django/tests/model_fields/test_charfield.py

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from unittest import skipIf
from django.core.exceptions import ValidationError
from django.db import connection, models
from django.test import SimpleTestCase, TestCase
from .models import Post
class TestCharField(TestCase):
def test_max_length_passed_to_formfield(self):
"""
CharField passes its max_length attribute to form fields created using
the formfield() method.
"""
cf1 = models.CharField()
cf2 = models.CharField(max_length=1234)
self.assertIsNone(cf1.formfield().max_length)
self.assertEqual(1234, cf2.formfield().max_length)
def test_lookup_integer_in_charfield(self):
self.assertEqual(Post.objects.filter(title=9).count(), 0)
@skipIf(connection.vendor == 'mysql', 'Running on MySQL requires utf8mb4 encoding (#18392)')
def test_emoji(self):
p = Post.objects.create(title='Smile 😀', body='Whatever.')
p.refresh_from_db()
self.assertEqual(p.title, 'Smile 😀')
class ValidationTests(SimpleTestCase):
def test_charfield_raises_error_on_empty_string(self):
f = models.CharField()
with self.assertRaises(ValidationError):
f.clean('', None)
def test_charfield_cleans_empty_string_when_blank_true(self):
f = models.CharField(blank=True)
self.assertEqual('', f.clean('', None))
def test_charfield_with_choices_cleans_valid_choice(self):
f = models.CharField(max_length=1, choices=[('a', 'A'), ('b', 'B')])
self.assertEqual('a', f.clean('a', None))
def test_charfield_with_choices_raises_error_on_invalid_choice(self):
f = models.CharField(choices=[('a', 'A'), ('b', 'B')])
with self.assertRaises(ValidationError):
f.clean('not a', None)
def test_charfield_raises_error_on_empty_input(self):
f = models.CharField(null=False)
with self.assertRaises(ValidationError):
f.clean(None, None)