/usr/lib/python2.7/dist-packages/traits/tests/test_list.py is in python-traits 4.6.0-1.
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# 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
from __future__ import absolute_import
import sys
from traits.testing.unittest_tools import unittest
from ..api import CList, HasTraits, Instance, Int, List, Str, TraitError
class Foo(HasTraits):
l = List(Str)
class Bar(HasTraits):
name = Str
class Baz(HasTraits):
bars = List(Bar)
class BazRef(HasTraits):
bars = List(Bar, copy='ref')
class DeepBaz(HasTraits):
baz = Instance(Baz)
class DeepBazBazRef(HasTraits):
baz = Instance(BazRef)
class CFoo(HasTraits):
ints = CList(Int)
strs = CList(Str)
class ListTestCase(unittest.TestCase):
def test_initialized(self):
f = Foo()
self.assertNotEqual(f.l, None)
self.assertEqual(len(f.l), 0)
return
def test_initializer(self):
f = Foo(l=['a', 'list'])
self.assertNotEqual(f.l, None)
self.assertEqual(f.l, ['a', 'list'])
return
def test_type_check(self):
f = Foo()
f.l.append('string')
self.assertRaises(TraitError, f.l.append, 123.456)
return
def test_append(self):
f = Foo()
f.l.append('bar')
self.assertEqual(f.l, ['bar'])
return
def test_remove(self):
f = Foo()
f.l.append('bar')
f.l.remove('bar')
self.assertEqual(f.l, [])
return
def test_slice(self):
f = Foo(l=['zero', 'one', 'two', 'three'])
self.assertEqual(f.l[0], 'zero')
self.assertEqual(f.l[:0], [])
self.assertEqual(f.l[:1], ['zero'])
self.assertEqual(f.l[0:1], ['zero'])
self.assertEqual(f.l[1:], ['one', 'two', 'three'])
self.assertEqual(f.l[-1], 'three')
self.assertEqual(f.l[-2], 'two')
self.assertEqual(f.l[:-1], ['zero', 'one', 'two'])
return
def test_slice_assignment(self):
# Exhaustive testing.
starts = stops = [None] + range(-10, 11)
steps = list(starts)
steps.remove(0)
test_slices = [slice(start, stop, step)
for start in starts for stop in stops for step in steps]
for test_slice in test_slices:
f = Foo(l=['zero', 'one', 'two', 'three', 'four'])
plain_l = list(f.l)
length = len(plain_l[test_slice])
replacements = map(str, range(length))
# Plain Python list and Traits list behaviour should match.
plain_l[test_slice] = replacements
f.l[test_slice] = replacements
self.assertEqual(
f.l, plain_l, "failed for slice {0!r}".format(test_slice))
def test_slice_assignments_of_different_length(self):
# Test slice assignments where rhs has a different length
# to the slice. These should work only for slices of step 1.
test_list = ['zero', 'one', 'two', 'three']
f = Foo(l=test_list)
f.l[1:3] = '01234'
self.assertEqual(f.l, ['zero', '0', '1', '2', '3', '4', 'three'])
f.l[4:] = []
self.assertEqual(f.l, ['zero', '0', '1', '2'])
f.l[:] = 'abcde'
self.assertEqual(f.l, ['a', 'b', 'c', 'd', 'e'])
f.l[:] = []
self.assertEqual(f.l, [])
f = Foo(l=test_list)
with self.assertRaises(ValueError):
f.l[::2] = ['a', 'b', 'c']
self.assertEqual(f.l, test_list)
with self.assertRaises(ValueError):
f.l[::-1] = []
self.assertEqual(f.l, test_list)
def test_slice_deletion_bad_length_computation(self):
# Regression test for enthought/traits#283.
class IHasConstrainedList(HasTraits):
foo = List(Str, minlen=3)
f = IHasConstrainedList(foo=['zero', 'one', 'two', 'three'])
# We're deleting two items; this should raise.
with self.assertRaises(TraitError):
del f.foo[::3]
def test_retrieve_reference(self):
f = Foo(l=['initial', 'value'])
l = f.l
self.assertIs(l, f.l)
# no copy on change behavior, l is always a reference
l.append('change')
self.assertEqual(f.l, ['initial', 'value', 'change'])
f.l.append('more change')
self.assertEqual(l, ['initial', 'value', 'change', 'more change'])
return
def test_assignment_makes_copy(self):
f = Foo(l=['initial', 'value'])
l = ['new']
f.l = l
# same content
self.assertEqual(l, f.l)
# different objects
self.assertIsNot(l, f.l)
# which means behaviorally...
l.append('l change')
self.assertNotIn('l change', f.l)
f.l.append('f.l change')
self.assertNotIn('f.l change', l)
return
def test_should_not_allow_none(self):
f = Foo(l=['initial', 'value'])
try:
f.l = None
self.fail('None assigned to List trait.')
