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cpython/Lib/test/test_zlib.py

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import unittest
from test import support
import binascii
import random
import sys
from test.support import bigmemtest, _1G, _4G
zlib = support.import_module('zlib')
class VersionTestCase(unittest.TestCase):
def test_library_version(self):
# Test that the major version of the actual library in use matches the
# major version that we were compiled against. We can't guarantee that
# the minor versions will match (even on the machine on which the module
# was compiled), and the API is stable between minor versions, so
# testing only the major versions avoids spurious failures.
self.assertEqual(zlib.ZLIB_RUNTIME_VERSION[0], zlib.ZLIB_VERSION[0])
class ChecksumTestCase(unittest.TestCase):
# checksum test cases
def test_crc32start(self):
self.assertEqual(zlib.crc32(b""), zlib.crc32(b"", 0))
self.assertTrue(zlib.crc32(b"abc", 0xffffffff))
def test_crc32empty(self):
self.assertEqual(zlib.crc32(b"", 0), 0)
self.assertEqual(zlib.crc32(b"", 1), 1)
self.assertEqual(zlib.crc32(b"", 432), 432)
def test_adler32start(self):
self.assertEqual(zlib.adler32(b""), zlib.adler32(b"", 1))
self.assertTrue(zlib.adler32(b"abc", 0xffffffff))
def test_adler32empty(self):
self.assertEqual(zlib.adler32(b"", 0), 0)
self.assertEqual(zlib.adler32(b"", 1), 1)
self.assertEqual(zlib.adler32(b"", 432), 432)
def assertEqual32(self, seen, expected):
# 32-bit values masked -- checksums on 32- vs 64- bit machines
# This is important if bit 31 (0x08000000L) is set.
self.assertEqual(seen & 0x0FFFFFFFF, expected & 0x0FFFFFFFF)
def test_penguins(self):
self.assertEqual32(zlib.crc32(b"penguin", 0), 0x0e5c1a120)
self.assertEqual32(zlib.crc32(b"penguin", 1), 0x43b6aa94)
self.assertEqual32(zlib.adler32(b"penguin", 0), 0x0bcf02f6)
self.assertEqual32(zlib.adler32(b"penguin", 1), 0x0bd602f7)
self.assertEqual(zlib.crc32(b"penguin"), zlib.crc32(b"penguin", 0))
self.assertEqual(zlib.adler32(b"penguin"),zlib.adler32(b"penguin",1))
def test_crc32_adler32_unsigned(self):
foo = b'abcdefghijklmnop'
# explicitly test signed behavior
self.assertEqual(zlib.crc32(foo), 2486878355)
self.assertEqual(zlib.crc32(b'spam'), 1138425661)
self.assertEqual(zlib.adler32(foo+foo), 3573550353)
self.assertEqual(zlib.adler32(b'spam'), 72286642)
def test_same_as_binascii_crc32(self):
foo = b'abcdefghijklmnop'
crc = 2486878355
self.assertEqual(binascii.crc32(foo), crc)
self.assertEqual(zlib.crc32(foo), crc)
self.assertEqual(binascii.crc32(b'spam'), zlib.crc32(b'spam'))
# Issue #10276 - check that inputs >=4GB are handled correctly.
class ChecksumBigBufferTestCase(unittest.TestCase):
@bigmemtest(size=_4G + 4, memuse=1, dry_run=False)
def test_big_buffer(self, size):
data = b"nyan" * (_1G + 1)
self.assertEqual(zlib.crc32(data), 1044521549)
self.assertEqual(zlib.adler32(data), 2256789997)
class ExceptionTestCase(unittest.TestCase):
# make sure we generate some expected errors
def test_badlevel(self):
# specifying compression level out of range causes an error
# (but -1 is Z_DEFAULT_COMPRESSION and apparently the zlib
# accepts 0 too)
self.assertRaises(zlib.error, zlib.compress, b'ERROR', 10)
def test_badargs(self):
self.assertRaises(TypeError, zlib.adler32)
self.assertRaises(TypeError, zlib.crc32)
self.assertRaises(TypeError, zlib.compress)
self.assertRaises(TypeError, zlib.decompress)
for arg in (42, None, '', 'abc', (), []):
self.assertRaises(TypeError, zlib.adler32, arg)
self.assertRaises(TypeError, zlib.crc32, arg)
self.assertRaises(TypeError, zlib.compress, arg)
self.assertRaises(TypeError, zlib.decompress, arg)
def test_badcompressobj(self):
# verify failure on building compress object with bad params
self.assertRaises(ValueError, zlib.compressobj, 1, zlib.DEFLATED, 0)
# specifying total bits too large causes an error
self.assertRaises(ValueError,
zlib.compressobj, 1, zlib.DEFLATED, zlib.MAX_WBITS + 1)
def test_baddecompressobj(self):
# verify failure on building decompress object with bad params
self.assertRaises(ValueError, zlib.decompressobj, -1)
def test_decompressobj_badflush(self):
# verify failure on calling decompressobj.flush with bad params
self.assertRaises(ValueError, zlib.decompressobj().flush, 0)
self.assertRaises(ValueError, zlib.decompressobj().flush, -1)
class BaseCompressTestCase(object):
def check_big_compress_buffer(self, size, compress_func):
_1M = 1024 * 1024
fmt = "%%0%dx" % (2 * _1M)
