import uuid

from django.core.exceptions import ValidationError

from django.forms import UUIDField

from django.test import SimpleTestCase

class UUIDFieldTest(SimpleTestCase):

    def test_uuidfield_1(self):

        field = UUIDField()

        value = field.clean("550e8400e29b41d4a716446655440000")

        self.assertEqual(value, uuid.UUID("550e8400e29b41d4a716446655440000"))

    def test_clean_value_with_dashes(self):

        field = UUIDField()

        value = field.clean("550e8400-e29b-41d4-a716-446655440000")

        self.assertEqual(value, uuid.UUID("550e8400e29b41d4a716446655440000"))

    def test_uuidfield_2(self):

        field = UUIDField(required=False)

        self.assertIsNone(field.clean(""))

        self.assertIsNone(field.clean(None))

    def test_uuidfield_3(self):

        field = UUIDField()

        with self.assertRaisesMessage(ValidationError, "Enter a valid UUID."):

            field.clean("550e8400")

    def test_uuidfield_4(self):

        field = UUIDField()

        value = field.prepare_value(uuid.UUID("550e8400e29b41d4a716446655440000"))

        self.assertEqual(value, "550e8400-e29b-41d4-a716-446655440000")