tests.py

import datetime
import decimal
import ipaddress
import uuid

from django.db import models
from django.template import Context, Template
from django.test import SimpleTestCase
from django.utils.functional import Promise
from django.utils.translation import gettext_lazy as _


class Suit(models.IntegerChoices):
    DIAMOND = 1, _("Diamond")
    SPADE = 2, _("Spade")
    HEART = 3, _("Heart")
    CLUB = 4, _("Club")


class YearInSchool(models.TextChoices):
    FRESHMAN = "FR", _("Freshman")
    SOPHOMORE = "SO", _("Sophomore")
    JUNIOR = "JR", _("Junior")
    SENIOR = "SR", _("Senior")
    GRADUATE = "GR", _("Graduate")


class Vehicle(models.IntegerChoices):
    CAR = 1, "Carriage"
    TRUCK = 2
    JET_SKI = 3

    __empty__ = _("(Unknown)")


class Gender(models.TextChoices):
    MALE = "M"
    FEMALE = "F"
    NOT_SPECIFIED = "X"

    __empty__ = "(Undeclared)"


class ChoicesTests(SimpleTestCase):
    def test_integerchoices(self):
        self.assertEqual(
            Suit.choices, [(1, "Diamond"), (2, "Spade"), (3, "Heart"), (4, "Club")]
        )
        self.assertEqual(Suit.labels, ["Diamond", "Spade", "Heart", "Club"])
        self.assertEqual(Suit.values, [1, 2, 3, 4])
        self.assertEqual(Suit.names, ["DIAMOND", "SPADE", "HEART", "CLUB"])

        self.assertEqual(repr(Suit.DIAMOND), "Suit.DIAMOND")
        self.assertEqual(Suit.DIAMOND.label, "Diamond")
        self.assertEqual(Suit.DIAMOND.value, 1)
        self.assertEqual(Suit["DIAMOND"], Suit.DIAMOND)
        self.assertEqual(Suit(1), Suit.DIAMOND)

        self.assertIsInstance(Suit, type(models.Choices))
        self.assertIsInstance(Suit.DIAMOND, Suit)
        self.assertIsInstance(Suit.DIAMOND.label, Promise)
        self.assertIsInstance(Suit.DIAMOND.value, int)

    def test_integerchoices_auto_label(self):
        self.assertEqual(Vehicle.CAR.label, "Carriage")
        self.assertEqual(Vehicle.TRUCK.label, "Truck")
        self.assertEqual(Vehicle.JET_SKI.label, "Jet Ski")

    def test_integerchoices_empty_label(self):
        self.assertEqual(Vehicle.choices[0], (None, "(Unknown)"))
        self.assertEqual(Vehicle.labels[0], "(Unknown)")
        self.assertIsNone(Vehicle.values[0])
        self.assertEqual(Vehicle.names[0], "__empty__")

    def test_integerchoices_functional_api(self):
        Place = models.IntegerChoices("Place", "FIRST SECOND THIRD")
        self.assertEqual(Place.labels, ["First", "Second", "Third"])
        self.assertEqual(Place.values, [1, 2, 3])
        self.assertEqual(Place.names, ["FIRST", "SECOND", "THIRD"])

    def test_integerchoices_containment(self):
        self.assertIn(Suit.DIAMOND, Suit)
        self.assertIn(1, Suit)
        self.assertNotIn(0, Suit)

    def test_textchoices(self):
        self.assertEqual(
            YearInSchool.choices,
            [
                ("FR", "Freshman"),
                ("SO", "Sophomore"),
                ("JR", "Junior"),
                ("SR", "Senior"),
                ("GR", "Graduate"),
            ],
        )
        self.assertEqual(
            YearInSchool.labels,
            ["Freshman", "Sophomore", "Junior", "Senior", "Graduate"],
        )
        self.assertEqual(YearInSchool.values, ["FR", "SO", "JR", "SR", "GR"])
        self.assertEqual(
            YearInSchool.names,
            ["FRESHMAN", "SOPHOMORE", "JUNIOR", "SENIOR", "GRADUATE"],
        )