# Generate 10MB worth of random, and expand it by repeating it.
# The assumption is that zlib's memory is not big enough to exploit
# such spread out redundancy.
data = b''.join([random.getrandbits(8 * _1M).to_bytes(_1M, 'little')
for i in range(10)])
data = data * (size // len(data) + 1)
try:
compress_func(data)
finally:
# Release memory
data = None
def check_big_decompress_buffer(self, size, decompress_func):
data = b'x' * size
try:
compressed = zlib.compress(data, 1)
finally:
# Release memory
data = None
data = decompress_func(compressed)
# Sanity check
try:
self.assertEqual(len(data), size)
self.assertEqual(len(data.strip(b'x')), 0)
finally:
data = None
class CompressTestCase(BaseCompressTestCase, unittest.TestCase):
# Test compression in one go (whole message compression)
def test_speech(self):
x = zlib.compress(HAMLET_SCENE)
self.assertEqual(zlib.decompress(x), HAMLET_SCENE)
def test_speech128(self):
# compress more data
data = HAMLET_SCENE * 128
x = zlib.compress(data)
self.assertEqual(zlib.compress(bytearray(data)), x)
for ob in x, bytearray(x):
self.assertEqual(zlib.decompress(ob), data)
def test_incomplete_stream(self):
# An useful error message is given
x = zlib.compress(HAMLET_SCENE)
self.assertRaisesRegex(zlib.error,
"Error -5 while decompressing data: incomplete or truncated stream",
zlib.decompress, x[:-1])
# Memory use of the following functions takes into account overallocation
@bigmemtest(size=_1G + 1024 * 1024, memuse=3)
def test_big_compress_buffer(self, size):
compress = lambda s: zlib.compress(s, 1)
self.check_big_compress_buffer(size, compress)
@bigmemtest(size=_1G + 1024 * 1024, memuse=2)
def test_big_decompress_buffer(self, size):
self.check_big_decompress_buffer(size, zlib.decompress)
@bigmemtest(size=_4G + 100, memuse=1, dry_run=False)
def test_length_overflow(self, size):
data = b'x' * size
try:
self.assertRaises(OverflowError, zlib.compress, data, 1)
self.assertRaises(OverflowError, zlib.decompress, data)
finally:
data = None
class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase):
# Test compression object
def test_pair(self):
# straightforward compress/decompress objects
datasrc = HAMLET_SCENE * 128
datazip = zlib.compress(datasrc)
# should compress both bytes and bytearray data
for data in (datasrc, bytearray(datasrc)):
co = zlib.compressobj()
x1 = co.compress(data)
x2 = co.flush()
self.assertRaises(zlib.error, co.flush) # second flush should not work
self.assertEqual(x1 + x2, datazip)
for v1, v2 in ((x1, x2), (bytearray(x1), bytearray(x2))):
dco = zlib.decompressobj()
y1 = dco.decompress(v1 + v2)
y2 = dco.flush()
self.assertEqual(data, y1 + y2)
self.assertIsInstance(dco.unconsumed_tail, bytes)
self.assertIsInstance(dco.unused_data, bytes)
def test_compressoptions(self):
# specify lots of options to compressobj()
level = 2
method = zlib.DEFLATED
wbits = -12
memlevel = 9
strategy = zlib.Z_FILTERED
co = zlib.compressobj(level, method, wbits, memlevel, strategy)
x1 = co.compress(HAMLET_SCENE)
x2 = co.flush()
dco = zlib.decompressobj(wbits)
y1 = dco.decompress(x1 + x2)
y2 = dco.flush()
self.assertEqual(HAMLET_SCENE, y1 + y2)
def test_compressincremental(self):
# compress object in steps, decompress object as one-shot
data = HAMLET_SCENE * 128
co = zlib.compressobj()
bufs = []
for i in range(0, len(data), 256):
bufs.append(co.compress(data[i:i+256]))
bufs.append(co.flush())
combuf = b''.join(bufs)
dco = zlib.decompressobj()
y1 = dco.decompress(b''.join(bufs))
y2 = dco.flush()
self.assertEqual(data, y1 + y2)
def test_decompinc(self, flush=False, source=None, cx=256, dcx=64):
