass(Color, Flag))
        #
        extend_enum(Color, 'MAGENTA')
        self.assertTrue(Color(8) is Color.MAGENTA)
        self.assertTrue(isinstance(Color.MAGENTA, Color))
        self.assertEqual(Color.MAGENTA.value, 8)
        #
        extend_enum(Color, 'mauve')
        self.assertEqual(Color.mauve.name, 'mauve')
        self.assertEqual(Color.mauve.value, 16)
        self.assertTrue(Color.mauve in Color)
        self.assertEqual(Color(16), Color.mauve)
        self.assertEqual(Color['mauve'], Color.mauve)
        self.assertEqual(len(Color), 5)

    def test_extend_strenum(self):
        class Color(StrEnum):
            RED = auto()
            GREEN = auto()
            BLUE = auto()
        extend_enum(Color, 'BLACK')
        self.assertEqual(Color.BLACK.name, 'BLACK')
        self.assertEqual(Color.BLACK.value, 'black')
        self.assertEqual(len(Color), 4)

    @unittest.skipUnless(StdlibEnum, 'Stdlib Enum not available')
    def test_extend_enum_stdlib(self):
        class Color(StdlibEnum):
            red = 1
            green = 2
            blue = 3
        self.assertEqual(getattr(Color.red, '_values_', None), None)
        extend_enum(Color, 'brown', 4)
        self.assertEqual(Color.brown.name, 'brown')
        self.assertEqual(Color.brown.value, 4)
        self.assertTrue(Color.brown in Color)
        self.assertEqual(Color(4), Color.brown)
        self.assertEqual(Color['brown'], Color.brown)
        self.assertEqual(len(Color), 4)

    @unittest.skipUnless(StdlibEnum, 'Stdlib Enum not available')
    def test_extend_enum_plain_stdlib(self):
        class Color(StdlibEnum):
            red = 1
            green = 2
            blue = 3
        self.assertRaisesRegex(TypeError, 'already in use as', extend_enum, Color, 'blue', 5)
        #
        extend_enum(Color, 'brown', 4)
        self.assertEqual(Color.brown.name, 'brown')
        self.assertEqual(Color.brown.value, 4)
        self.assertTrue(Color.brown in Color)
        self.assertEqual(Color(4), Color.brown)
        self.assertEqual(Color['brown'], Color.brown)
        self.assertEqual(len(Color), 4)
        self.assertEqual(list(Color), [Color.red, Color.green, Color.blue, Color.brown])
        self.assertEqual([c.value for c in Color], [1, 2, 3, 4])
        #
        extend_enum(Color, 'mauve')
        self.assertEqual(Color.mauve.name, 'mauve')
        self.assertEqual(Color.mauve.value, 5)
        self.assertTrue(Color.mauve in Color)
        self.assertEqual(Color(5), Color.mauve)
        self.assertEqual(Color['mauve'], Color.mauve)
        self.assertEqual(len(Color), 5)

    @unittest.skipUnless(StdlibEnum, 'Stdlib Enum not available')
    def test_extend_enum_alias_stdlib(self):
        class Color(StdlibEnum):
            red = 1
            green = 2
            blue = 3
        extend_enum(Color, 'rojo', 1)
        self.assertEqual(Color.rojo.name, 'red')
        self.assertEqual(Color.rojo.value, 1)
        self.assertTrue(Color.rojo in Color)
        self.assertEqual(Color(1), Color.rojo)
        self.assertEqual(Color['rojo'], Color.red)
        self.assertEqual(len(Color), 3)

    @unittest.skipUnless(StdlibEnum, 'Stdlib Enum not available')
    def test_extend_enum_shadow_property_stdlib(self):
        class Color(StdlibEnum):
            red = 1
            green = 2
            blue = 3
        extend_enum(Color, 'value', 4)
        self.assertEqual(Color.value.name, 'value')
        self.assertEqual(Color.value.value, 4)
        self.assertTrue(Color.value in Color)
        self.assertEqual(Color(4), Color.value)
        self.assertEqual(Color['value'], Color.value)
        self.assertEqual(len(Color), 4)
        self.assertEqual(Color.red.value, 1)

    @unittest.skipUnless(StdlibEnum, 'Stdlib Enum not available')
    def test_extend_enum_shadow_base_stdlib(self):
        class hohum(object):
            def cyan(self):
                "cyanize a color"
                return self.value
        class Color(hohum, StdlibEnum):
            red = 1
            green = 2
            blue = 3
        self.assertRaisesRegex(TypeError, r'already in use in superclass', extend_enum, Color, 'cyan', 4)
        self.assertEqual(len(Color), 3)
        self.assertEqual(list(Color), [Color.red, Color.green, Color.blue])

