/usr/lib/python2.7/dist-packages/traits/tests/test_sync_traits.py is in python-traits 4.5.0-1ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 | """ Test that the `sync_trait` member function of `HasTraits` instances
functions correctly.
"""
from __future__ import absolute_import
from traits.testing.unittest_tools import unittest, UnittestTools
from ..api import HasTraits, Int, List
class A(HasTraits):
t = Int
l = List(Int)
class B(HasTraits):
t = Int
u = Int
l = List(Int)
class TestSyncTraits(unittest.TestCase, UnittestTools):
def test_mutual_sync(self):
""" Test that two traits can be mutually synchronized.
"""
a = A()
b = B()
a.sync_trait('t', b)
b.t = 10
self.assertEqual(a.t, b.t)
a.t = 20
self.assertEqual(b.t, a.t)
# Check that we can remove the synchronization
a.sync_trait('t', b, remove=True)
with self.assertTraitDoesNotChange(a, 't'):
b.t = 5
with self.assertTraitDoesNotChange(b, 't'):
a.t = 7
def test_sync_alias(self):
""" Test synchronization of a trait with an aliased trait.
"""
a = A()
b = B()
a.sync_trait('t', b, 'u')
with self.assertTraitDoesNotChange(b, 't'):
a.t = 5
self.assertEqual(a.t, b.u)
b.u = 7
self.assertEqual(a.t, b.u)
def test_one_way_sync(self):
""" Test one-way synchronization of two traits.
"""
a = A(t=3)
b = B(t=4)
a.sync_trait('t', b, mutual=False)
self.assertEqual(b.t, 3)
a.t = 5
self.assertEqual(b.t, a.t)
with self.assertTraitDoesNotChange(a, 't'):
b.t = 7
# Remove synchronization
a.sync_trait('t', b, remove=True)
with self.assertTraitDoesNotChange(b, 't'):
a.t = 12
def test_sync_lists(self):
""" Test synchronization of list traits.
"""
a = A()
b = B()
a.sync_trait('l', b)
# Change entire list.
a.l = [1, 2, 3]
self.assertEqual(a.l, b.l)
b.l = [4, 5]
self.assertEqual(a.l, b.l)
# Change list items.
a.l = [7, 8, 9]
with self.assertTraitChanges(b, 'l_items'):
a.l[-1] = 20
self.assertEqual(b.l, [7, 8, 20])
# Remove synchronization
a.sync_trait('l', b, remove=True)
with self.assertTraitDoesNotChange(a, 'l'):
b.l = [7, 8]
def test_sync_delete(self):
""" Test that deleting a synchronized trait works.
"""
a = A()
b = B()
a.sync_trait('t', b)
a.t = 5
del a
try:
# Updating `b.t` should not raise an exception due to remaining
# listeners.
b.t = 7
except Exception:
self.fail("Unexpected exception while setting sync trait.")
if __name__ == '__main__':
unittest.main()
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