1
# Copyright (C) 2009, 2010, 2011 Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
"""Tests for the StaticTupleInterned type."""
24
from breezy.tests import (
29
from breezy import _simple_set_pyx
31
_simple_set_pyx = None
34
class _Hashable(object):
35
"""A simple object which has a fixed hash value.
37
We could have used an 'int', but it turns out that Int objects don't
38
implement tp_richcompare in Python 2.
41
def __init__(self, the_hash):
47
def __eq__(self, other):
48
if not isinstance(other, _Hashable):
50
return other.hash == self.hash
53
class _BadSecondHash(_Hashable):
55
def __init__(self, the_hash):
56
_Hashable.__init__(self, the_hash)
64
raise ValueError('I can only be hashed once.')
67
class _BadCompare(_Hashable):
69
def __eq__(self, other):
70
raise RuntimeError('I refuse to play nice')
72
__hash__ = _Hashable.__hash__
75
class _NoImplementCompare(_Hashable):
77
def __eq__(self, other):
80
__hash__ = _Hashable.__hash__
83
# Even though this is an extension, we don't permute the tests for a python
84
# version. As the plain python version is just a dict or set
85
compiled_simpleset_feature = features.ModuleAvailableFeature(
86
'breezy._simple_set_pyx')
89
class TestSimpleSet(tests.TestCase):
91
_test_needs_features = [compiled_simpleset_feature]
92
module = _simple_set_pyx
94
def assertFillState(self, used, fill, mask, obj):
95
self.assertEqual((used, fill, mask), (obj.used, obj.fill, obj.mask))
97
def assertLookup(self, offset, value, obj, key):
98
self.assertEqual((offset, value), obj._test_lookup(key))
100
def assertRefcount(self, count, obj):
101
"""Assert that the refcount for obj is what we expect.
103
Note that this automatically adjusts for the fact that calling
104
assertRefcount actually creates a new pointer, as does calling
105
sys.getrefcount. So pass the expected value *before* the call.
107
# I'm not sure why the offset is 3, but I've check that in the caller,
108
# an offset of 1 works, which is expected. Not sure why assertRefcount
109
# is incrementing/decrementing 2 times
110
self.assertEqual(count, sys.getrefcount(obj)-3)
112
def test_initial(self):
113
obj = self.module.SimpleSet()
114
self.assertEqual(0, len(obj))
116
self.assertFillState(0, 0, 0x3ff, obj)
118
def test__lookup(self):
119
# These are carefully chosen integers to force hash collisions in the
120
# algorithm, based on the initial set size of 1024
121
obj = self.module.SimpleSet()
122
self.assertLookup(643, '<null>', obj, _Hashable(643))
123
self.assertLookup(643, '<null>', obj, _Hashable(643 + 1024))
124
self.assertLookup(643, '<null>', obj, _Hashable(643 + 50*1024))
126
def test__lookup_collision(self):
127
obj = self.module.SimpleSet()
129
k2 = _Hashable(643 + 1024)
130
self.assertLookup(643, '<null>', obj, k1)
131
self.assertLookup(643, '<null>', obj, k2)
133
self.assertLookup(643, k1, obj, k1)
134
self.assertLookup(644, '<null>', obj, k2)
136
def test__lookup_after_resize(self):
137
obj = self.module.SimpleSet()
139
k2 = _Hashable(643 + 1024)
142
self.assertLookup(643, k1, obj, k1)
143
self.assertLookup(644, k2, obj, k2)
144
obj._py_resize(2047) # resized to 2048
145
self.assertEqual(2048, obj.mask + 1)
146
self.assertLookup(643, k1, obj, k1)
147
self.assertLookup(643+1024, k2, obj, k2)
148
obj._py_resize(1023) # resized back to 1024
149
self.assertEqual(1024, obj.mask + 1)
150
self.assertLookup(643, k1, obj, k1)
151
