bigmem tests tests for the 32bit boundary in containers these tests try to exercise the 32bit boundary that is sometimes if rarely exceeded in practice but almost never tested they are really only meaningful on 64bit builds on machines with a lot of memory but the tests are always run usually with very low memory limits to make sure the tests themselves don t suffer from bitrot to run them for real pass a high memory limit to regrtest with the m option these tests all use one of the bigmemtest decorators to indicate how much memory they use and how much memory they need to be even meaningful the decorators take two arguments a memuse indicator declaring approximate bytes per sizeunit the test will use at peak usage and a minsize indicator declaring a minimum useful size a test that allocates a bytestring to test various operations near the end will have a minsize of at least 2gb or it wouldn t reach the 32bit limit so the test wouldn t be very useful and a memuse of 1 one byte per sizeunit if it allocates only one big string at a time when run with a memory limit set both decorators skip tests that need more memory than available to be meaningful the precisionbigmemtest will always pass minsize as size even if there is much more memory available the bigmemtest decorator will scale size upward to fill available memory bigmem testing houserules try not to allocate too many large objects it s okay to rely on refcounting semantics and don t forget that s createlargestring doesn t release the old s if it exists until well after its new value has been created use del s before the createlargestring call do not compare large objects using assertequal assertin or similar it s a lengthy operation and the errormessage will be utterly useless due to its size to make sure whether a result has the right contents better to use the strip or count methods or compare meaningful slices don t forget to test for large indices offsets and results and such in addition to large sizes anything that probes the 32bit boundary when repeating an object say a substring or a small list to create a large object make the subobject of a length that is not a power of 2 that way intwrapping problems are more easily detected despite the bigmemtest decorator all tests will actually be called with a much smaller number too in the normal test run 5kb currently this is so the tests themselves get frequent testing consequently always make all large allocations based on the passedin size and don t rely on the size being very large also memusepersize should remain sane less than a few thousand if your test uses more adjust size upward instead beware it seems that one failing test can yield other subsequent tests to fail as well i do not know whether it is due to memory fragmentation issues or other specifics of the platform malloc routine typespecific optimization typespecific optimization the test takes about size bytes to build a string and then about sqrtsize substrings of sqrtsize in size and a list to hold sqrtsize items it s close but just over 2x size crudely calculate an estimate so that the result of s split won t take up an inordinate amount of memory allocates a string of twice size and briefly two and a list of size because of internal affairs the s split call produces a list of size times the same onecharacter string so we only suffer for the list size otherwise it d cost another 48 times size in bytes nevertheless a list of size takes 8size bytes crudely calculate an estimate so that the result of s split won t take up an inordinate amount of memory this test is meaningful even with size 2g as long as the doubled string is 2g but it tests more if both are 2g this test is meaningful even with size 2g as long as the repeated string is 2g but it tests more if both are 2g make sure we do some slicing and indexing near the end of the string too not sure if we can do any meaningful tests here even if we start relying on the exact algorithm used the result will be different depending on the size of the c long int even this test is dodgy there s no guarantee that the two things should have a different hash even if they in the current implementation almost always do hack adjust memory use of tests inherited from basestrtest according to character size many codecs convert to the legacy representation first explaining why we add ucs4charsize to the memuse below str uses a pyucs4 intermediate representation repr will create a string four times as large as this binary string but we don t want to allocate much more than twice size in total we do extra testing in testreprlarge ascii calls encode ascii backslashreplace which itself creates a temporary pyunicode representation in addition to the original pyucs2 one there s also some overallocation when resizing the ascii result that isn t taken into account here use an assigned but not printable code point it is in the range of the low surrogates udc00udfff the original testtranslate is overridden here so as to get the correct size estimate str translate uses an intermediate pyucs4 representation tuples have a small fixedsized head and an array of pointers to data since we re testing 64bit addressing we can assume that the pointers are 8 bytes and that thus that the tuples take up 8 bytes per size as a sideeffect of testing long tuples these tests happen to test having more than 231 references to any given object hence the use of different types of objects as contents in different tests test concatenating into a single tuple of more than 2g in length and concatenating a tuple of more than 2g in length separately so the smaller test still gets run even if there isn t memory for the larger test but we still let the tester know the larger test is skipped in verbose mode like testconcat split in two like testconcat split in two the repr of a tuple of falses is exactly 7 times the tuple length like tuples lists have a small fixedsized head and an array of pointers to data so 8 bytes per size also like tuples we make the lists hold references to various objects to test their refcount limits test concatenating into a single list of more than 2g in length and concatenating a list of more than 2g in length separately so the smaller test still gets run even if there isn t memory for the larger test but we still let the tester know the larger test is skipped in verbose mode xxx this tests suffers from overallocation just like testappend this should be fixed in future like testconcat split in two xxx this tests suffers from overallocation just like testappend this should be fixed in future the repr of a list of falses is exactly 7 times the list length list overallocates 18th of the total size on first expansion so the single list append call puts memuse at 9 bytes per size xxx this tests suffers from overallocation just like testappend this should be fixed in future this tests suffers from overallocation just like testappend because of the earlier l remove this append doesn t trigger a resize https github compythoncpythonissues102701 these tests all use one of the bigmemtest decorators to indicate how much memory they use and how much memory they need to be even meaningful the decorators take two arguments a memuse indicator declaring approximate bytes per size unit the test will use at peak usage and a minsize indicator declaring a minimum useful size a test that allocates a bytestring to test various operations near the end will have a minsize of at least 2gb or it wouldn t reach the 32 bit limit so the test wouldn t be very useful and a memuse of 1 one byte per size unit if it allocates only one big string at a time when run with a memory limit set both decorators skip tests that need more memory than available to be meaningful the precisionbigmemtest will always pass minsize as size even if there is much more memory available the bigmemtest decorator will scale size upward to fill available memory bigmem testing houserules try not to allocate too many large objects it s okay to rely on refcounting semantics and don t forget that s create_largestring doesn t release the old s if it exists until well after its new value has been created use del s before the create_largestring call do not compare large objects using assertequal assertin or similar it s a lengthy operation and the errormessage will be utterly useless due to its size to make sure whether a result has the right contents better to use the strip or count methods or compare meaningful slices don t forget to test for large indices offsets and results and such in addition to large sizes anything that probes the 32 bit boundary when repeating an object say a substring or a small list to create a large object make the subobject of a length that is not a power of 2 that way int wrapping problems are more easily detected despite the bigmemtest decorator all tests will actually be called with a much smaller number too in the normal test run 5kb currently this is so the tests themselves get frequent testing consequently always make all large allocations based on the passed in size and don t rely on the size being very large also memuse per size should remain sane less than a few thousand if your test uses more adjust size upward instead beware it seems that one failing test can yield other subsequent tests to fail as well i do not know whether it is due to memory fragmentation issues or other specifics of the platform malloc routine type specific optimization type specific optimization the test takes about size bytes to build a string and then about sqrt size substrings of sqrt size in size and a list to hold sqrt size items it s close but just over 2x size crudely calculate an estimate so that the result of s split won t take up an inordinate amount of memory allocates a string of twice size and briefly two and a list of size because of internal affairs the s split call produces a list of size times the same one character string so we only suffer for the list size otherwise it d cost another 48 times size in bytes nevertheless a list of size takes 8 size bytes crudely calculate an estimate so that the result of s split won t take up an inordinate amount of memory this test is meaningful even with size 2g as long as the doubled string is 2g but it tests more if both are 2g this test is meaningful even with size 2g as long as the repeated string is 2g but it tests more if both are 2g make sure we do some slicing and indexing near the end of the string too not sure if we can do any meaningful tests here even if we start relying on the exact algorithm used the result will be different depending on the size of the c long int even this test is dodgy there s no guarantee that the two things should have a different hash even if they in the current implementation almost always do hack adjust memory use of tests inherited from basestrtest according to character size many codecs convert to the legacy representation first explaining why we add ucs4_char_size to the memuse below acceptable on 32 bit acceptable on 32 bit acceptable on 32 bit str uses a py_ucs4 intermediate representation repr will create a string four times as large as this binary string but we don t want to allocate much more than twice size in total we do extra testing in test_repr_large ascii calls encode ascii backslashreplace which itself creates a temporary py_unicode representation in addition to the original py_ucs2 one there s also some overallocation when resizing the ascii result that isn t taken into account here use an assigned but not printable code point it is in the range of the low surrogates udc00 udfff the original test_translate is overridden here so as to get the correct size estimate str translate uses an intermediate py_ucs4 representation tuples have a small fixed sized head and an array of pointers to data since we re testing 64 bit addressing we can assume that the pointers are 8 bytes and that thus that the tuples take up 8 bytes per size as a side effect of testing long tuples these tests happen to test having more than 2 31 references to any given object hence the use of different types of objects as contents in different tests test concatenating into a single tuple of more than 2g in length and concatenating a tuple of more than 2g in length separately so the smaller test still gets run even if there isn t memory for the larger test but we still let the tester know the larger test is skipped in verbose mode like test_concat split in two acceptable on 32 bit acceptable on 32 bit like test_concat split in two the repr of a tuple of falses is exactly 7 times the tuple length like tuples lists have a small fixed sized head and an array of pointers to data so 8 bytes per size also like tuples we make the lists hold references to various objects to test their refcount limits test concatenating into a single list of more than 2g in length and concatenating a list of more than 2g in length separately so the smaller test still gets run even if there isn t memory for the larger test but we still let the tester know the larger test is skipped in verbose mode xxx this tests suffers from overallocation just like test_append this should be fixed in future like test_concat split in two xxx this tests suffers from overallocation just like test_append this should be fixed in future the repr of a list of falses is exactly 7 times the list length list overallocates 1 8th of the total size on first expansion so the single list append call puts memuse at 9 bytes per size xxx this tests suffers from overallocation just like test_append this should be fixed in future this tests suffers from overallocation just like test_append because of the earlier l remove this append doesn t trigger a resize https github com python cpython issues 102701
from test import support
from test.support import bigmemtest, _1G, _2G, _4G

