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test_datastructures.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2013 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
Test unit for the miscutil/datastructures module.
"""
from invenio.datastructures import LazyDict, LaziestDict
from invenio.testutils import make_test_suite, run_test_suite, InvenioTestCase
class CallCounter(object):
"""Counts number of calls."""
def __init__(self, populate):
self.counter = 0
self.populate = populate
def __call__(self, *args, **kwargs):
self.counter = self.counter + 1
return self.populate(*args, **kwargs)
class TestLazyDictionaries(InvenioTestCase):
"""
Lazy dictionaries TestSuite.
"""
def test_lazy_dictionary(self):
"""Checks content of lazy dictionary and number of evaluations."""
populate = CallCounter(lambda: {'foo': 'bar', 1: 11, 'empty': None})
lazy_dict = LazyDict(populate)
self.assertEqual(populate.counter, 0)
self.assertEqual(lazy_dict['foo'], 'bar')
self.assertEqual(populate.counter, 1)
self.assertEqual(lazy_dict[1], 11)
self.assertEqual(populate.counter, 1)
self.assertEqual(lazy_dict['empty'], None)
self.assertEqual(populate.counter, 1)
# clear the cache
lazy_dict.expunge()
self.assertEqual(lazy_dict['foo'], 'bar')
self.assertEqual(populate.counter, 2)
def test_lazies_dictionary(self):
populate = CallCounter(lambda k: {'foo': 'bar', 1: 11, 'empty': None}[k])
laziest_dict = LaziestDict(populate)
self.assertEqual(populate.counter, 0)
self.assertEqual(laziest_dict['foo'], 'bar')
self.assertEqual(laziest_dict.keys(), ['foo'])
self.assertEqual(populate.counter, 1)
self.assertEqual(laziest_dict[1], 11)
self.assertEqual(laziest_dict.keys(), [1, 'foo'])
self.assertEqual(populate.counter, 2)
self.assertEqual(laziest_dict['empty'], None)
self.assertEqual(laziest_dict.keys(), [1, 'foo', 'empty'])
self.assertEqual(populate.counter, 3)
# cached result will not cause new call
self.assertEqual(laziest_dict['foo'], 'bar')
self.assertEqual(populate.counter, 3)
# not existing key cause new call (even multiple times)
self.assertEqual(laziest_dict.get('does not exists', -1), -1)
self.assertEqual(populate.counter, 4)
self.assertEqual(laziest_dict.get('does not exists'), None)
self.assertEqual(populate.counter, 5)
TEST_SUITE = make_test_suite(TestLazyDictionaries, )
if __name__ == "__main__":
run_test_suite(TEST_SUITE)

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