self.assertLookup(644, k2, obj, k2)
153
def test_get_set_del_with_collisions(self):
154
obj = self.module.SimpleSet()
169
self.assertLookup(643, '<null>', obj, k1)
170
self.assertLookup(643, '<null>', obj, k2)
171
self.assertLookup(643, '<null>', obj, k3)
172
self.assertLookup(643, '<null>', obj, k4)
173
self.assertLookup(644, '<null>', obj, k5)
174
self.assertLookup(644, '<null>', obj, k6)
176
self.assertIn(k1, obj)
177
self.assertNotIn(k2, obj)
178
self.assertNotIn(k3, obj)
179
self.assertNotIn(k4, obj)
180
self.assertLookup(643, k1, obj, k1)
181
self.assertLookup(644, '<null>', obj, k2)
182
self.assertLookup(644, '<null>', obj, k3)
183
self.assertLookup(644, '<null>', obj, k4)
184
self.assertLookup(644, '<null>', obj, k5)
185
self.assertLookup(644, '<null>', obj, k6)
186
self.assertIs(k1, obj[k1])
187
self.assertIs(k2, obj.add(k2))
188
self.assertIs(k2, obj[k2])
189
self.assertLookup(643, k1, obj, k1)
190
self.assertLookup(644, k2, obj, k2)
191
self.assertLookup(646, '<null>', obj, k3)
192
self.assertLookup(646, '<null>', obj, k4)
193
self.assertLookup(645, '<null>', obj, k5)
194
self.assertLookup(645, '<null>', obj, k6)
195
self.assertLookup(643, k1, obj, _Hashable(h1))
196
self.assertLookup(644, k2, obj, _Hashable(h2))
197
self.assertLookup(646, '<null>', obj, _Hashable(h3))
198
self.assertLookup(646, '<null>', obj, _Hashable(h4))
199
self.assertLookup(645, '<null>', obj, _Hashable(h5))
200
self.assertLookup(645, '<null>', obj, _Hashable(h6))
202
self.assertIs(k3, obj[k3])
203
self.assertIn(k1, obj)
204
self.assertIn(k2, obj)
205
self.assertIn(k3, obj)
206
self.assertNotIn(k4, obj)
209
self.assertLookup(643, '<dummy>', obj, k1)
210
self.assertLookup(644, k2, obj, k2)
211
self.assertLookup(646, k3, obj, k3)
212
self.assertLookup(643, '<dummy>', obj, k4)
213
self.assertNotIn(k1, obj)
214
self.assertIn(k2, obj)
215
self.assertIn(k3, obj)
216
self.assertNotIn(k4, obj)
219
obj = self.module.SimpleSet()
220
self.assertFillState(0, 0, 0x3ff, obj)
221
# We use this clumsy notation, because otherwise the refcounts are off.
222
# I'm guessing the python compiler sees it is a static tuple, and adds
223
# it to the function variables, or somesuch
225
self.assertRefcount(1, k1)
226
self.assertIs(k1, obj.add(k1))
227
self.assertFillState(1, 1, 0x3ff, obj)
228
self.assertRefcount(2, k1)
230
self.assertRefcount(3, k1)
231
self.assertIs(k1, ktest)
233
self.assertRefcount(2, k1)
235
self.assertRefcount(1, k2)
236
self.assertIsNot(k1, k2)
237
# doesn't add anything, so the counters shouldn't be adjusted
238
self.assertIs(k1, obj.add(k2))
239
self.assertFillState(1, 1, 0x3ff, obj)
240
self.assertRefcount(2, k1) # not changed
241
self.assertRefcount(1, k2) # not incremented
242
self.assertIs(k1, obj[k1])
243
self.assertIs(k1, obj[k2])
244
self.assertRefcount(2, k1)
245
self.assertRefcount(1, k2)
246
# Deleting an entry should remove the fill, but not the used
248
self.assertFillState(0, 1, 0x3ff, obj)
249
self.assertRefcount(1, k1)
251
self.assertRefcount(1, k3)
252
self.assertIs(k3, obj.add(k3))
253
self.assertFillState(1, 2, 0x3ff, obj)
254
self.assertRefcount(2, k3)
255
self.assertIs(k2, obj.add(k2))
256
self.assertFillState(2, 2, 0x3ff, obj)
257
self.assertRefcount(1, k1)
258
self.assertRefcount(2, k2)
259
self.assertRefcount(2, k3)
261
def test_discard(self):
262
obj = self.module.SimpleSet()
266
self.assertRefcount(1, k1)
267
self.assertRefcount(1, k2)