import unittest
import operator
import sys















































ascii_char_size = 1
ucs2_char_size = 2
ucs4_char_size = 4
pointer_size = 4 if sys.maxsize < 2**32 else 8


class BaseStrTest:

    def _test_capitalize(self, size):
        _ = self.from_latin1
        SUBSTR = self.from_latin1(' abc def ghi')
        s = _('-') * size + SUBSTR
        caps = s.capitalize()
        self.assertEqual(caps[-len(SUBSTR):],
                         SUBSTR.capitalize())
        self.assertEqual(caps.lstrip(_('-')), SUBSTR)

    @bigmemtest(size=_2G + 10, memuse=1)
    def test_center(self, size):
        SUBSTR = self.from_latin1(' abc def ghi')
        s = SUBSTR.center(size)
        self.assertEqual(len(s), size)
        lpadsize = rpadsize = (len(s) - len(SUBSTR)) // 2
        if len(s) % 2:
            lpadsize += 1
        self.assertEqual(s[lpadsize:-rpadsize], SUBSTR)
        self.assertEqual(s.strip(), SUBSTR.strip())

    @bigmemtest(size=_2G, memuse=2)
    def test_count(self, size):
        _ = self.from_latin1
        SUBSTR = _(' abc def ghi')
        s = _('.') * size + SUBSTR
        self.assertEqual(s.count(_('.')), size)
        s += _('.')
        self.assertEqual(s.count(_('.')), size + 1)
        self.assertEqual(s.count(_(' ')), 3)
        self.assertEqual(s.count(_('i')), 1)
        self.assertEqual(s.count(_('j')), 0)

    @bigmemtest(size=_2G, memuse=2)
    def test_endswith(self, size):
        _ = self.from_latin1
        SUBSTR = _(' abc def ghi')
        s = _('-') * size + SUBSTR
        self.assertTrue(s.endswith(SUBSTR))
        self.assertTrue(s.endswith(s))
        s2 = _('...') + s
        self.assertTrue(s2.endswith(s))
        self.assertFalse(s.endswith(_('a') + SUBSTR))
        self.assertFalse(SUBSTR.endswith(s))

    @bigmemtest(size=_2G + 10, memuse=2)
    def test_expandtabs(self, size):
        _ = self.from_latin1
        s = _('-') * size
        tabsize = 8
        self.assertTrue(s.expandtabs() == s)
        del s
        slen, remainder = divmod(size, tabsize)
        s = _('       \t') * slen
        s = s.expandtabs(tabsize)
        self.assertEqual(len(s), size - remainder)
        self.assertEqual(len(s.strip(_(' '))), 0)

    @bigmemtest(size=_2G, memuse=2)
    def test_find(self, size):
        _ = self.from_latin1
        SUBSTR = _(' abc def ghi')
        sublen = len(SUBSTR)
        s = _('').join([SUBSTR, _('-') * size, SUBSTR])
        self.assertEqual(s.find(_(' ')), 0)
        self.assertEqual(s.find(SUBSTR), 0)
        self.assertEqual(s.find(_(' '), sublen), sublen + size)
        self.assertEqual(s.find(SUBSTR, len(SUBSTR)), sublen + size)
        self.assertEqual(s.find(_('i')), SUBSTR.find(_('i')))
        self.assertEqual(s.find(_('i'), sublen),
                         sublen + size + SUBSTR.find(_('i')))
        self.assertEqual(s.find(_('i'), size),
                         sublen + size + SUBSTR.find(_('i')))
        self.assertEqual(s.find(_('j')), -1)

