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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 unittest
from traits.api import Array, Bool, HasTraits, TraitError
from traits.testing.optional_dependencies import numpy, requires_numpy
if numpy is not None:
# Use of `Array` requires NumPy to be installed.
class Foo(HasTraits):
a = Array()
event_fired = Bool(False)
def _a_changed(self):
self.event_fired = True
@requires_numpy
class ArrayTestCase(unittest.TestCase):
""" Test cases for delegated traits. """
def test_zero_to_one_element(self):
""" Test that an event fires when an Array trait changes from zero to
one element.
"""
f = Foo()
f.a = numpy.zeros((2,), float)
f.event_fired = False
# Change the array.
f.a = numpy.concatenate((f.a, numpy.array([100])))
# Confirm that the static trait handler was invoked.
self.assertEqual(f.event_fired, True)
def test_safe_casting(self):
class Bar(HasTraits):
unsafe_f32 = Array(dtype="float32")
safe_f32 = Array(dtype="float32", casting="safe")
f64 = numpy.array([1], dtype="float64")
f32 = numpy.array([1], dtype="float32")
b = Bar()
b.unsafe_f32 = f32
b.unsafe_f32 = f64
b.safe_f32 = f32
with self.assertRaises(TraitError):
b.safe_f32 = f64
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