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306 lines
11 KiB
Python
306 lines
11 KiB
Python
from unittest import mock
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from django.db.models import TextChoices
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from django.test import SimpleTestCase
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from django.utils.choices import CallableChoiceIterator, normalize_choices
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from django.utils.translation import gettext_lazy as _
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class NormalizeFieldChoicesTests(SimpleTestCase):
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expected = [
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("C", _("Club")),
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("D", _("Diamond")),
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("H", _("Heart")),
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("S", _("Spade")),
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]
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expected_nested = [
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("Audio", [("vinyl", _("Vinyl")), ("cd", _("CD"))]),
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("Video", [("vhs", _("VHS Tape")), ("dvd", _("DVD"))]),
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("unknown", _("Unknown")),
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]
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invalid = [
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1j,
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123,
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123.45,
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"invalid",
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b"invalid",
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_("invalid"),
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object(),
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None,
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True,
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False,
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]
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invalid_iterable = [
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# Special cases of a string-likes which would unpack incorrectly.
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["ab"],
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[b"ab"],
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[_("ab")],
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# Non-iterable items or iterable items with incorrect number of
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# elements that cannot be unpacked.
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[123],
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[("value",)],
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[("value", "label", "other")],
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]
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invalid_nested = [
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# Nested choices can only be two-levels deep, so return callables,
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# mappings, iterables, etc. at deeper levels unmodified.
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[("Group", [("Value", lambda: "Label")])],
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[("Group", [("Value", {"Label 1?": "Label 2?"})])],
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[("Group", [("Value", [("Label 1?", "Label 2?")])])],
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]
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def test_empty(self):
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def generator():
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yield from ()
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for choices in ({}, [], (), set(), frozenset(), generator()):
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with self.subTest(choices=choices):
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self.assertEqual(normalize_choices(choices), [])
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def test_choices(self):
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class Medal(TextChoices):
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GOLD = "GOLD", _("Gold")
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SILVER = "SILVER", _("Silver")
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BRONZE = "BRONZE", _("Bronze")
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expected = [
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("GOLD", _("Gold")),
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("SILVER", _("Silver")),
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("BRONZE", _("Bronze")),
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]
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self.assertEqual(normalize_choices(Medal), expected)
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def test_callable(self):
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def get_choices():
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return {
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"C": _("Club"),
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"D": _("Diamond"),
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"H": _("Heart"),
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"S": _("Spade"),
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}
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get_choices_spy = mock.Mock(wraps=get_choices)
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output = normalize_choices(get_choices_spy)
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get_choices_spy.assert_not_called()
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self.assertIsInstance(output, CallableChoiceIterator)
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self.assertEqual(list(output), self.expected)
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get_choices_spy.assert_called_once()
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def test_mapping(self):
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choices = {
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"C": _("Club"),
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"D": _("Diamond"),
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"H": _("Heart"),
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"S": _("Spade"),
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}
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self.assertEqual(normalize_choices(choices), self.expected)
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def test_iterable(self):
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choices = [
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("C", _("Club")),
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("D", _("Diamond")),
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("H", _("Heart")),
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("S", _("Spade")),
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]
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self.assertEqual(normalize_choices(choices), self.expected)
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def test_iterator(self):
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def generator():
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yield "C", _("Club")
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yield "D", _("Diamond")
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yield "H", _("Heart")
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yield "S", _("Spade")
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choices = generator()
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self.assertEqual(normalize_choices(choices), self.expected)
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def test_nested_callable(self):
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def get_audio_choices():
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return [("vinyl", _("Vinyl")), ("cd", _("CD"))]
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def get_video_choices():
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return [("vhs", _("VHS Tape")), ("dvd", _("DVD"))]
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def get_media_choices():
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return [
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("Audio", get_audio_choices),
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("Video", get_video_choices),
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("unknown", _("Unknown")),
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]
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get_media_choices_spy = mock.Mock(wraps=get_media_choices)
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output = normalize_choices(get_media_choices_spy)
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get_media_choices_spy.assert_not_called()
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self.assertIsInstance(output, CallableChoiceIterator)
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self.assertEqual(list(output), self.expected_nested)
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get_media_choices_spy.assert_called_once()
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def test_nested_mapping(self):
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choices = {
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"Audio": {"vinyl": _("Vinyl"), "cd": _("CD")},
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"Video": {"vhs": _("VHS Tape"), "dvd": _("DVD")},
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"unknown": _("Unknown"),
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}
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self.assertEqual(normalize_choices(choices), self.expected_nested)
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def test_nested_iterable(self):
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choices = [
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("Audio", [("vinyl", _("Vinyl")), ("cd", _("CD"))]),
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("Video", [("vhs", _("VHS Tape")), ("dvd", _("DVD"))]),
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("unknown", _("Unknown")),
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]
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self.assertEqual(normalize_choices(choices), self.expected_nested)
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def test_nested_iterator(self):
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def generate_audio_choices():
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yield "vinyl", _("Vinyl")
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yield "cd", _("CD")
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def generate_video_choices():
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yield "vhs", _("VHS Tape")
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yield "dvd", _("DVD")
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def generate_media_choices():
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yield "Audio", generate_audio_choices()
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yield "Video", generate_video_choices()
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yield "unknown", _("Unknown")
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choices = generate_media_choices()
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self.assertEqual(normalize_choices(choices), self.expected_nested)
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def test_callable_non_canonical(self):
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# Canonical form is list of 2-tuple, but nested lists should work.
