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##############################################################################
#
# Copyright (c) 2005 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
""" Tests for zope.tales.expressions.simpleTraverse
"""
from unittest import TestCase
from zope.tales.expressions import simpleTraverse
class AttrTraversable(object):
"""Traversable by attribute access"""
attr = 'foo'
class ItemTraversable(object):
"""Traversable by item access"""
def __getitem__(self, name):
if name == 'attr':
return 'foo'
raise KeyError(name)
class AllTraversable(AttrTraversable, ItemTraversable):
"""Traversable by attribute and item access"""
pass
_marker = object()
def getitem(ob, name, default=_marker):
"""Helper a la getattr(ob, name, default)."""
try:
item = ob[name]
except KeyError:
if default is not _marker:
return default
raise KeyError(name)
else:
return item
class TraverserTests(TestCase):
def testGetItem(self):
# getitem helper should behave like __getitem__
ob = {'attr': 'foo'}
self.assertEqual(getitem(ob, 'attr', None), 'foo')
self.assertEqual(getitem(ob, 'attr'), 'foo')
self.assertEqual(getitem(ob, 'missing_attr', None), None)
self.assertRaises(KeyError, getitem, ob, 'missing_attr')
self.assertRaises(TypeError, getitem, object(), 'attr')
def testAttrTraversable(self):
# An object without __getitem__ should raise AttributeError
# for missing attribute.
ob = AttrTraversable()
self.assertEqual(getattr(ob, 'attr', None), 'foo')
self.assertRaises(AttributeError, getattr, ob, 'missing_attr')
def testItemTraversable(self):
# An object with __getitem__ (but without attr) should raise
# KeyError for missing attribute.
ob = ItemTraversable()
self.assertEqual(getitem(ob, 'attr', None), 'foo')
self.assertRaises(KeyError, getitem, ob, 'missing_attr')
def testAllTraversable(self):
# An object with attr and __getitem__ should raise either
# exception, depending on method of access.
ob = AllTraversable()
self.assertEqual(getattr(ob, 'attr', None), 'foo')
self.assertRaises(AttributeError, getattr, ob, 'missing_attr')
self.assertEqual(getitem(ob, 'attr', None), 'foo')
self.assertRaises(KeyError, getitem, ob, 'missing_attr')
def testTraverseEmptyPath(self):
# simpleTraverse should return the original object if the path is empty
ob = object()
self.assertEqual(simpleTraverse(ob, [], None), ob)
def testTraverseByAttr(self):
# simpleTraverse should find attr through attribute access
ob = AttrTraversable()
self.assertEqual(simpleTraverse(ob, ['attr'], None), 'foo')
def testTraverseByMissingAttr(self):
# simpleTraverse should raise AttributeError
ob = AttrTraversable()
# Here lurks the bug (unexpected NamError raised)
self.assertRaises(
AttributeError, simpleTraverse, ob, ['missing_attr'], None)
def testTraverseByItem(self):
# simpleTraverse should find attr through item access
ob = ItemTraversable()
self.assertEqual(simpleTraverse(ob, ['attr'], None), 'foo')
def testTraverseByMissingItem(self):
# simpleTraverse should raise KeyError
ob = ItemTraversable()
self.assertRaises(KeyError, simpleTraverse, ob, ['missing_attr'], None)
def testTraverseByAll(self):
# simpleTraverse should find attr through attribute access
ob = AllTraversable()
self.assertEqual(simpleTraverse(ob, ['attr'], None), 'foo')
def testTraverseByMissingAll(self):
# simpleTraverse should raise KeyError (because ob implements
# __getitem__)
ob = AllTraversable()
self.assertRaises(KeyError, simpleTraverse, ob, ['missing_attr'], None)
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