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from django.db import transaction
from django.test import TestCase
from .models import FloatModel
class TestFloatField(TestCase):
def test_float_validates_object(self):
instance = FloatModel(size=2.5)
# Try setting float field to unsaved object
instance.size = instance
with transaction.atomic():
with self.assertRaises(TypeError):
instance.save()
# Set value to valid and save
instance.size = 2.5
instance.save()
self.assertTrue(instance.id)
# Set field to object on saved instance
instance.size = instance
msg = (
"Tried to update field model_fields.FloatModel.size with a model "
"instance, %r. Use a value compatible with FloatField."
) % instance
with transaction.atomic():
with self.assertRaisesMessage(TypeError, msg):
instance.save()
# Try setting field to object on retrieved object
obj = FloatModel.objects.get(pk=instance.id)
obj.size = obj
with self.assertRaisesMessage(TypeError, msg):
obj.save()
def test_invalid_value(self):
tests = [
(TypeError, ()),
(TypeError, []),
(TypeError, {}),
(TypeError, set()),
(TypeError, object()),
(TypeError, complex()),
(ValueError, "non-numeric string"),
(ValueError, b"non-numeric byte-string"),
]
for exception, value in tests:
with self.subTest(value):
msg = "Field 'size' expected a number but got %r." % (value,)
with self.assertRaisesMessage(exception, msg):
FloatModel.objects.create(size=value)
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