    @bigmemtest(size=_2G, memuse=2)
    def test_index(self, size):
        _ = self.from_latin1
        SUBSTR = _(' abc def ghi')
        sublen = len(SUBSTR)
        s = _('').join([SUBSTR, _('-') * size, SUBSTR])
        self.assertEqual(s.index(_(' ')), 0)
        self.assertEqual(s.index(SUBSTR), 0)
        self.assertEqual(s.index(_(' '), sublen), sublen + size)
        self.assertEqual(s.index(SUBSTR, sublen), sublen + size)
        self.assertEqual(s.index(_('i')), SUBSTR.index(_('i')))
        self.assertEqual(s.index(_('i'), sublen),
                         sublen + size + SUBSTR.index(_('i')))
        self.assertEqual(s.index(_('i'), size),
                         sublen + size + SUBSTR.index(_('i')))
        self.assertRaises(ValueError, s.index, _('j'))

    @bigmemtest(size=_2G, memuse=2)
    def test_isalnum(self, size):
        _ = self.from_latin1
        SUBSTR = _('123456')
        s = _('a') * size + SUBSTR
        self.assertTrue(s.isalnum())
        s += _('.')
        self.assertFalse(s.isalnum())

    @bigmemtest(size=_2G, memuse=2)
    def test_isalpha(self, size):
        _ = self.from_latin1
        SUBSTR = _('zzzzzzz')
        s = _('a') * size + SUBSTR
        self.assertTrue(s.isalpha())
        s += _('.')
        self.assertFalse(s.isalpha())

    @bigmemtest(size=_2G, memuse=2)
    def test_isdigit(self, size):
        _ = self.from_latin1
        SUBSTR = _('123456')
        s = _('9') * size + SUBSTR
        self.assertTrue(s.isdigit())
        s += _('z')
        self.assertFalse(s.isdigit())

    @bigmemtest(size=_2G, memuse=2)
    def test_islower(self, size):
        _ = self.from_latin1
        chars = _(''.join(
            chr(c) for c in range(255) if not chr(c).isupper()))
        repeats = size // len(chars) + 2
        s = chars * repeats
        self.assertTrue(s.islower())
        s += _('A')
        self.assertFalse(s.islower())

    @bigmemtest(size=_2G, memuse=2)
    def test_isspace(self, size):
        _ = self.from_latin1
        whitespace = _(' \f\n\r\t\v')
        repeats = size // len(whitespace) + 2
        s = whitespace * repeats
        self.assertTrue(s.isspace())
        s += _('j')
        self.assertFalse(s.isspace())

    @bigmemtest(size=_2G, memuse=2)
    def test_istitle(self, size):
        _ = self.from_latin1
        SUBSTR = _('123456')
        s = _('').join([_('A'), _('a') * size, SUBSTR])
        self.assertTrue(s.istitle())
        s += _('A')
        self.assertTrue(s.istitle())
        s += _('aA')
        self.assertFalse(s.istitle())

    @bigmemtest(size=_2G, memuse=2)
    def test_isupper(self, size):
        _ = self.from_latin1
        chars = _(''.join(
            chr(c) for c in range(255) if not chr(c).islower()))
        repeats = size // len(chars) + 2
        s = chars * repeats
        self.assertTrue(s.isupper())
        s += _('a')
        self.assertFalse(s.isupper())

    @bigmemtest(size=_2G, memuse=2)
    def test_join(self, size):
        _ = self.from_latin1
        s = _('A') * size
        x = s.join([_('aaaaa'), _('bbbbb')])
        self.assertEqual(x.count(_('a')), 5)
        self.assertEqual(x.count(_('b')), 5)
        self.assertTrue(x.startswith(_('aaaaaA')))
        self.assertTrue(x.endswith(_('Abbbbb')))

    @bigmemtest(size=_2G + 10, memuse=1)
    def test_ljust(self, size):
        _ = self.from_latin1
        SUBSTR = _(' abc def ghi')
        s = SUBSTR.ljust(size)
        self.assertTrue(s.startswith(SUBSTR + _('  ')))
        self.assertEqual(len(s), size)
        self.assertEqual(s.strip(), SUBSTR.strip())

    @bigmemtest(size=_2G + 10, memuse=2)
    def test_lower(self, size):
        _ = self.from_latin1
        s = _('A') * size
        s = s.lower()
        self.assertEqual(len(s), size)
        self.assertEqual(s.count(_('a')), size)

    @bigmemtest(size=_2G + 10, memuse=1)
    def test_lstrip(self, size):
        _ = self.from_latin1
        SUBSTR = _('abc def ghi')
        s = SUBSTR.rjust(size)
        self.assertEqual(len(s), size)
        self.assertEqual(s.lstrip(), SUBSTR.lstrip())
        del s
        s = SUBSTR.ljust(size)
        self.assertEqual(len(s), size)
        
        if isinstance(s, (str, bytes)):
            stripped = s.lstrip()
            self.assertTrue(stripped is s)

    @bigmemtest(size=_2G + 10, memuse=2)
    def test_replace(self, size):
        _ = self.from_latin1
        replacement = _('a')
        s = _(' ') * size
        s = s.replace(_(' '), replacement)
        self.assertEqual(len(s), size)
        self.assertEqual(s.count(replacement), size)
        s = s.replace(replacement, _(' '), size - 4)
        self.assertEqual(len(s), size)
        self.assertEqual(s.count(replacement), 4)
        self.assertEqual(s[-10:], _('      aaaa'))

    @bigmemtest(size=_2G, memuse=2)
    def test_rfind(self, size):
        _ = self.from_latin1
        SUBSTR = _(' abc def ghi')
        sublen = len(SUBSTR)
        s = _('').join([SUBSTR, _('-') * size, SUBSTR])
        self.assertEqual(s.rfind(_(' ')), sublen + size + SUBSTR.rfind(_(' ')))
        self.assertEqual(s.rfind(SUBSTR), sublen + size)
        self.assertEqual(s.rfind(_(' '), 0, size), SUBSTR.rfind(_(' ')))
        self.assertEqual(s.rfind(SUBSTR, 0, sublen + size), 0)
        self.assertEqual(s.rfind(_('i')), sublen + size + SUBSTR.rfind(_('i')))
        self.assertEqual(s.rfind(_('i'), 0, sublen), SUBSTR.rfind(_('i')))
        self.assertEqual(s.rfind(_('i'), 0, sublen + size),
                         SUBSTR.rfind(_('i')))
        self.assertEqual(s.rfind(_('j')), -1)