except TraitError:
pass
def test_clone(self):
baz = Baz()
for name in ['a', 'b', 'c', 'd']:
baz.bars.append(Bar(name=name))
# Clone will clone baz, the bars list, and the objects in the list
baz_copy = baz.clone_traits()
self.assertIsNot(baz_copy, baz)
self.assertIsNot(baz_copy.bars, baz.bars)
self.assertEqual(len(baz_copy.bars), len(baz.bars))
for bar in baz.bars:
self.assertNotIn(bar, baz_copy.bars)
baz_bar_names = [bar.name for bar in baz.bars]
baz_copy_bar_names = [bar.name for bar in baz_copy.bars]
baz_bar_names.sort()
baz_copy_bar_names.sort()
self.assertEqual(baz_copy_bar_names, baz_bar_names)
return
def test_clone_ref(self):
baz = BazRef()
for name in ['a', 'b', 'c', 'd']:
baz.bars.append(Bar(name=name))
# Clone will clone baz, the bars list, but the objects in the list
# will not be cloned because the copy metatrait of the List is 'ref'
baz_copy = baz.clone_traits()
self.assertIsNot(baz_copy, baz)
self.assertIsNot(baz_copy.bars, baz.bars)
self.assertEqual(len(baz_copy.bars), len(baz.bars))
for bar in baz.bars:
self.assertIn(bar, baz_copy.bars)
return
def test_clone_deep_baz(self):
baz = Baz()
for name in ['a', 'b', 'c', 'd']:
baz.bars.append(Bar(name=name))
deep_baz = DeepBaz(baz=baz)
# Clone will clone deep_baz, deep_baz.baz, the bars list,
# and the objects in the list
deep_baz_copy = deep_baz.clone_traits()
self.assertIsNot(deep_baz_copy, deep_baz)
self.assertIsNot(deep_baz_copy.baz, deep_baz.baz)
baz_copy = deep_baz_copy.baz
self.assertIsNot(baz_copy, baz)
self.assertIsNot(baz_copy.bars, baz.bars)
self.assertEqual(len(baz_copy.bars), len(baz.bars))
for bar in baz.bars:
self.assertNotIn(bar, baz_copy.bars)
baz_bar_names = [bar.name for bar in baz.bars]
baz_copy_bar_names = [bar.name for bar in baz_copy.bars]
baz_bar_names.sort()
baz_copy_bar_names.sort()
self.assertEqual(baz_copy_bar_names, baz_bar_names)
return
def test_clone_deep_baz_ref(self):
baz = BazRef()
for name in ['a', 'b', 'c', 'd']:
baz.bars.append(Bar(name=name))
deep_baz = DeepBazBazRef(baz=baz)
deep_baz_copy = deep_baz.clone_traits()
self.assertIsNot(deep_baz_copy, deep_baz)
self.assertIsNot(deep_baz_copy.baz, deep_baz.baz)
baz_copy = deep_baz_copy.baz
self.assertIsNot(baz_copy, baz)
self.assertIsNot(baz_copy.bars, baz.bars)
self.assertEqual(len(baz_copy.bars), len(baz.bars))
for bar in baz.bars:
self.assertIn(bar, baz_copy.bars)
return
def test_coercion(self):
f = CFoo()
# Test coercion from basic built-in types
f.ints = [1, 2, 3]
desired = [1, 2, 3]
self.assertEqual(f.ints, desired)
f.ints = (1, 2, 3)
self.assertEqual(f.ints, desired)
f.strs = ("abc", "def", "ghi")
self.assertEqual(f.strs, ["abc", "def", "ghi"])
f.strs = "abcdef"
self.assertEqual(f.strs, list("abcdef"))
try:
from numpy import array
except ImportError:
pass
else:
if sys.version_info[0] < 3:
f.ints = array([1, 2, 3])
self.assertEqual(f.ints, [1, 2, 3])
else:
# These would fail due to np.int_ being an invalid vallue
# for the Int-trait.
pass
f.strs = array(("abc", "def", "ghi"))
self.assertEqual(f.strs, ["abc", "def", "ghi"])
def test_extend(self):
f = Foo()
f.l = ['4', '5', '6']
f.l.extend(['1', '2', '3'])
self.assertEqual(f.l, ['4', '5', '6', '1', '2', '3'])
def test_iadd(self):
f = Foo()
f.l = ['4', '5', '6']
f.l += ['1', '2', '3']
self.assertEqual(f.l, ['4', '5', '6', '1', '2', '3'])
def test_imul(self):
f = Foo()
f.l = list('123')
f.l *= 4
self.assertEqual(f.l, list('123123123123'))
def test_sort_no_args(self):
f = Foo()
f.l = ["a", "c", "b", "d"]
f.l.sort()
self.assertEqual(f.l, ["a", "b", "c", "d"])
def test_sort_key(self):
f = Foo()
f.l = ["a", "c", "b", "d"]
f.l.sort(key=lambda x: -ord(x))
self.assertEqual(f.l, ["d", "c", "b", "a"])
def test_sort_reverse(self):
f = Foo()
f.l = ["a", "c", "b", "d"]
f.l.sort(reverse=True)
self.assertEqual(f.l, ["d", "c", "b", "a"])
def test_sort_key_reverse(self):
f = Foo()
f.l = ["a", "c", "b", "d"]
f.l.sort(key=lambda x: -ord(x), reverse=True)
self.assertEqual(f.l, ["a", "b", "c", "d"])
@unittest.skipIf(sys.version_info[0] >= 3, "Not for Python 3")
def test_sort_cmp(self):
f = Foo()
f.l = ["a", "c", "b", "d"]
f.l.sort(cmp=lambda x, y: ord(x) - ord(y))
self.assertEqual(f.l, ["a", "b", "c", "d"])
@unittest.skipIf(sys.version_info[0] < 3, "Not for Python 2")
def test_sort_cmp_error(self):
f = Foo()
f.l = ["a", "c", "b", "d"]
with self.assertRaises(TypeError):
f.l.sort(cmp=lambda x, y: ord(x) - ord(y))
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