    @unittest.skipUnless(StdlibIntEnum, 'Stdlib IntEnum not available')
    def test_extend_intenum_stdlib(self):
        class Index(StdlibIntEnum):
            DeviceType    = 0x1000
            ErrorRegister = 0x1001

        for name, value in (
                ('ControlWord', 0x6040),
                ('StatusWord', 0x6041),
                ('OperationMode', 0x6060),
                ):
            extend_enum(Index, name, value)

        self.assertEqual(len(Index), 5)
        self.assertEqual(list(Index), [Index.DeviceType, Index.ErrorRegister, Index.ControlWord, Index.StatusWord, Index.OperationMode])
        self.assertEqual(Index.DeviceType.value, 0x1000)
        self.assertEqual(Index.StatusWord.value, 0x6041)

    @unittest.skipUnless(StdlibIntEnum, 'Stdlib IntEnum not available')
    def test_extend_multi_init_stdlib(self):
        class HTTPStatus(StdlibIntEnum):
            def __new__(cls, value, phrase, description):
                obj = int.__new__(cls, value)
                obj._value_ = value

                obj.phrase = phrase
                obj.description = description
                return obj
            CONTINUE = 100, 'Continue', 'Request received, please continue'
            SWITCHING_PROTOCOLS = 101, 'Switching Protocols', 'Switching to new protocol; obey Upgrade header'
            PROCESSING = 102, 'Processing', ''
        length = 3
        extend_enum(HTTPStatus, 'BAD_SPAM', 513, 'Too greasy', 'for a train')
        extend_enum(HTTPStatus, 'BAD_EGGS', 514, 'Too green', '')
        self.assertEqual(len(HTTPStatus), length+2)
        self.assertEqual(
                list(HTTPStatus)[-2:],
                [HTTPStatus.BAD_SPAM, HTTPStatus.BAD_EGGS],
                )
        self.assertEqual(HTTPStatus.BAD_SPAM.value, 513)
        self.assertEqual(HTTPStatus.BAD_SPAM.name, 'BAD_SPAM')
        self.assertEqual(HTTPStatus.BAD_SPAM.phrase, 'Too greasy')
        self.assertEqual(HTTPStatus.BAD_SPAM.description, 'for a train')
        self.assertEqual(HTTPStatus.BAD_EGGS.value, 514)
        self.assertEqual(HTTPStatus.BAD_EGGS.name, 'BAD_EGGS')
        self.assertEqual(HTTPStatus.BAD_EGGS.phrase, 'Too green')
        self.assertEqual(HTTPStatus.BAD_EGGS.description, '')

    @unittest.skipUnless(StdlibFlag, 'Stdlib Flag not available')
    def test_extend_flag_stdlib(self):
        class Color(StdlibFlag):
            BLACK = 0
            RED = 1
            GREEN = 2
            BLUE = 4
        extend_enum(Color, 'MAGENTA')
        self.assertTrue(Color(8) is Color.MAGENTA)
        self.assertTrue(isinstance(Color.MAGENTA, Color))
        self.assertEqual(Color.MAGENTA.value, 8)
        extend_enum(Color, 'PURPLE', 11)
        self.assertTrue(Color(11) is Color.PURPLE)
        self.assertTrue(isinstance(Color.PURPLE, Color))
        self.assertEqual(Color.PURPLE.value, 11)
        self.assertTrue(issubclass(Color, StdlibFlag))

    @unittest.skipUnless(StdlibFlag and pyver < PY3_11, 'Stdlib Flag not available')
    def test_extend_flag_backwards_stdlib(self):
        class Color(StdlibFlag):
            BLACK = 0
            RED = 1
            GREEN = 2
            BLUE = 4
        extend_enum(Color, 'PURPLE', 11)
        self.assertTrue(Color(11) is Color.PURPLE)
        self.assertTrue(isinstance(Color.PURPLE, Color))
        self.assertEqual(Color.PURPLE.value, 11)
        self.assertTrue(issubclass(Color, StdlibFlag))
        #
        extend_enum(Color, 'MAGENTA')
        self.assertTrue(Color(16) is Color.MAGENTA)
        self.assertTrue(isinstance(Color.MAGENTA, Color))
        self.assertEqual(Color.MAGENTA.value,16)
        #
        extend_enum(Color, 'mauve')
        self.assertEqual(Color.mauve.name, 'mauve')
        self.assertEqual(Color.mauve.value, 32)
        self.assertTrue(Color.mauve in Color)
        self.assertEqual(Color(32), Color.mauve)
        self.assertEqual(Color['mauve'], Color.mauve)