    @bigmemtest(size=_2G, memuse=2)
    def test_rindex(self, size):
        _ = self.from_latin1
        SUBSTR = _(' abc def ghi')
        sublen = len(SUBSTR)
        s = _('').join([SUBSTR, _('-') * size, SUBSTR])
        self.assertEqual(s.rindex(_(' ')),
                         sublen + size + SUBSTR.rindex(_(' ')))
        self.assertEqual(s.rindex(SUBSTR), sublen + size)
        self.assertEqual(s.rindex(_(' '), 0, sublen + size - 1),
                         SUBSTR.rindex(_(' ')))
        self.assertEqual(s.rindex(SUBSTR, 0, sublen + size), 0)
        self.assertEqual(s.rindex(_('i')),
                         sublen + size + SUBSTR.rindex(_('i')))
        self.assertEqual(s.rindex(_('i'), 0, sublen), SUBSTR.rindex(_('i')))
        self.assertEqual(s.rindex(_('i'), 0, sublen + size),
                         SUBSTR.rindex(_('i')))
        self.assertRaises(ValueError, s.rindex, _('j'))

    @bigmemtest(size=_2G + 10, memuse=1)
    def test_rjust(self, size):
        _ = self.from_latin1
        SUBSTR = _(' abc def ghi')
        s = SUBSTR.ljust(size)
        self.assertTrue(s.startswith(SUBSTR + _('  ')))
        self.assertEqual(len(s), size)
        self.assertEqual(s.strip(), SUBSTR.strip())

    @bigmemtest(size=_2G + 10, memuse=1)
    def test_rstrip(self, size):
        _ = self.from_latin1
        SUBSTR = _(' abc def ghi')
        s = SUBSTR.ljust(size)
        self.assertEqual(len(s), size)
        self.assertEqual(s.rstrip(), SUBSTR.rstrip())
        del s
        s = SUBSTR.rjust(size)
        self.assertEqual(len(s), size)
        
        if isinstance(s, (str, bytes)):
            stripped = s.rstrip()
            self.assertTrue(stripped is s)

    
    
    
    @bigmemtest(size=_2G, memuse=2.1)
    def test_split_small(self, size):
        _ = self.from_latin1
        
        
        chunksize = int(size ** 0.5 + 2)
        SUBSTR = _('a') + _(' ') * chunksize
        s = SUBSTR * chunksize
        l = s.split()
        self.assertEqual(len(l), chunksize)
        expected = _('a')
        for item in l:
            self.assertEqual(item, expected)
        del l
        l = s.split(_('a'))
        self.assertEqual(len(l), chunksize + 1)
        expected = _(' ') * chunksize
        for item in filter(None, l):
            self.assertEqual(item, expected)

    
    
    
    
    
    
    @bigmemtest(size=_2G + 5, memuse=ascii_char_size * 2 + pointer_size)
    def test_split_large(self, size):
        _ = self.from_latin1
        s = _(' a') * size + _(' ')
        l = s.split()
        self.assertEqual(len(l), size)
        self.assertEqual(set(l), set([_('a')]))
        del l
        l = s.split(_('a'))
        self.assertEqual(len(l), size + 1)
        self.assertEqual(set(l), set([_(' ')]))

    @bigmemtest(size=_2G, memuse=2.1)
    def test_splitlines(self, size):
        _ = self.from_latin1
        
        
        chunksize = int(size ** 0.5 + 2) // 2
        SUBSTR = _(' ') * chunksize + _('\n') + _(' ') * chunksize + _('\r\n')
        s = SUBSTR * (chunksize * 2)
        l = s.splitlines()
        self.assertEqual(len(l), chunksize * 4)
        expected = _(' ') * chunksize
        for item in l:
            self.assertEqual(item, expected)

    @bigmemtest(size=_2G, memuse=2)
    def test_startswith(self, size):
        _ = self.from_latin1
        SUBSTR = _(' abc def ghi')
        s = _('-') * size + SUBSTR
        self.assertTrue(s.startswith(s))
        self.assertTrue(s.startswith(_('-') * size))
        self.assertFalse(s.startswith(SUBSTR))

    @bigmemtest(size=_2G, memuse=1)
    def test_strip(self, size):
        _ = self.from_latin1
        SUBSTR = _('   abc def ghi   ')
        s = SUBSTR.rjust(size)
        self.assertEqual(len(s), size)
        self.assertEqual(s.strip(), SUBSTR.strip())
        del s
        s = SUBSTR.ljust(size)
        self.assertEqual(len(s), size)
        self.assertEqual(s.strip(), SUBSTR.strip())

    def _test_swapcase(self, size):
        _ = self.from_latin1
        SUBSTR = _("aBcDeFG12.'\xa9\x00")
        sublen = len(SUBSTR)
        repeats = size // sublen + 2
        s = SUBSTR * repeats
        s = s.swapcase()
        self.assertEqual(len(s), sublen * repeats)
        self.assertEqual(s[:sublen * 3], SUBSTR.swapcase() * 3)
        self.assertEqual(s[-sublen * 3:], SUBSTR.swapcase() * 3)

    def _test_title(self, size):
        _ = self.from_latin1
        SUBSTR = _('SpaaHAaaAaham')
        s = SUBSTR * (size // len(SUBSTR) + 2)
        s = s.title()
        self.assertTrue(s.startswith((SUBSTR * 3).title()))
        self.assertTrue(s.endswith(SUBSTR.lower() * 3))

    @bigmemtest(size=_2G, memuse=2)
    def test_translate(self, size):
        _ = self.from_latin1
        SUBSTR = _('aZz.z.Aaz.')
        trans = bytes.maketrans(b'.aZ', b'-!$')
        sublen = len(SUBSTR)
        repeats = size // sublen + 2
        s = SUBSTR * repeats
        s = s.translate(trans)
        self.assertEqual(len(s), repeats * sublen)
        self.assertEqual(s[:sublen], SUBSTR.translate(trans))
        self.assertEqual(s[-sublen:], SUBSTR.translate(trans))
        self.assertEqual(s.count(_('.')), 0)
        self.assertEqual(s.count(_('!')), repeats * 2)
        self.assertEqual(s.count(_('z')), repeats * 3)

    @bigmemtest(size=_2G + 5, memuse=2)
    def test_upper(self, size):
        _ = self.from_latin1
        s = _('a') * size
        s = s.upper()
        self.assertEqual(len(s), size)
        self.assertEqual(s.count(_('A')), size)