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def get_choices():
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return [
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["C", _("Club")],
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["D", _("Diamond")],
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["H", _("Heart")],
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["S", _("Spade")],
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]
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get_choices_spy = mock.Mock(wraps=get_choices)
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output = normalize_choices(get_choices_spy)
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get_choices_spy.assert_not_called()
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self.assertIsInstance(output, CallableChoiceIterator)
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self.assertEqual(list(output), self.expected)
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get_choices_spy.assert_called_once()
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def test_iterable_non_canonical(self):
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# Canonical form is list of 2-tuple, but nested lists should work.
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choices = [
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["C", _("Club")],
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["D", _("Diamond")],
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["H", _("Heart")],
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["S", _("Spade")],
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]
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self.assertEqual(normalize_choices(choices), self.expected)
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def test_iterator_non_canonical(self):
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# Canonical form is list of 2-tuple, but nested lists should work.
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def generator():
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yield ["C", _("Club")]
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yield ["D", _("Diamond")]
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yield ["H", _("Heart")]
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yield ["S", _("Spade")]
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choices = generator()
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self.assertEqual(normalize_choices(choices), self.expected)
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def test_nested_callable_non_canonical(self):
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# Canonical form is list of 2-tuple, but nested lists should work.
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def get_audio_choices():
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return [["vinyl", _("Vinyl")], ["cd", _("CD")]]
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def get_video_choices():
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return [["vhs", _("VHS Tape")], ["dvd", _("DVD")]]
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def get_media_choices():
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return [
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["Audio", get_audio_choices],
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["Video", get_video_choices],
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["unknown", _("Unknown")],
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]
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get_media_choices_spy = mock.Mock(wraps=get_media_choices)
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output = normalize_choices(get_media_choices_spy)
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get_media_choices_spy.assert_not_called()
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self.assertIsInstance(output, CallableChoiceIterator)
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self.assertEqual(list(output), self.expected_nested)
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get_media_choices_spy.assert_called_once()
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def test_nested_iterable_non_canonical(self):
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# Canonical form is list of 2-tuple, but nested lists should work.
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choices = [
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["Audio", [["vinyl", _("Vinyl")], ["cd", _("CD")]]],
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["Video", [["vhs", _("VHS Tape")], ["dvd", _("DVD")]]],
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["unknown", _("Unknown")],
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]
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self.assertEqual(normalize_choices(choices), self.expected_nested)
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def test_nested_iterator_non_canonical(self):
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# Canonical form is list of 2-tuple, but nested lists should work.
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def generator():
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yield ["Audio", [["vinyl", _("Vinyl")], ["cd", _("CD")]]]
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yield ["Video", [["vhs", _("VHS Tape")], ["dvd", _("DVD")]]]
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yield ["unknown", _("Unknown")]
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choices = generator()
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self.assertEqual(normalize_choices(choices), self.expected_nested)
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def test_nested_mixed_mapping_and_iterable(self):
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# Although not documented, as it's better to stick to either mappings
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# or iterables, nesting of mappings within iterables and vice versa
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# works and is likely to occur in the wild. This is supported by the
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# recursive call to `normalize_choices()` which will normalize nested
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# choices.
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choices = {
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"Audio": [("vinyl", _("Vinyl")), ("cd", _("CD"))],
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"Video": [("vhs", _("VHS Tape")), ("dvd", _("DVD"))],
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"unknown": _("Unknown"),
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}
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self.assertEqual(normalize_choices(choices), self.expected_nested)
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choices = [
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("Audio", {"vinyl": _("Vinyl"), "cd": _("CD")}),
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("Video", {"vhs": _("VHS Tape"), "dvd": _("DVD")}),
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("unknown", _("Unknown")),
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]
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self.assertEqual(normalize_choices(choices), self.expected_nested)
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def test_iterable_set(self):
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# Although not documented, as sets are unordered which results in
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# randomised order in form fields, passing a set of 2-tuples works.
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# Consistent ordering of choices on model fields in migrations is
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# enforced by the migrations serializer.
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choices = {
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("C", _("Club")),
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("D", _("Diamond")),
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("H", _("Heart")),
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("S", _("Spade")),
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}
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self.assertEqual(sorted(normalize_choices(choices)), sorted(self.expected))
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def test_unsupported_values_returned_unmodified(self):
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# Unsupported values must be returned unmodified for model system check
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# to work correctly.
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for value in self.invalid + self.invalid_iterable + self.invalid_nested:
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with self.subTest(value=value):
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self.assertEqual(normalize_choices(value), value)
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def test_unsupported_values_from_callable_returned_unmodified(self):
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for value in self.invalid_iterable + self.invalid_nested:
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with self.subTest(value=value):
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self.assertEqual(list(normalize_choices(lambda: value)), value)
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def test_unsupported_values_from_iterator_returned_unmodified(self):
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for value in self.invalid_nested:
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with self.subTest(value=value):
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self.assertEqual(
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list(normalize_choices((lambda: (yield from value))())),
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value,
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)
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