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Issue #15467: Move helpers for __sizeof__ tests into test_support.

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Patch by Serhiy Storchaka.
This commit is contained in:
Martin v. Löwis 2012-07-29 16:33:05 +02:00
parent 90bc2dbcce
commit 33f799725c
4 changed files with 124 additions and 148 deletions
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39
Lib/test/test_struct.py
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@ -3,7 +3,7 @@ import unittest
import struct
import sys
from test.support import run_unittest, cpython_only
from test import support
ISBIGENDIAN = sys.byteorder == "big"
IS32BIT = sys.maxsize == 0x7fffffff
@ -30,32 +30,6 @@ def bigendian_to_native(value):
return string_reverse(value)
class StructTest(unittest.TestCase):
def setUp(self):
# due to missing size_t information from struct, it is assumed that
# sizeof(Py_ssize_t) = sizeof(void*)
self.header = 'PP'
if hasattr(sys, "gettotalrefcount"):
self.header += '2P'
def check_sizeof(self, format_str, number_of_codes):
def size(fmt):
"""Wrapper around struct.calcsize which enforces the alignment
of the end of a structure to the alignment requirement of pointer.
Note: This wrapper should only be used if a pointer member is
included and no member with a size larger than a pointer exists.
"""
return struct.calcsize(fmt + '0P')
struct_obj = struct.Struct(format_str)
# The size of 'PyStructObject'
totalsize = size(self.header + '5P')
# The size taken up by the 'formatcode' dynamic array
totalsize += size('3P') * (number_of_codes + 1)
result = sys.getsizeof(struct_obj)
msg = 'wrong size for %s: got %d, expected %d' \
% (type(struct_obj), result, totalsize)
self.assertEqual(result, totalsize, msg)
def test_isbigendian(self):
self.assertEqual((struct.pack('=i', 1)[0] == 0), ISBIGENDIAN)
@ -583,7 +557,14 @@ class StructTest(unittest.TestCase):
s = struct.Struct('i')
s.__init__('ii')
@cpython_only
def check_sizeof(self, format_str, number_of_codes):
# The size of 'PyStructObject'
totalsize = support.calcobjsize('5P')
# The size taken up by the 'formatcode' dynamic array
totalsize += struct.calcsize('3P') * (number_of_codes + 1)
support.check_sizeof(self, struct.Struct(format_str), totalsize)
@support.cpython_only
def test__sizeof__(self):
for code in integer_codes:
self.check_sizeof(code, 1)
@ -598,7 +579,7 @@ class StructTest(unittest.TestCase):
self.check_sizeof('0c', 0)
def test_main():
run_unittest(StructTest)
support.run_unittest(StructTest)
if __name__ == '__main__':
test_main()