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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 PrefixMap handler.
"""
import pickle
import unittest
from traits.api import HasTraits, Int, PrefixMap, TraitError
class Person(HasTraits):
married = PrefixMap({"yes": 1, "yeah": 1, "no": 0, "nah": 0})
class TestPrefixMap(unittest.TestCase):
def test_assignment(self):
person = Person()
# Test prefix
person.married = "yea"
self.assertEqual("yeah", person.married)
self.assertEqual(1, person.married_)
person.married = "yes"
self.assertEqual("yes", person.married)
self.assertEqual(1, person.married_)
person.married = "na"
self.assertEqual("nah", person.married)
self.assertEqual(0, person.married_)
with self.assertRaises(TraitError):
person.married = "unknown"
# Test duplicate prefix
with self.assertRaises(TraitError):
person.married = "ye"
def test_bad_types(self):
person = Person()
wrong_type = [[], (1, 2, 3), 1j, 2.3, 23, b"not a string", None]
for value in wrong_type:
with self.subTest(value=value):
with self.assertRaises(TraitError):
person.married = value
def test_no_default(self):
mapping = {"yes": 1, "yeah": 1, "no": 0, "nah": 0}
class Person(HasTraits):
married = PrefixMap(mapping)
p = Person()
# Since we're using Python >= 3.6, we can rely on dictionaries
# being ordered, and then the default is predictable.
self.assertEqual(p.married, "yes")
self.assertEqual(p.married_, 1)
def test_default(self):
class Person(HasTraits):
married = PrefixMap({"yes": 1, "yeah": 1, "no": 0, "nah": 0},
default_value="nah")
p = Person()
self.assertEqual(p.married, "nah")
self.assertEqual(p.married_, 0)
def test_default_keyword_only(self):
with self.assertRaises(TypeError):
PrefixMap({"yes": 1, "no": 0}, "yes")
def test_default_method(self):
class Person(HasTraits):
married = PrefixMap({"yes": 1, "yeah": 1, "no": 0, "nah": 0})
default_calls = Int(0)
def _married_default(self):
self.default_calls += 1
return "nah"
p = Person()
self.assertEqual(p.married, "nah")
self.assertEqual(p.married_, 0)
self.assertEqual(p.default_calls, 1)
# Check that the order doesn't matter
p2 = Person()
self.assertEqual(p2.married_, 0)
self.assertEqual(p2.married, "nah")
self.assertEqual(p2.default_calls, 1)
def test_default_static_override_static(self):
class BasePerson(HasTraits):
married = PrefixMap({"yes": 1, "yeah": 1, "no": 0, "nah": 0},
default_value="nah")
class Person(BasePerson):
married = "yes"
p = Person()
self.assertEqual(p.married, "yes")
self.assertEqual(p.married_, 1)
def test_default_static_override_method(self):
class BasePerson(HasTraits):
married = PrefixMap({"yes": 1, "yeah": 1, "no": 0, "nah": 0},
default_value="nah")
class Person(BasePerson):
default_calls = Int(0)
def _married_default(self):
self.default_calls += 1
return "yes"
p = Person()
self.assertEqual(p.married, "yes")
self.assertEqual(p.married_, 1)
self.assertEqual(p.default_calls, 1)
def test_default_method_override_static(self):
class BasePerson(HasTraits):
married = PrefixMap({"yes": 1, "yeah": 1, "no": 0, "nah": 0})
default_calls = Int(0)
def _married_default(self):
self.default_calls += 1
return "nah"
class Person(BasePerson):
married = "yes"
p = Person()
self.assertEqual(p.married, "yes")
self.assertEqual(p.married_, 1)
self.assertEqual(p.default_calls, 0)
def test_default_method_override_method(self):
class BasePerson(HasTraits):
married = PrefixMap({"yes": 1, "yeah": 1, "no": 0, "nah": 0})
default_calls = Int(0)
def _married_default(self):
self.default_calls += 1
return "nah"
class Person(BasePerson):
def _married_default(self):
self.default_calls += 1
return "yes"
p = Person()
self.assertEqual(p.married, "yes")
self.assertEqual(p.married_, 1)
self.assertEqual(p.default_calls, 1)
def test_static_default_transformed(self):
# Test the static default is transformed
class Person(HasTraits):
married = PrefixMap(
{"yes": 1, "yeah": 1, "no": 0}, default_value="yea")
p = Person()
self.assertEqual(p.married, "yeah")
self.assertEqual(p.married_, 1)
# access mapped trait first is okay
p = Person()
self.assertEqual(p.married_, 1)
self.assertEqual(p.married, "yeah")
def test_static_default_validation_error(self):
with self.assertRaises(ValueError):
class Person(HasTraits):
married = PrefixMap(
{"yes": 1, "yeah": 1, "no": 0}, default_value="meh")
def test_no_nested_exception(self):
# Regression test for enthought/traits#1155
class A(HasTraits):
washable = PrefixMap({"yes": 1, "no": 0})
a = A()
try:
a.washable = "affirmatron"
except TraitError as exc:
self.assertIsNone(exc.__context__)
self.assertIsNone(exc.__cause__)
def test_pickle_roundtrip(self):
class Person(HasTraits):
married = PrefixMap({"yes": 1, "yeah": 1, "no": 0, "nah": 0},
default_value="yea")
p = Person()
married_trait = p.traits()["married"]
reconstituted = pickle.loads(pickle.dumps(married_trait))
self.assertEqual(married_trait.validate(p, "married", "yea"), "yeah")
self.assertEqual(reconstituted.validate(p, "married", "yea"), "yeah")
with self.assertRaises(TraitError):
reconstituted.validate(p, "married", "uknown")
with self.assertRaises(TraitError):
reconstituted.validate(p, "married", "ye")
def test_empty_map(self):
with self.assertRaises(ValueError):
PrefixMap({})
def test_pickle_shadow_trait(self):
class Person(HasTraits):
married = PrefixMap({"yes": 1, "yeah": 1, "no": 0, "nah": 0},
default_value="yeah")
p = Person()
married_shadow_trait = p.trait("married_")
reconstituted = pickle.loads(pickle.dumps(married_shadow_trait))
default_value_callable = reconstituted.default_value()[1]
self.assertEqual(default_value_callable(p), 1)
def test_existence_of__map(self):
# This test can be removed once Mayavi no longer depends on the
# existence of the _map attribute.
# xref: enthought/traits#1577
# xref: enthought/mayavi#1094
prefix_map = PrefixMap({"yes": 1, "yeah": 1, "no": 0, "nah": 0})
self.assertEqual(prefix_map._map["yes"], "yes")
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