    @bigmemtest(size=_2G + 20, memuse=1)
    def test_zfill(self, size):
        _ = self.from_latin1
        SUBSTR = _('-568324723598234')
        s = SUBSTR.zfill(size)
        self.assertTrue(s.endswith(_('0') + SUBSTR[1:]))
        self.assertTrue(s.startswith(_('-0')))
        self.assertEqual(len(s), size)
        self.assertEqual(s.count(_('0')), size - len(SUBSTR))

    
    
    @bigmemtest(size=_1G + 2, memuse=3)
    def test_concat(self, size):
        _ = self.from_latin1
        s = _('.') * size
        self.assertEqual(len(s), size)
        s = s + s
        self.assertEqual(len(s), size * 2)
        self.assertEqual(s.count(_('.')), size * 2)

    
    
    @bigmemtest(size=_1G + 2, memuse=3)
    def test_repeat(self, size):
        _ = self.from_latin1
        s = _('.') * size
        self.assertEqual(len(s), size)
        s = s * 2
        self.assertEqual(len(s), size * 2)
        self.assertEqual(s.count(_('.')), size * 2)

    @bigmemtest(size=_2G + 20, memuse=2)
    def test_slice_and_getitem(self, size):
        _ = self.from_latin1
        SUBSTR = _('0123456789')
        sublen = len(SUBSTR)
        s = SUBSTR * (size // sublen)
        stepsize = len(s) // 100
        stepsize = stepsize - (stepsize % sublen)
        for i in range(0, len(s) - stepsize, stepsize):
            self.assertEqual(s[i], SUBSTR[0])
            self.assertEqual(s[i:i + sublen], SUBSTR)
            self.assertEqual(s[i:i + sublen:2], SUBSTR[::2])
            if i > 0:
                self.assertEqual(s[i + sublen - 1:i - 1:-3],
                                 SUBSTR[sublen::-3])
        
        
        self.assertEqual(s[len(s) - 1], SUBSTR[-1])
        self.assertEqual(s[-1], SUBSTR[-1])
        self.assertEqual(s[len(s) - 10], SUBSTR[0])
        self.assertEqual(s[-sublen], SUBSTR[0])
        self.assertEqual(s[len(s):], _(''))
        self.assertEqual(s[len(s) - 1:], SUBSTR[-1:])
        self.assertEqual(s[-1:], SUBSTR[-1:])
        self.assertEqual(s[len(s) - sublen:], SUBSTR)
        self.assertEqual(s[-sublen:], SUBSTR)
        self.assertEqual(len(s[:]), len(s))
        self.assertEqual(len(s[:len(s) - 5]), len(s) - 5)
        self.assertEqual(len(s[5:-5]), len(s) - 10)

        self.assertRaises(IndexError, operator.getitem, s, len(s))
        self.assertRaises(IndexError, operator.getitem, s, len(s) + 1)
        self.assertRaises(IndexError, operator.getitem, s, len(s) + 1<<31)

    @bigmemtest(size=_2G, memuse=2)
    def test_contains(self, size):
        _ = self.from_latin1
        SUBSTR = _('0123456789')
        edge = _('-') * (size // 2)
        s = _('').join([edge, SUBSTR, edge])
        del edge
        self.assertTrue(SUBSTR in s)
        self.assertFalse(SUBSTR * 2 in s)
        self.assertTrue(_('-') in s)
        self.assertFalse(_('a') in s)
        s += _('a')
        self.assertTrue(_('a') in s)

    @bigmemtest(size=_2G + 10, memuse=2)
    def test_compare(self, size):
        _ = self.from_latin1
        s1 = _('-') * size
        s2 = _('-') * size
        self.assertTrue(s1 == s2)
        del s2
        s2 = s1 + _('a')
        self.assertFalse(s1 == s2)
        del s2
        s2 = _('.') * size
        self.assertFalse(s1 == s2)

    @bigmemtest(size=_2G + 10, memuse=1)
    def test_hash(self, size):
        
        
        
        
        
        
        _ = self.from_latin1
        s = _('\x00') * size
        h1 = hash(s)
        del s
        s = _('\x00') * (size + 1)
        self.assertNotEqual(h1, hash(s))


class StrTest(unittest.TestCase, BaseStrTest):

    def from_latin1(self, s):
        return s

    def basic_encode_test(self, size, enc, c='.', expectedsize=None):
        if expectedsize is None:
            expectedsize = size
        try:
            s = c * size
            self.assertEqual(len(s.encode(enc)), expectedsize)
        finally:
            s = None

    def setUp(self):
        
        
        self._adjusted = {}
        for name in dir(BaseStrTest):
            if not name.startswith('test_'):
                continue
            meth = getattr(type(self), name)
            try:
                memuse = meth.memuse
            except AttributeError:
                continue
            meth.memuse = ascii_char_size * memuse
            self._adjusted[name] = memuse

    def tearDown(self):
        for name, memuse in self._adjusted.items():
            getattr(type(self), name).memuse = memuse

    @bigmemtest(size=_2G, memuse=ucs4_char_size * 3 + ascii_char_size * 2)
    def test_capitalize(self, size):
        self._test_capitalize(size)

    @bigmemtest(size=_2G, memuse=ucs4_char_size * 3 + ascii_char_size * 2)
    def test_title(self, size):
        self._test_title(size)

    @bigmemtest(size=_2G, memuse=ucs4_char_size * 3 + ascii_char_size * 2)
    def test_swapcase(self, size):
        self._test_swapcase(size)

    
    

    @bigmemtest(size=_2G + 2, memuse=ascii_char_size + 1)
    def test_encode(self, size):
        return self.basic_encode_test(size, 'utf-8')

    @bigmemtest(size=_4G // 6 + 2, memuse=ascii_char_size + ucs4_char_size + 1)
    def test_encode_raw_unicode_escape(self, size):
        try:
            return self.basic_encode_test(size, 'raw_unicode_escape')
        except MemoryError:
            pass 

    @bigmemtest(size=_4G // 5 + 70, memuse=ascii_char_size + 8 + 1)
    def test_encode_utf7(self, size):
        try:
            return self.basic_encode_test(size, 'utf7')
        except MemoryError:
            pass 

    @bigmemtest(size=_4G // 4 + 5, memuse=ascii_char_size + ucs4_char_size + 4)
    def test_encode_utf32(self, size):
        try:
            return self.basic_encode_test(size, 'utf32', expectedsize=4 * size + 4)
        except MemoryError:
            pass 

    @bigmemtest(size=_2G - 1, memuse=ascii_char_size + 1)
    def test_encode_ascii(self, size):
        return self.basic_encode_test(size, 'ascii', c='A')

    

