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# Copyright (C) 2009, 2010, 2011 Canonical Ltd
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Tests for the StaticTupleInterned type."""
import sys
from bzrlib import (
tests,
)
from bzrlib.tests import (
features,
)
try:
from bzrlib import _simple_set_pyx
except ImportError:
_simple_set_pyx = None
class _Hashable(object):
"""A simple object which has a fixed hash value.
We could have used an 'int', but it turns out that Int objects don't
implement tp_richcompare...
"""
def __init__(self, the_hash):
self.hash = the_hash
def __hash__(self):
return self.hash
def __eq__(self, other):
if not isinstance(other, _Hashable):
return NotImplemented
return other.hash == self.hash
class _BadSecondHash(_Hashable):
def __init__(self, the_hash):
_Hashable.__init__(self, the_hash)
self._first = True
def __hash__(self):
if self._first:
self._first = False
return self.hash
else:
raise ValueError('I can only be hashed once.')
class _BadCompare(_Hashable):
def __eq__(self, other):
raise RuntimeError('I refuse to play nice')
class _NoImplementCompare(_Hashable):
def __eq__(self, other):
return NotImplemented
# Even though this is an extension, we don't permute the tests for a python
# version. As the plain python version is just a dict or set
compiled_simpleset_feature = features.ModuleAvailableFeature(
'bzrlib._simple_set_pyx')
class TestSimpleSet(tests.TestCase):
_test_needs_features = [compiled_simpleset_feature]
module = _simple_set_pyx
def assertIn(self, obj, container):
self.assertTrue(obj in container,
'%s not found in %s' % (obj, container))
def assertNotIn(self, obj, container):
self.assertTrue(obj not in container,
'We found %s in %s' % (obj, container))
def assertFillState(self, used, fill, mask, obj):
self.assertEqual((used, fill, mask), (obj.used, obj.fill, obj.mask))
def assertLookup(self, offset, value, obj, key):
self.assertEqual((offset, value), obj._test_lookup(key))
def assertRefcount(self, count, obj):
"""Assert that the refcount for obj is what we expect.
Note that this automatically adjusts for the fact that calling
assertRefcount actually creates a new pointer, as does calling
sys.getrefcount. So pass the expected value *before* the call.
"""
# I'm not sure why the offset is 3, but I've check that in the caller,
# an offset of 1 works, which is expected. Not sure why assertRefcount
# is incrementing/decrementing 2 times
self.assertEqual(count, sys.getrefcount(obj)-3)
def test_initial(self):
obj = self.module.SimpleSet()
self.assertEqual(0, len(obj))
st = ('foo', 'bar')
self.assertFillState(0, 0, 0x3ff, obj)
def test__lookup(self):
# These are carefully chosen integers to force hash collisions in the
# algorithm, based on the initial set size of 1024
obj = self.module.SimpleSet()
self.assertLookup(643, '<null>', obj, _Hashable(643))
self.assertLookup(643, '<null>', obj, _Hashable(643 + 1024))
self.assertLookup(643, '<null>', obj, _Hashable(643 + 50*1024))
def test__lookup_collision(self):
obj = self.module.SimpleSet()
k1 = _Hashable(643)
k2 = _Hashable(643 + 1024)
self.assertLookup(643, '<null>', obj, k1)
self.assertLookup(643, '<null>', obj, k2)
obj.add(k1)
self.assertLookup(643, k1, obj, k1)
self.assertLookup(644, '<null>', obj, k2)
def test__lookup_after_resize(self):
obj = self.module.SimpleSet()
k1 = _Hashable(643)
k2 = _Hashable(643 + 1024)
obj.add(k1)
obj.add(k2)
self.assertLookup(643, k1, obj, k1)
self.assertLookup(644, k2, obj, k2)
obj._py_resize(2047) # resized to 2048
self.assertEqual(2048, obj.mask + 1)
self.assertLookup(643, k1, obj, k1)
self.assertLookup(643+1024, k2, obj, k2)
