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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
import unittest
from traits.api import HasTraits, TraitError
from traits.trait_types import _NoneTrait
class A(HasTraits):
none_atr = _NoneTrait(default_value=None)
class TestCaseNoneTrait(unittest.TestCase):
def test_none(self):
obj = A()
self.assertIsNone(obj.none_atr)
def test_assign_non_none(self):
with self.assertRaises(TraitError):
A(none_atr=5)
def test_default_value_not_none(self):
with self.assertRaises(ValueError):
class TestClass(HasTraits):
none_trait = _NoneTrait(default_value=[])
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