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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!
from contextlib import contextmanager
import unittest
from traits.ctrait import CTrait
from traits.trait_converters import (
as_ctrait,
check_trait,
trait_cast,
trait_for,
trait_from,
)
from traits.trait_factory import TraitFactory
from traits.trait_handlers import TraitCastType, TraitInstance
from traits.api import Any, Int
@contextmanager
def reset_trait_factory():
from traits import trait_factory
old_tfi = trait_factory._trait_factory_instances.copy()
try:
yield
finally:
trait_factory._trait_factory_instances = old_tfi
class TestTraitCast(unittest.TestCase):
def test_trait_cast_ctrait(self):
ct = Int().as_ctrait()
result = trait_cast(ct)
self.assertIs(result, ct)
def test_trait_cast_trait_type_class(self):
result = trait_cast(Int)
self.assertIsInstance(result, CTrait)
self.assertIsInstance(result.handler, Int)
def test_trait_cast_trait_type_instance(self):
trait = Int()
result = trait_cast(trait)
self.assertIsInstance(result, CTrait)
self.assertIs(result.handler, trait)
def test_trait_cast_trait_factory(self):
int_trait_factory = TraitFactory(lambda: Int().as_ctrait())
with reset_trait_factory():
result = trait_cast(int_trait_factory)
ct = int_trait_factory.as_ctrait()
self.assertIsInstance(result, CTrait)
self.assertIs(result, ct)
def test_trait_cast_none(self):
result = trait_cast(None)
self.assertIsNone(result)
def test_trait_cast_other(self):
result = trait_cast(1)
self.assertIsNone(result)
class TestTraitFrom(unittest.TestCase):
def test_trait_from_ctrait(self):
ct = Int().as_ctrait()
result = trait_from(ct)
self.assertIs(result, ct)
def test_trait_from_trait_type_class(self):
result = trait_from(Int)
self.assertIsInstance(result, CTrait)
self.assertIsInstance(result.handler, Int)
def test_trait_from_trait_type_instance(self):
trait = Int()
result = trait_from(trait)
self.assertIsInstance(result, CTrait)
self.assertIs(result.handler, trait)
def test_trait_from_trait_factory(self):
int_trait_factory = TraitFactory(lambda: Int().as_ctrait())
with reset_trait_factory():
result = trait_from(int_trait_factory)
ct = int_trait_factory.as_ctrait()
self.assertIsInstance(result, CTrait)
self.assertIs(result, ct)
def test_trait_from_none(self):
result = trait_from(None)
self.assertIsInstance(result, CTrait)
self.assertIsInstance(result.handler, Any)
def test_trait_from_other(self):
result = trait_from(1)
self.assertIsInstance(result, CTrait)
self.assertIsInstance(result.handler, TraitCastType)
self.assertEqual(result.handler.aType, int)
class TestCheckTrait(unittest.TestCase):
def test_check_trait_ctrait(self):
ct = Int().as_ctrait()
result = check_trait(ct)
self.assertIs(result, ct)
def test_check_trait_trait_type_class(self):
result = check_trait(Int)
self.assertIsInstance(result, CTrait)
self.assertIsInstance(result.handler, Int)
def test_check_trait_trait_type_instance(self):
trait = Int()
result = check_trait(trait)
self.assertIsInstance(result, CTrait)
self.assertIs(result.handler, trait)
def test_check_trait_trait_factory(self):
int_trait_factory = TraitFactory(lambda: Int().as_ctrait())
with reset_trait_factory():
result = check_trait(int_trait_factory)
ct = int_trait_factory.as_ctrait()
self.assertIsInstance(result, CTrait)
self.assertIs(result, ct)
def test_check_trait_none(self):
result = check_trait(None)
self.assertIsNone(result)
def test_check_trait_other(self):
result = check_trait(1)
self.assertEqual(result, 1)
class TestTraitFor(unittest.TestCase):
def test_trait_for_ctrait(self):
ct = Int().as_ctrait()
result = trait_for(ct)
self.assertIs(result, ct)
def test_trait_for_trait_type_class(self):
result = trait_for(Int)
self.assertIsInstance(result, CTrait)
self.assertIsInstance(result.handler, Int)
def test_trait_for_trait_type_instance(self):
trait = Int()
result = trait_for(trait)
self.assertIsInstance(result, CTrait)
self.assertIs(result.handler, trait)
def test_trait_for_trait_factory(self):
int_trait_factory = TraitFactory(lambda: Int().as_ctrait())
with reset_trait_factory():
result = trait_for(int_trait_factory)
ct = int_trait_factory.as_ctrait()
self.assertIsInstance(result, CTrait)
self.assertIs(result, ct)
def test_trait_for_none(self):
result = trait_for(None)
self.assertIsInstance(result, CTrait)
self.assertIsInstance(result.handler, TraitInstance)
self.assertEqual(result.handler.aClass, type(None))
def test_trait_for_other(self):
result = trait_for(1)
self.assertIsInstance(result, CTrait)
self.assertIsInstance(result.handler, TraitCastType)
self.assertEqual(result.handler.aType, int)
class TestAsCtrait(unittest.TestCase):
def test_as_ctrait_from_ctrait(self):
ct = Int().as_ctrait()
result = as_ctrait(ct)
self.assertIs(result, ct)
def test_as_ctrait_from_class(self):
result = as_ctrait(Int)
self.assertIsInstance(result, CTrait)
self.assertIsInstance(result.handler, Int)
def test_as_ctrait_from_instance(self):
trait = Int()
result = as_ctrait(trait)
self.assertIsInstance(result, CTrait)
self.assertIs(result.handler, trait)
def test_as_ctrait_from_trait_factory(self):
int_trait_factory = TraitFactory(lambda: Int().as_ctrait())
with reset_trait_factory():
result = as_ctrait(int_trait_factory)
ct = int_trait_factory.as_ctrait()
self.assertIsInstance(result, CTrait)
self.assertIs(result, ct)
def test_as_ctrait_raise_exception(self):
with self.assertRaises(TypeError):
as_ctrait(1)
with self.assertRaises(TypeError):
as_ctrait(int)
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