obj._py_resize(1023) # resized back to 1024
self.assertEqual(1024, obj.mask + 1)
self.assertLookup(643, k1, obj, k1)
self.assertLookup(644, k2, obj, k2)
def test_get_set_del_with_collisions(self):
obj = self.module.SimpleSet()
h1 = 643
h2 = 643 + 1024
h3 = 643 + 1024*50
h4 = 643 + 1024*25
h5 = 644
h6 = 644 + 1024
k1 = _Hashable(h1)
k2 = _Hashable(h2)
k3 = _Hashable(h3)
k4 = _Hashable(h4)
k5 = _Hashable(h5)
k6 = _Hashable(h6)
self.assertLookup(643, '<null>', obj, k1)
self.assertLookup(643, '<null>', obj, k2)
self.assertLookup(643, '<null>', obj, k3)
self.assertLookup(643, '<null>', obj, k4)
self.assertLookup(644, '<null>', obj, k5)
self.assertLookup(644, '<null>', obj, k6)
obj.add(k1)
self.assertIn(k1, obj)
self.assertNotIn(k2, obj)
self.assertNotIn(k3, obj)
self.assertNotIn(k4, obj)
self.assertLookup(643, k1, obj, k1)
self.assertLookup(644, '<null>', obj, k2)
self.assertLookup(644, '<null>', obj, k3)
self.assertLookup(644, '<null>', obj, k4)
self.assertLookup(644, '<null>', obj, k5)
self.assertLookup(644, '<null>', obj, k6)
self.assertIs(k1, obj[k1])
self.assertIs(k2, obj.add(k2))
self.assertIs(k2, obj[k2])
self.assertLookup(643, k1, obj, k1)
self.assertLookup(644, k2, obj, k2)
self.assertLookup(646, '<null>', obj, k3)
self.assertLookup(646, '<null>', obj, k4)
self.assertLookup(645, '<null>', obj, k5)
self.assertLookup(645, '<null>', obj, k6)
self.assertLookup(643, k1, obj, _Hashable(h1))
self.assertLookup(644, k2, obj, _Hashable(h2))
self.assertLookup(646, '<null>', obj, _Hashable(h3))
self.assertLookup(646, '<null>', obj, _Hashable(h4))
self.assertLookup(645, '<null>', obj, _Hashable(h5))
self.assertLookup(645, '<null>', obj, _Hashable(h6))
obj.add(k3)
self.assertIs(k3, obj[k3])
self.assertIn(k1, obj)
self.assertIn(k2, obj)
self.assertIn(k3, obj)
self.assertNotIn(k4, obj)
obj.discard(k1)
self.assertLookup(643, '<dummy>', obj, k1)
self.assertLookup(644, k2, obj, k2)
self.assertLookup(646, k3, obj, k3)
self.assertLookup(643, '<dummy>', obj, k4)
self.assertNotIn(k1, obj)
self.assertIn(k2, obj)
self.assertIn(k3, obj)
self.assertNotIn(k4, obj)
def test_add(self):
obj = self.module.SimpleSet()
self.assertFillState(0, 0, 0x3ff, obj)
# We use this clumsy notation, because otherwise the refcounts are off.
# I'm guessing the python compiler sees it is a static tuple, and adds
# it to the function variables, or somesuch
k1 = tuple(['foo'])
self.assertRefcount(1, k1)
self.assertIs(k1, obj.add(k1))
self.assertFillState(1, 1, 0x3ff, obj)
self.assertRefcount(2, k1)
ktest = obj[k1]
self.assertRefcount(3, k1)
self.assertIs(k1, ktest)
del ktest
self.assertRefcount(2, k1)
k2 = tuple(['foo'])
self.assertRefcount(1, k2)
self.assertIsNot(k1, k2)
# doesn't add anything, so the counters shouldn't be adjusted
self.assertIs(k1, obj.add(k2))
self.assertFillState(1, 1, 0x3ff, obj)
self.assertRefcount(2, k1) # not changed
self.assertRefcount(1, k2) # not incremented
self.assertIs(k1, obj[k1])
self.assertIs(k1, obj[k2])
self.assertRefcount(2, k1)
self.assertRefcount(1, k2)
# Deleting an entry should remove the fill, but not the used
obj.discard(k1)
self.assertFillState(0, 1, 0x3ff, obj)
self.assertRefcount(1, k1)
k3 = tuple(['bar'])
self.assertRefcount(1, k3)
self.assertIs(k3, obj.add(k3))
self.assertFillState(1, 2, 0x3ff, obj)
self.assertRefcount(2, k3)
self.assertIs(k2, obj.add(k2))
self.assertFillState(2, 2, 0x3ff, obj)
self.assertRefcount(1, k1)
self.assertRefcount(2, k2)
self.assertRefcount(2, k3)
def test_discard(self):
obj = self.module.SimpleSet()
k1 = tuple(['foo'])
k2 = tuple(['foo'])
k3 = tuple(['bar'])
self.assertRefcount(1, k1)
self.assertRefcount(1, k2)
