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import warnings
from django.test import TestCase
from .models import Cash, CashModelDeprecated
class FromDBValueDeprecationTests(TestCase):
def test_deprecation(self):
CashModelDeprecated.objects.create(cash='12.50')
with warnings.catch_warnings(record=True) as warns:
warnings.simplefilter('always')
instance = CashModelDeprecated.objects.get()
self.assertIsInstance(instance.cash, Cash)
self.assertEqual(len(warns), 1)
msg = str(warns[0].message)
self.assertEqual(
msg,
'Remove the context parameter from CashFieldDeprecated.from_db_value(). '
'Support for it will be removed in Django 3.0.'
)
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