    @bigmemtest(size=_2G + 10, memuse=ascii_char_size * 2 + ucs4_char_size)
    def test_format(self, size):
        s = '-' * size
        sf = '%s' % (s,)
        self.assertTrue(s == sf)
        del sf
        sf = '..%s..' % (s,)
        self.assertEqual(len(sf), len(s) + 4)
        self.assertTrue(sf.startswith('..-'))
        self.assertTrue(sf.endswith('-..'))
        del s, sf

        size //= 2
        edge = '-' * size
        s = ''.join([edge, '%s', edge])
        del edge
        s = s % '...'
        self.assertEqual(len(s), size * 2 + 3)
        self.assertEqual(s.count('.'), 3)
        self.assertEqual(s.count('-'), size * 2)

    @bigmemtest(size=_2G + 10, memuse=ascii_char_size * 2)
    def test_repr_small(self, size):
        s = '-' * size
        s = repr(s)
        self.assertEqual(len(s), size + 2)
        self.assertEqual(s[0], "'")
        self.assertEqual(s[-1], "'")
        self.assertEqual(s.count('-'), size)
        del s
        
        
        
        size = size // 5 * 2
        s = '\x00' * size
        s = repr(s)
        self.assertEqual(len(s), size * 4 + 2)
        self.assertEqual(s[0], "'")
        self.assertEqual(s[-1], "'")
        self.assertEqual(s.count('\\'), size)
        self.assertEqual(s.count('0'), size * 2)

    @bigmemtest(size=_2G + 10, memuse=ascii_char_size * 5)
    def test_repr_large(self, size):
        s = '\x00' * size
        s = repr(s)
        self.assertEqual(len(s), size * 4 + 2)
        self.assertEqual(s[0], "'")
        self.assertEqual(s[-1], "'")
        self.assertEqual(s.count('\\'), size)
        self.assertEqual(s.count('0'), size * 2)

    
    
    
    
    
    @bigmemtest(size=_2G // 5 + 1, memuse=ucs2_char_size +
                                          ucs4_char_size + ascii_char_size * 6)
    def test_unicode_repr(self, size):
        
        
        char = "\uDCBA"
        s = char * size
        try:
            for f in (repr, ascii):
                r = f(s)
                self.assertEqual(len(r), 2 + (len(f(char)) - 2) * size)
                self.assertTrue(r.endswith(r"\udcba'"), r[-10:])
                r = None
        finally:
            r = s = None

    @bigmemtest(size=_2G // 5 + 1, memuse=ucs4_char_size * 2 + ascii_char_size * 10)
    def test_unicode_repr_wide(self, size):
        char = "\U0001DCBA"
        s = char * size
        try:
            for f in (repr, ascii):
                r = f(s)
                self.assertEqual(len(r), 2 + (len(f(char)) - 2) * size)
                self.assertTrue(r.endswith(r"\U0001dcba'"), r[-12:])
                r = None
        finally:
            r = s = None

    
    
    

    @bigmemtest(size=_2G, memuse=ascii_char_size * 2 + ucs4_char_size)
    def test_translate(self, size):
        _ = self.from_latin1
        SUBSTR = _('aZz.z.Aaz.')
        trans = {
            ord(_('.')): _('-'),
            ord(_('a')): _('!'),
            ord(_('Z')): _('$'),
        }
        sublen = len(SUBSTR)
        repeats = size // sublen + 2
        s = SUBSTR * repeats
        s = s.translate(trans)
        self.assertEqual(len(s), repeats * sublen)
        self.assertEqual(s[:sublen], SUBSTR.translate(trans))
        self.assertEqual(s[-sublen:], SUBSTR.translate(trans))
        self.assertEqual(s.count(_('.')), 0)
        self.assertEqual(s.count(_('!')), repeats * 2)
        self.assertEqual(s.count(_('z')), repeats * 3)


class BytesTest(unittest.TestCase, BaseStrTest):

    def from_latin1(self, s):
        return s.encode("latin-1")

    @bigmemtest(size=_2G + 2, memuse=1 + ascii_char_size)
    def test_decode(self, size):
        s = self.from_latin1('.') * size
        self.assertEqual(len(s.decode('utf-8')), size)

    @bigmemtest(size=_2G, memuse=2)
    def test_capitalize(self, size):
        self._test_capitalize(size)

    @bigmemtest(size=_2G, memuse=2)
    def test_title(self, size):
        self._test_title(size)

    @bigmemtest(size=_2G, memuse=2)
    def test_swapcase(self, size):
        self._test_swapcase(size)


class BytearrayTest(unittest.TestCase, BaseStrTest):

    def from_latin1(self, s):
        return bytearray(s.encode("latin-1"))

    @bigmemtest(size=_2G + 2, memuse=1 + ascii_char_size)
    def test_decode(self, size):
        s = self.from_latin1('.') * size
        self.assertEqual(len(s.decode('utf-8')), size)

    @bigmemtest(size=_2G, memuse=2)
    def test_capitalize(self, size):
        self._test_capitalize(size)

    @bigmemtest(size=_2G, memuse=2)
    def test_title(self, size):
        self._test_title(size)

    @bigmemtest(size=_2G, memuse=2)
    def test_swapcase(self, size):
        self._test_swapcase(size)

    test_hash = None
    test_split_large = None

class TupleTest(unittest.TestCase):

    
    
    
    

    
    
    

    @bigmemtest(size=_2G + 2, memuse=pointer_size * 2)
    def test_compare(self, size):
        t1 = ('',) * size
        t2 = ('',) * size
        self.assertTrue(t1 == t2)
        del t2
        t2 = ('',) * (size + 1)
        self.assertFalse(t1 == t2)
        del t2
        t2 = (1,) * size
        self.assertFalse(t1 == t2)

    
    
    
    
    
    def basic_concat_test(self, size):
        t = ((),) * size
        self.assertEqual(len(t), size)
        t = t + t
        self.assertEqual(len(t), size * 2)

    @bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 3)
    def test_concat_small(self, size):
        return self.basic_concat_test(size)

    @bigmemtest(size=_2G + 2, memuse=pointer_size * 3)
    def test_concat_large(self, size):
        return self.basic_concat_test(size)

    @bigmemtest(size=_2G // 5 + 10, memuse=pointer_size * 5)
    def test_contains(self, size):
        t = (1, 2, 3, 4, 5) * size
        self.assertEqual(len(t), size * 5)
        self.assertTrue(5 in t)
        self.assertFalse((1, 2, 3, 4, 5) in t)
        self.assertFalse(0 in t)

    @bigmemtest(size=_2G + 10, memuse=pointer_size)
    def test_hash(self, size):
        t1 = (0,) * size
        h1 = hash(t1)
        del t1
        t2 = (0,) * (size + 1)
        self.assertFalse(h1 == hash(t2))

