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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 List items_changed events.
"""
import unittest
from traits.api import HasTraits, Int, List
class MyClass(HasTraits):
l = List(Int, [1, 2, 3])
l_events = List
def _l_items_changed(self, event):
self.l_events.append(event)
class ListEventTestCase(unittest.TestCase):
def test_initialization(self):
# Just creating an instance of MyClass shouldn't cause
# the items_changed handler to fire.
foo = MyClass()
self.assertEqual(foo.l, [1, 2, 3])
self.assertEqual(len(foo.l_events), 0)
def test_append(self):
foo = MyClass()
foo.l.append(4)
self.assertEqual(foo.l, [1, 2, 3, 4])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [4])
self.assertEqual(event.removed, [])
self.assertEqual(event.index, 3)
def test_extend(self):
foo = MyClass()
foo.l.extend([4, 5, 6])
self.assertEqual(foo.l, [1, 2, 3, 4, 5, 6])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [4, 5, 6])
self.assertEqual(event.removed, [])
self.assertEqual(event.index, 3)
def test_extend_via_inplace_addition(self):
foo = MyClass()
foo.l += [4, 5, 6]
self.assertEqual(foo.l, [1, 2, 3, 4, 5, 6])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [4, 5, 6])
self.assertEqual(event.removed, [])
self.assertEqual(event.index, 3)
def test_insert(self):
foo = MyClass()
foo.l.insert(1, 99)
self.assertEqual(foo.l, [1, 99, 2, 3])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [99])
self.assertEqual(event.removed, [])
self.assertEqual(event.index, 1)
def test_insert_with_negative_argument(self):
foo = MyClass()
foo.l.insert(-1, 99)
self.assertEqual(foo.l, [1, 2, 99, 3])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [99])
self.assertEqual(event.removed, [])
self.assertEqual(event.index, 2)
def test_insert_index_invariants(self):
# Note that Python's list.insert allows indices outside
# the range [-len(my_list), len(my_list)].
for index in range(-10, 10):
foo = MyClass()
foo.l.insert(index, 1729)
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [1729])
self.assertEqual(event.removed, [])
self.assertGreaterEqual(event.index, 0)
self.assertEqual(foo.l[event.index], 1729)
def test_pop_with_no_argument(self):
foo = MyClass()
item = foo.l.pop()
self.assertEqual(item, 3)
self.assertEqual(foo.l, [1, 2])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [])
self.assertEqual(event.removed, [3])
self.assertEqual(event.index, 2)
def test_pop(self):
foo = MyClass()
item = foo.l.pop(0)
self.assertEqual(item, 1)
self.assertEqual(foo.l, [2, 3])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [])
self.assertEqual(event.removed, [1])
self.assertEqual(event.index, 0)
def test_pop_with_negative_argument(self):
foo = MyClass()
item = foo.l.pop(-2)
self.assertEqual(item, 2)
self.assertEqual(foo.l, [1, 3])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [])
self.assertEqual(event.removed, [2])
self.assertEqual(event.index, 1)
def test_pop_out_of_range(self):
foo = MyClass()
with self.assertRaises(IndexError):
foo.l.pop(-4)
with self.assertRaises(IndexError):
foo.l.pop(3)
self.assertEqual(foo.l, [1, 2, 3])
self.assertEqual(len(foo.l_events), 0)
def test_remove(self):
foo = MyClass()
foo.l.remove(2)
self.assertEqual(foo.l, [1, 3])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [])
self.assertEqual(event.removed, [2])
self.assertEqual(event.index, 1)
def test_remove_item_not_present(self):
foo = MyClass()
with self.assertRaises(ValueError):
foo.l.remove(1729)
self.assertEqual(foo.l, [1, 2, 3])
self.assertEqual(len(foo.l_events), 0)
def test_inplace_multiply(self):
foo = MyClass()
foo.l *= 2
self.assertEqual(foo.l, [1, 2, 3, 1, 2, 3])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [1, 2, 3])
self.assertEqual(event.removed, [])
self.assertEqual(event.index, 3)
def test_inplace_multiply_by_zero(self):
foo = MyClass()
foo.l *= 0
self.assertEqual(foo.l, [])
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.added, [])
self.assertEqual(event.removed, [1, 2, 3])
self.assertEqual(event.index, 0)
def test_remove_empty_slices(self):
# Test that no events are produced when no items are deleted
foo = MyClass()
# Delete no items and get no events
del foo.l[3:]
self.assertEqual(foo.l, [1, 2, 3])
self.assertEqual(len(foo.l_events), 0)
# Delete all items and get an expected event
del foo.l[:]
self.assertEqual(foo.l, [])
self.assertEqual(len(foo.l_events), 1)
event, = foo.l_events
self.assertEqual(event.added, [])
self.assertEqual(event.removed, [1, 2, 3])
self.assertEqual(event.index, 0)
# Delete no items and get no new events
del foo.l[:]
self.assertEqual(foo.l, [])
self.assertEqual(len(foo.l_events), 1)
def test_remove_empty_slices_steps(self):
foo = MyClass()
# Delete no items and get no events
del foo.l[3::2]
self.assertEqual(foo.l, [1, 2, 3])
self.assertEqual(len(foo.l_events), 0)
def test_clear(self):
foo = MyClass()
foo.l.clear()
self.assertEqual(len(foo.l_events), 1)
event = foo.l_events[0]
self.assertEqual(event.index, 0)
self.assertEqual(event.removed, [1, 2, 3])
self.assertEqual(event.added, [])
def test_clear_empty_list(self):
foo = MyClass()
foo.l = []
foo.l.clear()
self.assertEqual(len(foo.l_events), 0)
def test_delete_step_slice(self):
foo = MyClass()
foo.l = [0, 1, 2, 3, 4]
del foo.l[0:5:2]
self.assertEqual(len(foo.l_events), 1)
event, = foo.l_events
self.assertEqual(event.index, slice(0, 5, 2))
self.assertEqual(event.removed, [0, 2, 4])
self.assertEqual(event.added, [])
def test_delete_step_slice_empty_list(self):
foo = MyClass()
foo.l = []
del foo.l[::-1]
# No items deleted, so no event fired
self.assertEqual(len(foo.l_events), 0)
def test_assignment_step_slice(self):
foo = MyClass()
foo.l = [1, 2, 3]
foo.l[::2] = [3, 4]
self.assertEqual(len(foo.l_events), 1)
event, = foo.l_events
self.assertEqual(event.index, slice(0, 3, 2))
self.assertEqual(event.added, [3, 4])
self.assertEqual(event.removed, [1, 3])
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