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#
# Copyright (c) 2008 Canonical
#
# Written by Marc Tardif <marc@interunion.ca>
#
# This file is part of Checkbox.
#
# Checkbox 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 3 of the License, or
# (at your option) any later version.
#
# Checkbox 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 Checkbox. If not, see <http://www.gnu.org/licenses/>.
#
import unittest
from checkbox.iterator import Iterator
class IteratorTest(unittest.TestCase):
iterator_class = Iterator
def test_empty_iter(self):
i = self.iterator_class()
for element in i:
self.fail('iteration should not start if empty')
def test_empty_has_next(self):
i = self.iterator_class()
self.assertFalse(i.has_next())
def test_empty_next(self):
i = self.iterator_class()
try: i.next()
except StopIteration: pass
else: self.fail('next should raise exception')
def test_empty_has_prev(self):
i = self.iterator_class()
self.assertFalse(i.has_prev())
def test_empty_prev(self):
i = self.iterator_class()
try: i.prev()
except StopIteration: pass
else: self.fail('prev should raise exception')
def test_one_iter(self):
i = self.iterator_class(['a'])
for element in i:
self.assertTrue(element == 'a')
def test_one_has_next(self):
i = self.iterator_class(['a'])
self.assertTrue(i.has_next())
self.assertTrue(i.next() == 'a')
self.assertFalse(i.has_next())
def test_one_next(self):
i = self.iterator_class(['a'])
self.assertTrue(i.next() == 'a')
try: i.next()
except StopIteration: pass
else: self.fail('next should raise exception')
def test_one_has_prev(self):
i = self.iterator_class(['a'])
self.assertFalse(i.has_prev())
self.assertTrue(i.next() == 'a')
self.assertFalse(i.has_prev())
try: i.next()
except StopIteration: pass
else: self.fail('next should raise exception')
self.assertTrue(i.has_prev())
self.assertTrue(i.prev() == 'a')
self.assertFalse(i.has_prev())
def test_one_prev(self):
i = self.iterator_class(['a'])
# next until after last element
self.assertTrue(i.next() == 'a')
try: i.next()
except StopIteration: pass
else: self.fail('next should raise exception')
# prev until before first element
self.assertTrue(i.prev() == 'a')
try: i.prev()
except StopIteration: pass
else: self.fail('prev should raise exception')
def test_two_next(self):
i = self.iterator_class(['a', 'b'])
# next until after last element
self.assertTrue(i.next() == 'a')
self.assertTrue(i.next() == 'b')
try: i.next()
except StopIteration: pass
else: self.fail('next should raise exception')
def test_two_prev(self):
i = self.iterator_class(['a', 'b'])
# next until after last element
self.assertTrue(i.next() == 'a')
self.assertTrue(i.next() == 'b')
try: i.next()
except StopIteration: pass
else: self.fail('next should raise exception')
# prev until before first element
self.assertTrue(i.prev() == 'b')
self.assertTrue(i.prev() == 'a')
try: i.prev()
except StopIteration: pass
else: self.fail('prev should raise exception')
def test_reset_elements(self):
i = self.iterator_class(['a', 'b'])
self.assertTrue(i.next() == 'a')
i = iter(i)
self.assertTrue(i.next() == 'a')
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