        self.assertEqual(repr(YearInSchool.FRESHMAN), "YearInSchool.FRESHMAN")
        self.assertEqual(YearInSchool.FRESHMAN.label, "Freshman")
        self.assertEqual(YearInSchool.FRESHMAN.value, "FR")
        self.assertEqual(YearInSchool["FRESHMAN"], YearInSchool.FRESHMAN)
        self.assertEqual(YearInSchool("FR"), YearInSchool.FRESHMAN)

        self.assertIsInstance(YearInSchool, type(models.Choices))
        self.assertIsInstance(YearInSchool.FRESHMAN, YearInSchool)
        self.assertIsInstance(YearInSchool.FRESHMAN.label, Promise)
        self.assertIsInstance(YearInSchool.FRESHMAN.value, str)

    def test_textchoices_auto_label(self):
        self.assertEqual(Gender.MALE.label, "Male")
        self.assertEqual(Gender.FEMALE.label, "Female")
        self.assertEqual(Gender.NOT_SPECIFIED.label, "Not Specified")

    def test_textchoices_empty_label(self):
        self.assertEqual(Gender.choices[0], (None, "(Undeclared)"))
        self.assertEqual(Gender.labels[0], "(Undeclared)")
        self.assertIsNone(Gender.values[0])
        self.assertEqual(Gender.names[0], "__empty__")

    def test_textchoices_functional_api(self):
        Medal = models.TextChoices("Medal", "GOLD SILVER BRONZE")
        self.assertEqual(Medal.labels, ["Gold", "Silver", "Bronze"])
        self.assertEqual(Medal.values, ["GOLD", "SILVER", "BRONZE"])
        self.assertEqual(Medal.names, ["GOLD", "SILVER", "BRONZE"])

    def test_textchoices_containment(self):
        self.assertIn(YearInSchool.FRESHMAN, YearInSchool)
        self.assertIn("FR", YearInSchool)
        self.assertNotIn("XX", YearInSchool)

    def test_textchoices_blank_value(self):
        class BlankStr(models.TextChoices):
            EMPTY = "", "(Empty)"
            ONE = "ONE", "One"

        self.assertEqual(BlankStr.labels, ["(Empty)", "One"])
        self.assertEqual(BlankStr.values, ["", "ONE"])
        self.assertEqual(BlankStr.names, ["EMPTY", "ONE"])

    def test_invalid_definition(self):
        msg = "'str' object cannot be interpreted as an integer"
        with self.assertRaisesMessage(TypeError, msg):

            class InvalidArgumentEnum(models.IntegerChoices):
                # A string is not permitted as the second argument to int().
                ONE = 1, "X", "Invalid"

        msg = "duplicate values found in <enum 'Fruit'>: PINEAPPLE -> APPLE"
        with self.assertRaisesMessage(ValueError, msg):

            class Fruit(models.IntegerChoices):
                APPLE = 1, "Apple"
                PINEAPPLE = 1, "Pineapple"

    def test_str(self):
        for test in [Gender, Suit, YearInSchool, Vehicle]:
            for member in test:
                with self.subTest(member=member):
                    self.assertEqual(str(test[member.name]), str(member.value))

    def test_templates(self):
        template = Template("{{ Suit.DIAMOND.label }}|{{ Suit.DIAMOND.value }}")
        output = template.render(Context({"Suit": Suit}))
        self.assertEqual(output, "Diamond|1")

    def test_property_names_conflict_with_member_names(self):
        with self.assertRaises(AttributeError):
            models.TextChoices("Properties", "choices labels names values")

    def test_label_member(self):
        # label can be used as a member.
        Stationery = models.TextChoices("Stationery", "label stamp sticker")
        self.assertEqual(Stationery.label.label, "Label")
        self.assertEqual(Stationery.label.value, "label")
        self.assertEqual(Stationery.label.name, "label")

    def test_do_not_call_in_templates_member(self):
        # do_not_call_in_templates is not implicitly treated as a member.
        Special = models.IntegerChoices("Special", "do_not_call_in_templates")
        self.assertEqual(
            Special.do_not_call_in_templates.label,
            "Do Not Call In Templates",
        )
        self.assertEqual(Special.do_not_call_in_templates.value, 1)
        self.assertEqual(
            Special.do_not_call_in_templates.name,
            "do_not_call_in_templates",
        )