    @unittest.skipUnless(StdlibFlag and pyver >= PY3_11, 'Stdlib Flag not available')
    def test_extend_flag_backwards_stdlib(self):
        class Color(StdlibFlag):
            BLACK = 0
            RED = 1
            GREEN = 2
            BLUE = 4
        extend_enum(Color, 'PURPLE', 11)
        self.assertTrue(Color(11) is Color.PURPLE)
        self.assertTrue(isinstance(Color.PURPLE, Color))
        self.assertEqual(Color.PURPLE.value, 11)
        self.assertTrue(issubclass(Color, StdlibFlag))
        #
        extend_enum(Color, 'MAGENTA')
        self.assertTrue(Color(8) is Color.MAGENTA)
        self.assertTrue(isinstance(Color.MAGENTA, Color))
        self.assertEqual(Color.MAGENTA.value,8)
        #
        extend_enum(Color, 'mauve')
        self.assertEqual(Color.mauve.name, 'mauve')
        self.assertEqual(Color.mauve.value, 16)
        self.assertTrue(Color.mauve in Color)
        self.assertEqual(Color(16), Color.mauve)
        self.assertEqual(Color['mauve'], Color.mauve)

    @unittest.skipUnless(StdlibIntFlag, 'Stdlib IntFlag not available')
    def test_extend_intflag_stdlib(self):
        class Color(StdlibIntFlag):
            BLACK = 0
            RED = 1
            GREEN = 2
            BLUE = 4
        extend_enum(Color, 'MAGENTA')
        self.assertTrue(Color(8) is Color.MAGENTA)
        self.assertTrue(isinstance(Color.MAGENTA, Color))
        self.assertEqual(Color.MAGENTA.value, 8)
        extend_enum(Color, 'PURPLE', 11)
        self.assertTrue(Color(11) is Color.PURPLE)
        self.assertTrue(isinstance(Color.PURPLE, Color))
        self.assertEqual(Color.PURPLE.value, 11)
        self.assertTrue(issubclass(Color, StdlibFlag))
        #
        extend_enum(Color, 'mauve')
        self.assertEqual(Color.mauve.name, 'mauve')
        self.assertEqual(Color.mauve.value, 16)
        self.assertTrue(Color.mauve in Color)
        self.assertEqual(Color(16), Color.mauve)
        self.assertEqual(Color['mauve'], Color.mauve)

    @unittest.skipUnless(StdlibIntFlag, 'Stdlib IntFlag not available')
    def test_extend_intflag_backwards_stdlib(self):
        class Color(StdlibIntFlag):
            BLACK = 0
            RED = 1
            GREEN = 2
            BLUE = 4
        if pyver >= PY3_11:
            # flags make more sense in 3.11
            length = 5
            MAGENTA = 8
            mauve = 16
        else:
            length = 7
            MAGENTA = 16
            mauve = 32
        extend_enum(Color, 'PURPLE', 11)
        self.assertTrue(Color(11) is Color.PURPLE)
        self.assertTrue(isinstance(Color.PURPLE, Color))
        self.assertEqual(Color.PURPLE.value, 11)
        self.assertTrue(issubclass(Color, StdlibFlag))
        #
        extend_enum(Color, 'MAGENTA')
        self.assertTrue(Color(MAGENTA) is Color.MAGENTA)
        self.assertTrue(isinstance(Color.MAGENTA, Color))
        self.assertEqual(Color.MAGENTA.value, MAGENTA)
        #
        extend_enum(Color, 'mauve')
        self.assertEqual(Color.mauve.name, 'mauve')
        self.assertEqual(Color.mauve.value, mauve)
        self.assertTrue(Color.mauve in Color)
        self.assertEqual(Color(mauve), Color.mauve)
        self.assertEqual(Color['mauve'], Color.mauve)
        self.assertEqual(len(Color), length, list(Color))

    @unittest.skipUnless(StdlibStrEnum, 'Stdlib StrEnum not available')
    def test_extend_strenum_stdlib(self):
        class Color(StrEnum):
            RED = auto()
            GREEN = auto()
            BLUE = auto()
        extend_enum(Color, 'BLACK')
        self.assertEqual(Color.BLACK.name, 'BLACK')
        self.assertEqual(Color.BLACK.value, 'black')
        self.assertEqual(len(Color), 4)


if __name__ == '__main__':
    raise RuntimeError("'test_v3.py' should not be run by itself; it's included in 'test.py'")

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