from django import forms

from django.core.exceptions import ValidationError

from django.test import TestCase

from .models import UUIDPK

class UUIDPKForm(forms.ModelForm):

    class Meta:

        model = UUIDPK

        fields = "__all__"

class ModelFormBaseTest(TestCase):

    def test_create_save_error(self):

        form = UUIDPKForm({})

        self.assertFalse(form.is_valid())

        msg = "The UUIDPK could not be created because the data didn't validate."

        with self.assertRaisesMessage(ValueError, msg):

            form.save()

    def test_update_save_error(self):

        obj = UUIDPK.objects.create(name="foo")

        form = UUIDPKForm({}, instance=obj)

        self.assertFalse(form.is_valid())

        msg = "The UUIDPK could not be changed because the data didn't validate."

        with self.assertRaisesMessage(ValueError, msg):

            form.save()

    def test_model_multiple_choice_field_uuid_pk(self):

        f = forms.ModelMultipleChoiceField(UUIDPK.objects.all())

        with self.assertRaisesMessage(

            ValidationError, "“invalid_uuid” is not a valid UUID."

        ):

            f.clean(["invalid_uuid"])