class Separator(bytes, models.Choices):
    FS = b"\x1c", "File Separator"
    GS = b"\x1d", "Group Separator"
    RS = b"\x1e", "Record Separator"
    US = b"\x1f", "Unit Separator"


class Constants(float, models.Choices):
    PI = 3.141592653589793, "π"
    TAU = 6.283185307179586, "τ"


class Set(frozenset, models.Choices):
    A = {1, 2}
    B = {2, 3}
    UNION = A | B
    DIFFERENCE = A - B
    INTERSECTION = A & B


class MoonLandings(datetime.date, models.Choices):
    APOLLO_11 = 1969, 7, 20, "Apollo 11 (Eagle)"
    APOLLO_12 = 1969, 11, 19, "Apollo 12 (Intrepid)"
    APOLLO_14 = 1971, 2, 5, "Apollo 14 (Antares)"
    APOLLO_15 = 1971, 7, 30, "Apollo 15 (Falcon)"
    APOLLO_16 = 1972, 4, 21, "Apollo 16 (Orion)"
    APOLLO_17 = 1972, 12, 11, "Apollo 17 (Challenger)"


class DateAndTime(datetime.datetime, models.Choices):
    A = 2010, 10, 10, 10, 10, 10
    B = 2011, 11, 11, 11, 11, 11
    C = 2012, 12, 12, 12, 12, 12


class MealTimes(datetime.time, models.Choices):
    BREAKFAST = 7, 0
    LUNCH = 13, 0
    DINNER = 18, 30


class Frequency(datetime.timedelta, models.Choices):
    WEEK = 0, 0, 0, 0, 0, 0, 1, "Week"
    DAY = 1, "Day"
    HOUR = 0, 0, 0, 0, 0, 1, "Hour"
    MINUTE = 0, 0, 0, 0, 1, "Hour"
    SECOND = 0, 1, "Second"


class Number(decimal.Decimal, models.Choices):
    E = 2.718281828459045, "e"
    PI = "3.141592653589793", "π"
    TAU = decimal.Decimal("6.283185307179586"), "τ"


class IPv4Address(ipaddress.IPv4Address, models.Choices):
    LOCALHOST = "127.0.0.1", "Localhost"
    GATEWAY = "192.168.0.1", "Gateway"
    BROADCAST = "192.168.0.255", "Broadcast"


class IPv6Address(ipaddress.IPv6Address, models.Choices):
    LOCALHOST = "::1", "Localhost"
    UNSPECIFIED = "::", "Unspecified"


class IPv4Network(ipaddress.IPv4Network, models.Choices):
    LOOPBACK = "127.0.0.0/8", "Loopback"
    LINK_LOCAL = "169.254.0.0/16", "Link-Local"
    PRIVATE_USE_A = "10.0.0.0/8", "Private-Use (Class A)"


class IPv6Network(ipaddress.IPv6Network, models.Choices):
    LOOPBACK = "::1/128", "Loopback"
    UNSPECIFIED = "::/128", "Unspecified"
    UNIQUE_LOCAL = "fc00::/7", "Unique-Local"
    LINK_LOCAL_UNICAST = "fe80::/10", "Link-Local Unicast"


class CustomChoicesTests(SimpleTestCase):
    def test_labels_valid(self):
        enums = (
            Separator,
            Constants,
            Set,
            MoonLandings,
            DateAndTime,
            MealTimes,
            Frequency,
            Number,
            IPv4Address,
            IPv6Address,
            IPv4Network,
            IPv6Network,
        )
        for choice_enum in enums:
            with self.subTest(choice_enum.__name__):
                self.assertNotIn(None, choice_enum.labels)

    def test_bool_unsupported(self):
        msg = "type 'bool' is not an acceptable base type"
        with self.assertRaisesMessage(TypeError, msg):

            class Boolean(bool, models.Choices):
                pass

    def test_timezone_unsupported(self):
        msg = "type 'datetime.timezone' is not an acceptable base type"
        with self.assertRaisesMessage(TypeError, msg):

            class Timezone(datetime.timezone, models.Choices):
                pass

    def test_uuid_unsupported(self):
        with self.assertRaises(TypeError):

            class Identifier(uuid.UUID, models.Choices):
                A = "972ce4eb-a95f-4a56-9339-68c208a76f18"