    @bigmemtest(size=_2G + 10, memuse=pointer_size)
    def test_index_and_slice(self, size):
        t = (None,) * size
        self.assertEqual(len(t), size)
        self.assertEqual(t[-1], None)
        self.assertEqual(t[5], None)
        self.assertEqual(t[size - 1], None)
        self.assertRaises(IndexError, operator.getitem, t, size)
        self.assertEqual(t[:5], (None,) * 5)
        self.assertEqual(t[-5:], (None,) * 5)
        self.assertEqual(t[20:25], (None,) * 5)
        self.assertEqual(t[-25:-20], (None,) * 5)
        self.assertEqual(t[size - 5:], (None,) * 5)
        self.assertEqual(t[size - 5:size], (None,) * 5)
        self.assertEqual(t[size - 6:size - 2], (None,) * 4)
        self.assertEqual(t[size:size], ())
        self.assertEqual(t[size:size+5], ())

    
    def basic_test_repeat(self, size):
        t = ('',) * size
        self.assertEqual(len(t), size)
        t = t * 2
        self.assertEqual(len(t), size * 2)

    @bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 3)
    def test_repeat_small(self, size):
        return self.basic_test_repeat(size)

    @bigmemtest(size=_2G + 2, memuse=pointer_size * 3)
    def test_repeat_large(self, size):
        return self.basic_test_repeat(size)

    @bigmemtest(size=_1G - 1, memuse=12)
    def test_repeat_large_2(self, size):
        return self.basic_test_repeat(size)

    @bigmemtest(size=_1G - 1, memuse=pointer_size * 2)
    def test_from_2G_generator(self, size):
        try:
            t = tuple(iter([42]*size))
        except MemoryError:
            pass 
        else:
            self.assertEqual(len(t), size)
            self.assertEqual(t[:10], (42,) * 10)
            self.assertEqual(t[-10:], (42,) * 10)

    @bigmemtest(size=_1G - 25, memuse=pointer_size * 2)
    def test_from_almost_2G_generator(self, size):
        try:
            t = tuple(iter([42]*size))
        except MemoryError:
            pass 
        else:
            self.assertEqual(len(t), size)
            self.assertEqual(t[:10], (42,) * 10)
            self.assertEqual(t[-10:], (42,) * 10)

    
    def basic_test_repr(self, size):
        t = (False,) * size
        s = repr(t)
        
        self.assertEqual(len(s), size * 7)
        self.assertEqual(s[:10], '(False, Fa')
        self.assertEqual(s[-10:], 'se, False)')

    @bigmemtest(size=_2G // 7 + 2, memuse=pointer_size + ascii_char_size * 7)
    def test_repr_small(self, size):
        return self.basic_test_repr(size)

    @bigmemtest(size=_2G + 2, memuse=pointer_size + ascii_char_size * 7)
    def test_repr_large(self, size):
        return self.basic_test_repr(size)

class ListTest(unittest.TestCase):

    
    
    
    

    @bigmemtest(size=_2G + 2, memuse=pointer_size * 2)
    def test_compare(self, size):
        l1 = [''] * size
        l2 = [''] * size
        self.assertTrue(l1 == l2)
        del l2
        l2 = [''] * (size + 1)
        self.assertFalse(l1 == l2)
        del l2
        l2 = [2] * size
        self.assertFalse(l1 == l2)

    
    
    
    
    
    def basic_test_concat(self, size):
        l = [[]] * size
        self.assertEqual(len(l), size)
        l = l + l
        self.assertEqual(len(l), size * 2)

    @bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 3)
    def test_concat_small(self, size):
        return self.basic_test_concat(size)

    @bigmemtest(size=_2G + 2, memuse=pointer_size * 3)
    def test_concat_large(self, size):
        return self.basic_test_concat(size)

    
    
    def basic_test_inplace_concat(self, size):
        l = [sys.stdout] * size
        l += l
        self.assertEqual(len(l), size * 2)
        self.assertTrue(l[0] is l[-1])
        self.assertTrue(l[size - 1] is l[size + 1])

    @bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 2 * 9/8)
    def test_inplace_concat_small(self, size):
        return self.basic_test_inplace_concat(size)

    @bigmemtest(size=_2G + 2, memuse=pointer_size * 2 * 9/8)
    def test_inplace_concat_large(self, size):
        return self.basic_test_inplace_concat(size)

    @bigmemtest(size=_2G // 5 + 10, memuse=pointer_size * 5)
    def test_contains(self, size):
        l = [1, 2, 3, 4, 5] * size
        self.assertEqual(len(l), size * 5)
        self.assertTrue(5 in l)
        self.assertFalse([1, 2, 3, 4, 5] in l)
        self.assertFalse(0 in l)

    @bigmemtest(size=_2G + 10, memuse=pointer_size)
    def test_hash(self, size):
        l = [0] * size
        self.assertRaises(TypeError, hash, l)

    @bigmemtest(size=_2G + 10, memuse=pointer_size)
    def test_index_and_slice(self, size):
        l = [None] * size
        self.assertEqual(len(l), size)
        self.assertEqual(l[-1], None)
        self.assertEqual(l[5], None)
        self.assertEqual(l[size - 1], None)
        self.assertRaises(IndexError, operator.getitem, l, size)
        self.assertEqual(l[:5], [None] * 5)
        self.assertEqual(l[-5:], [None] * 5)
        self.assertEqual(l[20:25], [None] * 5)
        self.assertEqual(l[-25:-20], [None] * 5)
        self.assertEqual(l[size - 5:], [None] * 5)
        self.assertEqual(l[size - 5:size], [None] * 5)
        self.assertEqual(l[size - 6:size - 2], [None] * 4)
        self.assertEqual(l[size:size], [])
        self.assertEqual(l[size:size+5], [])

        l[size - 2] = 5
        self.assertEqual(len(l), size)
        self.assertEqual(l[-3:], [None, 5, None])
        self.assertEqual(l.count(5), 1)
        self.assertRaises(IndexError, operator.setitem, l, size, 6)
        self.assertEqual(len(l), size)

        l[size - 7:] = [1, 2, 3, 4, 5]
        size -= 2
        self.assertEqual(len(l), size)
        self.assertEqual(l[-7:], [None, None, 1, 2, 3, 4, 5])

        l[:7] = [1, 2, 3, 4, 5]
        size -= 2
        self.assertEqual(len(l), size)
        self.assertEqual(l[:7], [1, 2, 3, 4, 5, None, None])

        del l[size - 1]
        size -= 1
        self.assertEqual(len(l), size)
        self.assertEqual(l[-1], 4)

        del l[-2:]
        size -= 2
        self.assertEqual(len(l), size)
        self.assertEqual(l[-1], 2)

        del l[0]
        size -= 1
        self.assertEqual(len(l), size)
        self.assertEqual(l[0], 2)

        del l[:2]
        size -= 2
        self.assertEqual(len(l), size)
        self.assertEqual(l[0], 4)

    
    def basic_test_repeat(self, size):
        l = [] * size
        self.assertFalse(l)
        l = [''] * size
        self.assertEqual(len(l), size)
        l = l * 2
        self.assertEqual(len(l), size * 2)