self.assertRefcount(1, k3)
obj.add(k1)
self.assertRefcount(2, k1)
self.assertEqual(0, obj.discard(k3))
self.assertRefcount(1, k3)
obj.add(k3)
self.assertRefcount(2, k3)
self.assertEqual(1, obj.discard(k3))
self.assertRefcount(1, k3)
def test__resize(self):
obj = self.module.SimpleSet()
k1 = ('foo',)
k2 = ('bar',)
k3 = ('baz',)
obj.add(k1)
obj.add(k2)
obj.add(k3)
obj.discard(k2)
self.assertFillState(2, 3, 0x3ff, obj)
self.assertEqual(1024, obj._py_resize(500))
# Doesn't change the size, but does change the content
self.assertFillState(2, 2, 0x3ff, obj)
obj.add(k2)
obj.discard(k3)
self.assertFillState(2, 3, 0x3ff, obj)
self.assertEqual(4096, obj._py_resize(4095))
self.assertFillState(2, 2, 0xfff, obj)
self.assertIn(k1, obj)
self.assertIn(k2, obj)
self.assertNotIn(k3, obj)
obj.add(k2)
self.assertIn(k2, obj)
obj.discard(k2)
self.assertEqual((591, '<dummy>'), obj._test_lookup(k2))
self.assertFillState(1, 2, 0xfff, obj)
self.assertEqual(2048, obj._py_resize(1024))
self.assertFillState(1, 1, 0x7ff, obj)
self.assertEqual((591, '<null>'), obj._test_lookup(k2))
def test_second_hash_failure(self):
obj = self.module.SimpleSet()
k1 = _BadSecondHash(200)
k2 = _Hashable(200)
# Should only call hash() one time
obj.add(k1)
self.assertFalse(k1._first)
self.assertRaises(ValueError, obj.add, k2)
def test_richcompare_failure(self):
obj = self.module.SimpleSet()
k1 = _Hashable(200)
k2 = _BadCompare(200)
obj.add(k1)
# Tries to compare with k1, fails
self.assertRaises(RuntimeError, obj.add, k2)
def test_richcompare_not_implemented(self):
obj = self.module.SimpleSet()
# Even though their hashes are the same, tp_richcompare returns
# NotImplemented, which means we treat them as not equal
k1 = _NoImplementCompare(200)
k2 = _NoImplementCompare(200)
self.assertLookup(200, '<null>', obj, k1)
self.assertLookup(200, '<null>', obj, k2)
self.assertIs(k1, obj.add(k1))
self.assertLookup(200, k1, obj, k1)
self.assertLookup(201, '<null>', obj, k2)
self.assertIs(k2, obj.add(k2))
self.assertIs(k1, obj[k1])
def test_add_and_remove_lots_of_items(self):
obj = self.module.SimpleSet()
chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890'
for i in chars:
for j in chars:
k = (i, j)
obj.add(k)
num = len(chars)*len(chars)
self.assertFillState(num, num, 0x1fff, obj)
# Now delete all of the entries and it should shrink again
for i in chars:
for j in chars:
k = (i, j)
obj.discard(k)
# It should be back to 1024 wide mask, though there may still be some
# dummy values in there
self.assertFillState(0, obj.fill, 0x3ff, obj)
# but there should be fewer than 1/5th dummy entries
self.assertTrue(obj.fill < 1024 / 5)
def test__iter__(self):
obj = self.module.SimpleSet()
k1 = ('1',)
k2 = ('1', '2')
k3 = ('3', '4')
obj.add(k1)
obj.add(k2)
obj.add(k3)
all = set()
for key in obj:
all.add(key)
self.assertEqual(sorted([k1, k2, k3]), sorted(all))
iterator = iter(obj)
iterator.next()
obj.add(('foo',))
# Set changed size
self.assertRaises(RuntimeError, iterator.next)
# And even removing an item still causes it to fail
obj.discard(k2)
self.assertRaises(RuntimeError, iterator.next)
def test__sizeof__(self):
# SimpleSet needs a custom sizeof implementation, because it allocates
# memory that Python cannot directly see (_table).
# Too much variability in platform sizes for us to give a fixed size
# here. However without a custom implementation, __sizeof__ would give
# us only the size of the object, and not its table. We know the table
# is at least 4bytes*1024entries in size.
obj = self.module.SimpleSet()
self.assertTrue(obj.__sizeof__() > 4096)
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