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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!
"""
Tests for the PrefixList handler.
"""
import pickle
import unittest
from traits.api import HasTraits, TraitError, PrefixList
class TestPrefixList(unittest.TestCase):
def test_assignment(self):
class A(HasTraits):
foo = PrefixList(["zero", "one", "two"], default_value="one")
a = A()
a.foo = 'z'
self.assertEqual(a.foo, "zero")
with self.assertRaises(TraitError) as exception_context:
a.foo = ''
self.assertIn(
"The 'foo' trait of an A instance must be 'zero' or 'one' or 'two'"
" (or any unique prefix), but a value of ''",
str(exception_context.exception),
)
def test_bad_types(self):
class A(HasTraits):
foo = PrefixList(["zero", "one", "two"], default_value="one")
a = A()
wrong_type = [[], (1, 2, 3), 1j, 2.3, 23, b"zero", None]
for value in wrong_type:
with self.subTest(value=value):
with self.assertRaises(TraitError):
a.foo = value
def test_repeated_prefix(self):
class A(HasTraits):
foo = PrefixList(("abc1", "abc2"))
a = A()
a.foo = "abc1"
self.assertEqual(a.foo, "abc1")
with self.assertRaises(TraitError):
a.foo = "abc"
def test_default_default(self):
class A(HasTraits):
foo = PrefixList(["zero", "one", "two"], default_value="zero")
a = A()
self.assertEqual(a.foo, "zero")
def test_explicit_default(self):
class A(HasTraits):
foo = PrefixList(["zero", "one", "two"], default_value="one")
a = A()
self.assertEqual(a.foo, "one")
def test_default_subject_to_completion(self):
class A(HasTraits):
foo = PrefixList(["zero", "one", "two"], default_value="o")
a = A()
self.assertEqual(a.foo, "one")
def test_default_subject_to_validation(self):
with self.assertRaises(ValueError):
class A(HasTraits):
foo = PrefixList(["zero", "one", "two"], default_value="uno")
def test_default_legal_but_not_unique_prefix(self):
# Corner case to exercise internal logic: the default is not a unique
# prefix, but it is one of the list of values, so it's legal.
class A(HasTraits):
foo = PrefixList(["live", "modal", "livemodal"], default="live")
a = A()
self.assertEqual(a.foo, "live")
def test_default_value_cant_be_passed_by_position(self):
with self.assertRaises(TypeError):
PrefixList(["zero", "one", "two"], "one")
def test_values_not_sequence(self):
# Defining values with this signature is not supported
with self.assertRaises(TypeError):
PrefixList("zero", "one", "two")
def test_values_not_all_iterables(self):
# Make sure we don't confuse other sequence types, e.g. str
with self.assertRaises(TypeError) as exception_context:
PrefixList("zero")
self.assertEqual(
str(exception_context.exception),
"values should be a collection of strings, not 'zero'"
)
def test_values_is_empty(self):
# it doesn't make sense to use a PrefixList with an empty list, so make
# sure we raise a ValueError
with self.assertRaises(ValueError):
PrefixList([])
def test_values_is_empty_with_default_value(self):
# Raise even if we give a default value.
with self.assertRaises(ValueError):
PrefixList([], default_value="one")
def test_no_nested_exception(self):
# Regression test for enthought/traits#1155
class A(HasTraits):
foo = PrefixList(["zero", "one", "two"])
a = A()
try:
a.foo = "three"
except TraitError as exc:
self.assertIsNone(exc.__context__)
self.assertIsNone(exc.__cause__)
def test_pickle_roundtrip(self):
class A(HasTraits):
foo = PrefixList(["zero", "one", "two"], default_value="one")
a = A()
foo_trait = a.traits()["foo"]
reconstituted = pickle.loads(pickle.dumps(foo_trait))
self.assertEqual(
foo_trait.validate(a, "foo", "ze"),
"zero",
)
with self.assertRaises(TraitError):
foo_trait.validate(a, "foo", "zero-knowledge")
self.assertEqual(
reconstituted.validate(a, "foo", "ze"),
"zero",
)
with self.assertRaises(TraitError):
reconstituted.validate(a, "foo", "zero-knowledge")
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