    @bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 3)
    def test_repeat_small(self, size):
        return self.basic_test_repeat(size)

    @bigmemtest(size=_2G + 2, memuse=pointer_size * 3)
    def test_repeat_large(self, size):
        return self.basic_test_repeat(size)

    
    
    def basic_test_inplace_repeat(self, size):
        l = ['']
        l *= size
        self.assertEqual(len(l), size)
        self.assertTrue(l[0] is l[-1])
        del l

        l = [''] * size
        l *= 2
        self.assertEqual(len(l), size * 2)
        self.assertTrue(l[size - 1] is l[-1])

    @bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 2 * 9/8)
    def test_inplace_repeat_small(self, size):
        return self.basic_test_inplace_repeat(size)

    @bigmemtest(size=_2G + 2, memuse=pointer_size * 2 * 9/8)
    def test_inplace_repeat_large(self, size):
        return self.basic_test_inplace_repeat(size)

    def basic_test_repr(self, size):
        l = [False] * size
        s = repr(l)
        
        self.assertEqual(len(s), size * 7)
        self.assertEqual(s[:10], '[False, Fa')
        self.assertEqual(s[-10:], 'se, False]')
        self.assertEqual(s.count('F'), size)

    @bigmemtest(size=_2G // 7 + 2, memuse=pointer_size + ascii_char_size * 7)
    def test_repr_small(self, size):
        return self.basic_test_repr(size)

    @bigmemtest(size=_2G + 2, memuse=pointer_size + ascii_char_size * 7)
    def test_repr_large(self, size):
        return self.basic_test_repr(size)

    
    
    @bigmemtest(size=_2G, memuse=pointer_size * 9/8)
    def test_append(self, size):
        l = [object()] * size
        l.append(object())
        self.assertEqual(len(l), size+1)
        self.assertTrue(l[-3] is l[-2])
        self.assertFalse(l[-2] is l[-1])

    @bigmemtest(size=_2G // 5 + 2, memuse=pointer_size * 5)
    def test_count(self, size):
        l = [1, 2, 3, 4, 5] * size
        self.assertEqual(l.count(1), size)
        self.assertEqual(l.count("1"), 0)

    
    
    def basic_test_extend(self, size):
        l = [object] * size
        l.extend(l)
        self.assertEqual(len(l), size * 2)
        self.assertTrue(l[0] is l[-1])
        self.assertTrue(l[size - 1] is l[size + 1])

    @bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 2 * 9/8)
    def test_extend_small(self, size):
        return self.basic_test_extend(size)

    @bigmemtest(size=_2G + 2, memuse=pointer_size * 2 * 9/8)
    def test_extend_large(self, size):
        return self.basic_test_extend(size)

    @bigmemtest(size=_2G // 5 + 2, memuse=pointer_size * 5)
    def test_index(self, size):
        l = [1, 2, 3, 4, 5] * size
        size *= 5
        self.assertEqual(l.index(1), 0)
        self.assertEqual(l.index(5, size - 5), size - 1)
        self.assertEqual(l.index(5, size - 5, size), size - 1)
        self.assertRaises(ValueError, l.index, 1, size - 4, size)
        self.assertRaises(ValueError, l.index, 6)

    
    @bigmemtest(size=_2G + 10, memuse=pointer_size * 9/8)
    def test_insert(self, size):
        l = [1.0] * size
        l.insert(size - 1, "A")
        size += 1
        self.assertEqual(len(l), size)
        self.assertEqual(l[-3:], [1.0, "A", 1.0])

        l.insert(size + 1, "B")
        size += 1
        self.assertEqual(len(l), size)
        self.assertEqual(l[-3:], ["A", 1.0, "B"])

        l.insert(1, "C")
        size += 1
        self.assertEqual(len(l), size)
        self.assertEqual(l[:3], [1.0, "C", 1.0])
        self.assertEqual(l[size - 3:], ["A", 1.0, "B"])

    @bigmemtest(size=_2G // 5 + 4, memuse=pointer_size * 5)
    def test_pop(self, size):
        l = ["a", "b", "c", "d", "e"] * size
        size *= 5
        self.assertEqual(len(l), size)

        item = l.pop()
        size -= 1
        self.assertEqual(len(l), size)
        self.assertEqual(item, "e")
        self.assertEqual(l[-2:], ["c", "d"])

        item = l.pop(0)
        size -= 1
        self.assertEqual(len(l), size)
        self.assertEqual(item, "a")
        self.assertEqual(l[:2], ["b", "c"])

        item = l.pop(size - 2)
        size -= 1
        self.assertEqual(len(l), size)
        self.assertEqual(item, "c")
        self.assertEqual(l[-2:], ["b", "d"])

    @bigmemtest(size=_2G + 10, memuse=pointer_size)
    def test_remove(self, size):
        l = [10] * size
        self.assertEqual(len(l), size)

        l.remove(10)
        size -= 1
        self.assertEqual(len(l), size)

        
        
        l.append(5)
        size += 1
        self.assertEqual(len(l), size)
        self.assertEqual(l[-2:], [10, 5])
        l.remove(5)
        size -= 1
        self.assertEqual(len(l), size)
        self.assertEqual(l[-2:], [10, 10])

    @bigmemtest(size=_2G // 5 + 2, memuse=pointer_size * 5)
    def test_reverse(self, size):
        l = [1, 2, 3, 4, 5] * size
        l.reverse()
        self.assertEqual(len(l), size * 5)
        self.assertEqual(l[-5:], [5, 4, 3, 2, 1])
        self.assertEqual(l[:5], [5, 4, 3, 2, 1])

    @bigmemtest(size=_2G // 5 + 2, memuse=pointer_size * 5 * 1.5)
    def test_sort(self, size):
        l = [1, 2, 3, 4, 5] * size
        l.sort()
        self.assertEqual(len(l), size * 5)
        self.assertEqual(l.count(1), size)
        self.assertEqual(l[:10], [1] * 10)
        self.assertEqual(l[-10:], [5] * 10)


class DictTest(unittest.TestCase):

    @bigmemtest(size=357913941, memuse=160)
    def test_dict(self, size):
        
        d = dict.fromkeys(range(size))
        d[size] = 1


if __name__ == '__main__':
    if len(sys.argv) > 1:
        support.set_memlimit(sys.argv[1])
    unittest.main()