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""" Tests to help find out how trait list events work.
These tests exist because when we are using the 'ExtensionPoint' trait type
we try to mimic trait list events when extensions are added or removed.
"""
# Standard library imports.
import unittest
# Enthought library imports.
from enthought.traits.api import HasTraits, List
# The starting list for all tests.
TEST_LIST = [7, 9, 2, 3, 4, 1, 6, 5, 8, 0]
def listener(obj, trait_name, old, event):
""" Recreate a list operation from a trait list event. """
clone = TEST_LIST[:]
# If nothing was added then this is a 'del' or 'remove' operation.
if len(event.added) == 0:
if isinstance(event.index, slice):
del clone[event.index]
else:
del clone[event.index : event.index + len(event.removed)]
# If nothing was removed then it is an 'append', 'insert' or 'extend'
# operation.
elif len(event.removed) == 0:
if isinstance(event.index, slice):
clone[event.index] = event.added[0]
else:
clone.insert(event.index, event.added[0])
# Otherwise, it is an assigment ('sort' and 'reverse' fall into this
# category).
else:
if isinstance(event.index, slice):
clone[event.index] = event.added[0]
else:
clone[event.index : event.index + len(event.added)] = event.added
listener.clone = clone
return
class SliceTestCase(unittest.TestCase):
""" Tests to help find out how trait list events work. """
###########################################################################
# 'TestCase' interface.
###########################################################################
def setUp(self):
""" Prepares the test fixture before each test method is called. """
class Foo(HasTraits):
l = List
self.f = Foo(l=TEST_LIST)
self.f.on_trait_change(listener, 'l_items')
return
def tearDown(self):
""" Called immediately after each test method has been called. """
# Make sure we successfully recreated the operation.
self.assertEqual(self.f.l, listener.clone)
return
###########################################################################
# Tests.
###########################################################################
def test_append(self):
""" append """
self.f.l.append(99)
return
def test_insert(self):
""" insert """
self.f.l.insert(3, 99)
return
def test_extend(self):
""" extend """
self.f.l.append([99, 100])
return
def test_remove(self):
""" remove """
self.f.l.remove(5)
return
def test_reverse(self):
""" reverse """
self.f.l.reverse()
return
def test_sort(self):
""" sort """
self.f.l.sort()
return
def test_pop(self):
""" remove """
self.f.l.pop()
return
def test_del_all(self):
""" del all """
del self.f.l[:]
return
def test_assign_item(self):
""" assign item """
self.f.l[3] = 99
return
def test_del_item(self):
""" del item """
del self.f.l[3]
return
def test_assign_slice(self):
""" assign slice """
self.f.l[2:4] = [88, 99]
return
def test_del_slice(self):
""" del slice """
del self.f.l[2:5]
return
def test_assign_extended_slice(self):
""" assign extended slice """
self.f.l[2:6:2] = [88, 99]
return
def test_del_extended_slice(self):
""" del extended slice """
del self.f.l[2:6:2]
return
# Entry point for stand-alone testing.
if __name__ == '__main__':
unittest.main()
#### EOF ######################################################################
|