268
self.assertRefcount(1, k3)
270
self.assertRefcount(2, k1)
271
self.assertEqual(0, obj.discard(k3))
272
self.assertRefcount(1, k3)
274
self.assertRefcount(2, k3)
275
self.assertEqual(1, obj.discard(k3))
276
self.assertRefcount(1, k3)
278
def test__resize(self):
279
obj = self.module.SimpleSet()
280
# Need objects with exact hash as checking offset of <null> later
288
self.assertFillState(2, 3, 0x3ff, obj)
289
self.assertEqual(1024, obj._py_resize(500))
290
# Doesn't change the size, but does change the content
291
self.assertFillState(2, 2, 0x3ff, obj)
294
self.assertFillState(2, 3, 0x3ff, obj)
295
self.assertEqual(4096, obj._py_resize(4095))
296
self.assertFillState(2, 2, 0xfff, obj)
297
self.assertIn(k1, obj)
298
self.assertIn(k2, obj)
299
self.assertNotIn(k3, obj)
301
self.assertIn(k2, obj)
303
self.assertEqual((591, '<dummy>'), obj._test_lookup(k2))
304
self.assertFillState(1, 2, 0xfff, obj)
305
self.assertEqual(2048, obj._py_resize(1024))
306
self.assertFillState(1, 1, 0x7ff, obj)
307
self.assertEqual((591, '<null>'), obj._test_lookup(k2))
309
def test_second_hash_failure(self):
310
obj = self.module.SimpleSet()
311
k1 = _BadSecondHash(200)
313
# Should only call hash() one time
315
self.assertFalse(k1._first)
316
self.assertRaises(ValueError, obj.add, k2)
318
def test_richcompare_failure(self):
319
obj = self.module.SimpleSet()
321
k2 = _BadCompare(200)
323
# Tries to compare with k1, fails
324
self.assertRaises(RuntimeError, obj.add, k2)
326
def test_richcompare_not_implemented(self):
327
obj = self.module.SimpleSet()
328
# Even though their hashes are the same, tp_richcompare returns
329
# NotImplemented, which means we treat them as not equal
330
k1 = _NoImplementCompare(200)
331
k2 = _NoImplementCompare(200)
332
self.assertLookup(200, '<null>', obj, k1)
333
self.assertLookup(200, '<null>', obj, k2)
334
self.assertIs(k1, obj.add(k1))
335
self.assertLookup(200, k1, obj, k1)
336
self.assertLookup(201, '<null>', obj, k2)
337
self.assertIs(k2, obj.add(k2))
338
self.assertIs(k1, obj[k1])
340
def test_add_and_remove_lots_of_items(self):
341
obj = self.module.SimpleSet()
342
chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890'
347
num = len(chars)*len(chars)
348
self.assertFillState(num, num, 0x1fff, obj)
349
# Now delete all of the entries and it should shrink again
354
# It should be back to 1024 wide mask, though there may still be some
355
# dummy values in there
356
self.assertFillState(0, obj.fill, 0x3ff, obj)
357
# but there should be fewer than 1/5th dummy entries
358
self.assertTrue(obj.fill < 1024 / 5)
360
def test__iter__(self):
361
obj = self.module.SimpleSet()
371
self.assertEqual(sorted([k1, k2, k3]), sorted(all))
373
self.assertIn(next(iterator), all)
376
self.assertRaises(RuntimeError, next, iterator)
377
# And even removing an item still causes it to fail
379
self.assertRaises(RuntimeError, next, iterator)
381
def test__sizeof__(self):
382
# SimpleSet needs a custom sizeof implementation, because it allocates
383
# memory that Python cannot directly see (_table).
384
# Too much variability in platform sizes for us to give a fixed size
385
# here. However without a custom implementation, __sizeof__ would give
386
# us only the size of the object, and not its table. We know the table
387
# is at least 4bytes*1024entries in size.
388
obj = self.module.SimpleSet()
389
self.assertTrue(obj.__sizeof__() > 4096)