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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!
import pickle
import unittest
from traits.api import Expression, HasTraits, Int, TraitError
from traits.constants import DefaultValue
class TestExpression(unittest.TestCase):
def test_set_value(self):
class Foo(HasTraits):
bar = Expression()
f = Foo()
f.bar = "1"
self.assertEqual(f.bar, "1")
self.assertEqual(eval(f.bar_), 1)
def test_default_static(self):
class Foo(HasTraits):
# The default value set in the class definition is "0"
bar = Expression(default_value="1")
f = Foo()
self.assertEqual(f.bar, "1")
self.assertEqual(eval(f.bar_), 1)
def test_default_method(self):
class Foo(HasTraits):
# The default value set in the class definition is "0"
bar = Expression()
default_calls = Int(0)
def _bar_default(self):
self.default_calls += 1
return "1"
f = Foo()
self.assertEqual(f.bar, "1")
self.assertEqual(eval(f.bar_), 1)
self.assertEqual(f.default_calls, 1)
# Check that the order doesn't matter
f2 = Foo()
self.assertEqual(eval(f2.bar_), 1)
self.assertEqual(f2.bar, "1")
self.assertEqual(f2.default_calls, 1)
def test_default_method_non_valid(self):
class Foo(HasTraits):
bar = Expression()
def _bar_default(self):
return "{x=y"
f = Foo()
msg = "The 'bar' trait of a Foo instance must be a valid"
with self.assertRaisesRegex(TraitError, msg):
f.bar
def test_default_static_override_static(self):
class BaseFoo(HasTraits):
# The default value set in the class definition is "0"
bar = Expression()
class Foo(BaseFoo):
bar = "3"
f = Foo()
self.assertEqual(f.bar, "3")
self.assertEqual(eval(f.bar_), 3)
def test_default_static_override_method(self):
class BaseFoo(HasTraits):
# The default value set in the class definition is "0"
bar = Expression()
class Foo(BaseFoo):
default_calls = Int(0)
def _bar_default(self):
self.default_calls += 1
return "3"
f = Foo()
self.assertEqual(f.bar, "3")
self.assertEqual(eval(f.bar_), 3)
self.assertEqual(f.default_calls, 1)
def test_default_method_override_static(self):
class BaseFoo(HasTraits):
# The default value set in the class definition is "0"
bar = Expression()
default_calls = Int(0)
def _bar_default(self):
self.default_calls += 1
return "1"
class Foo(BaseFoo):
bar = "3"
f = Foo()
self.assertEqual(f.bar, "3")
self.assertEqual(eval(f.bar_), 3)
self.assertEqual(f.default_calls, 0)
def test_default_method_override_method(self):
class BaseFoo(HasTraits):
# The default value set in the class definition is "0"
bar = Expression()
default_calls = Int(0)
def _bar_default(self):
self.default_calls += 1
return "1"
class Foo(BaseFoo):
def _bar_default(self):
self.default_calls += 1
return "3"
f = Foo()
self.assertEqual(f.bar, "3")
self.assertEqual(eval(f.bar_), 3)
self.assertEqual(f.default_calls, 1)
def test_pickle_shadow_trait(self):
class Foo(HasTraits):
# The default value set in the class definition is "0"
bar = Expression(default_value="1")
f = Foo()
married_shadow_trait = f.trait("bar_")
reconstituted = pickle.loads(pickle.dumps(married_shadow_trait))
default_value_callable = reconstituted.default_value()[1]
self.assertEqual(eval(default_value_callable(f)), 1)
def test_clone(self):
expr = Expression(default_value="1")
cloned_expr = expr.clone("2")
self.assertEqual(cloned_expr.default_value_type, DefaultValue.constant)
self.assertEqual(cloned_expr.default_value, "2")
self.assertEqual(
cloned_expr.as_ctrait().default_value_for(None, "expr"),
"2",
)
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