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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!
""" Unit tests for the Tuple trait type.
"""
import unittest
from traits.api import (
BaseInt, Either, HasTraits, Int, List, Str, TraitError, Tuple)
from traits.tests.tuple_test_mixin import TupleTestMixin
class BadInt(BaseInt):
""" Test class used to simulate a Tuple item with bad validation.
"""
# Describe the trait type
info_text = 'a bad integer'
def validate(self, object, name, value):
# Simulate a coding error in the validation method
return 1 / 0
class TupleTestCase(TupleTestMixin, unittest.TestCase):
def setUp(self):
self.trait = Tuple
def test_unexpected_validation_exceptions_are_propagated(self):
# Regression test for enthought/traits#1389.
class A(HasTraits):
foo = Tuple(BadInt(), BadInt())
bar = Either(Int, Tuple(BadInt(), BadInt()))
a = A()
with self.assertRaises(ZeroDivisionError):
a.foo = (3, 5)
with self.assertRaises(ZeroDivisionError):
a.bar = (3, 5)
def test_non_constant_defaults(self):
class A(HasTraits):
foo = Tuple(List(Int),)
a = A()
a.foo[0].append(35)
self.assertEqual(a.foo[0], [35])
# The inner list should be being validated.
with self.assertRaises(TraitError):
a.foo[0].append(3.5)
# The inner list should not be shared between instances.
b = A()
self.assertEqual(b.foo[0], [])
def test_constant_defaults(self):
# Exercise the code path where all child traits have a constant
# default type.
class A(HasTraits):
foo = Tuple(Int, Tuple(Str, Int))
a = A()
b = A()
self.assertEqual(a.foo, (0, ("", 0)))
self.assertIs(a.foo, b.foo)
def test_lists_not_accepted(self):
class A(HasTraits):
foo = Tuple(Int(), Int())
a = A()
with self.assertRaises(TraitError):
a.foo = [2, 3]
def test_deprecated_list_validation(self):
class A(HasTraits):
foo = Tuple()
a = A()
with self.assertWarns(DeprecationWarning):
a.foo = [2, 3]
self.assertEqual(a.foo, (2, 3))
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