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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!
""" Test some usage of Trait classes when the code is cythonized.
The tests reflects some of the patterns needed in different applications. They
probably don't cover all of the user case.
Each test case is written as if the test code was in a separate module then
compiled with Cython Inline before evaluation the produced object behaves
properly.
The tests need a Cython version > 0.19 and a compiler.
"""
import unittest
from traits.testing.unittest_tools import UnittestTools
from traits.testing.optional_dependencies import cython, requires_cython
@requires_cython
class CythonizedTraitsTestCase(unittest.TestCase, UnittestTools):
def test_simple_default_methods(self):
code = """
from traits.api import HasTraits, Str
class Test(HasTraits):
name = Str
def _name_default(self):
return 'Joe'
return Test()
"""
obj = self.execute(code)
self.assertEqual(obj.name, "Joe")
def test_basic_events(self):
code = """
from traits.api import HasTraits, Str
class Test(HasTraits):
name = Str
return Test()
"""
obj = self.execute(code)
with self.assertTraitChanges(obj, "name", count=1):
obj.name = "changing_name"
def test_on_trait_static_handlers(self):
code = """
from traits.api import HasTraits, Str, Int
class Test(HasTraits):
name = Str
value = Int
def _name_changed(self):
self.value += 1
return Test()
"""
obj = self.execute(code)
with self.assertTraitChanges(obj, "value", count=1):
obj.name = "changing_name"
self.assertEqual(obj.value, 1)
def test_on_trait_on_trait_change_decorator(self):
code = """
from traits.api import HasTraits, Str, Int, on_trait_change
class Test(HasTraits):
name = Str
value = Int
@on_trait_change('name')
def _update_value(self):
self.value += 1
return Test()
"""
obj = self.execute(code)
with self.assertTraitChanges(obj, "value", count=1):
obj.name = "changing_name"
self.assertEqual(obj.value, 1)
def test_on_trait_properties(self):
code = """
from traits.api import HasTraits, Str, Int, Property, cached_property
class Test(HasTraits):
name = Str
name_len = Property(depends_on='name')
@cached_property
def _get_name_len(self):
return len(self.name)
return Test()
"""
obj = self.execute(code)
self.assertEqual(obj.name_len, len(obj.name))
# Assert dependency works
obj.name = "Bob"
self.assertEqual(obj.name_len, len(obj.name))
def test_on_trait_properties_with_standard_getter(self):
code = """
from traits.api import HasTraits, Str, Int, Property
class Test(HasTraits):
name = Str
def _get_name_length(self):
return len(self.name)
name_len = Property(_get_name_length)
return Test()
"""
obj = self.execute(code)
self.assertEqual(obj.name_len, len(obj.name))
# Assert dependency works
obj.name = "Bob"
self.assertEqual(obj.name_len, len(obj.name))
def test_on_trait_aliasing(self):
code = """
from traits.api import HasTraits, Str, Int, Property
def Alias(name):
def _get_value(self):
return getattr(self, name)
def _set_value(self, value):
return setattr(self, name, value)
return Property(_get_value, _set_value)
class Test(HasTraits):
name = Str
funky_name = Alias('name')
return Test()
"""
obj = self.execute(code)
self.assertEqual(obj.funky_name, obj.name)
# Assert dependency works
obj.name = "Bob"
self.assertEqual(obj.funky_name, obj.name)
def test_on_trait_aliasing_different_scope(self):
code = """
from traits.api import HasTraits, Str, Int, Property
def _get_value(self, name):
return getattr(self, 'name')
def _set_value(self, name, value):
return setattr(self, 'name', value)
class Test(HasTraits):
name = Str
funky_name = Property(_get_value, _set_value)
return Test()
"""
obj = self.execute(code)
self.assertEqual(obj.funky_name, obj.name)
# Assert dependency works
obj.name = "Bob"
self.assertEqual(obj.funky_name, obj.name)
def execute(self, code):
"""
Helper function to execute the given code under cython.inline and
return the result.
"""
return cython.inline(
code,
force=True,
language_level="3",
)
|