# compress object in steps, decompress object in steps
source = source or HAMLET_SCENE
data = source * 128
co = zlib.compressobj()
bufs = []
for i in range(0, len(data), cx):
bufs.append(co.compress(data[i:i+cx]))
bufs.append(co.flush())
combuf = b''.join(bufs)
decombuf = zlib.decompress(combuf)
# Test type of return value
self.assertIsInstance(decombuf, bytes)
self.assertEqual(data, decombuf)
dco = zlib.decompressobj()
bufs = []
for i in range(0, len(combuf), dcx):
bufs.append(dco.decompress(combuf[i:i+dcx]))
self.assertEqual(b'', dco.unconsumed_tail, ########
"(A) uct should be b'': not %d long" %
len(dco.unconsumed_tail))
self.assertEqual(b'', dco.unused_data)
if flush:
bufs.append(dco.flush())
else:
while True:
chunk = dco.decompress(b'')
if chunk:
bufs.append(chunk)
else:
break
self.assertEqual(b'', dco.unconsumed_tail, ########
"(B) uct should be b'': not %d long" %
len(dco.unconsumed_tail))
self.assertEqual(b'', dco.unused_data)
self.assertEqual(data, b''.join(bufs))
# Failure means: "decompressobj with init options failed"
def test_decompincflush(self):
self.test_decompinc(flush=True)
def test_decompimax(self, source=None, cx=256, dcx=64):
# compress in steps, decompress in length-restricted steps
source = source or HAMLET_SCENE
# Check a decompression object with max_length specified
data = source * 128
co = zlib.compressobj()
bufs = []
for i in range(0, len(data), cx):
bufs.append(co.compress(data[i:i+cx]))
bufs.append(co.flush())
combuf = b''.join(bufs)
self.assertEqual(data, zlib.decompress(combuf),
'compressed data failure')
dco = zlib.decompressobj()
bufs = []
cb = combuf
while cb:
#max_length = 1 + len(cb)//10
chunk = dco.decompress(cb, dcx)
self.assertFalse(len(chunk) > dcx,
'chunk too big (%d>%d)' % (len(chunk), dcx))
bufs.append(chunk)
cb = dco.unconsumed_tail
bufs.append(dco.flush())
self.assertEqual(data, b''.join(bufs), 'Wrong data retrieved')
def test_decompressmaxlen(self, flush=False):
# Check a decompression object with max_length specified
data = HAMLET_SCENE * 128
co = zlib.compressobj()
bufs = []
for i in range(0, len(data), 256):
bufs.append(co.compress(data[i:i+256]))
bufs.append(co.flush())
combuf = b''.join(bufs)
self.assertEqual(data, zlib.decompress(combuf),
'compressed data failure')
dco = zlib.decompressobj()
bufs = []
cb = combuf
while cb:
max_length = 1 + len(cb)//10
chunk = dco.decompress(cb, max_length)
self.assertFalse(len(chunk) > max_length,
'chunk too big (%d>%d)' % (len(chunk),max_length))
bufs.append(chunk)
cb = dco.unconsumed_tail
if flush:
bufs.append(dco.flush())
else:
while chunk:
chunk = dco.decompress(b'', max_length)
self.assertFalse(len(chunk) > max_length,
'chunk too big (%d>%d)' % (len(chunk),max_length))
bufs.append(chunk)
self.assertEqual(data, b''.join(bufs), 'Wrong data retrieved')
def test_decompressmaxlenflush(self):
self.test_decompressmaxlen(flush=True)
def test_maxlenmisc(self):
# Misc tests of max_length
dco = zlib.decompressobj()
self.assertRaises(ValueError, dco.decompress, b"", -1)
self.assertEqual(b'', dco.unconsumed_tail)
def test_clear_unconsumed_tail(self):
# Issue #12050: calling decompress() without providing max_length
# should clear the unconsumed_tail attribute.
cdata = b"x\x9cKLJ\x06\x00\x02M\x01" # "abc"
dco = zlib.decompressobj()
ddata = dco.decompress(cdata, 1)
ddata += dco.decompress(dco.unconsumed_tail)
self.assertEqual(dco.unconsumed_tail, b"")
def test_flushes(self):
# Test flush() with the various options, using all the
# different levels in order to provide more variations.
sync_opt = ['Z_NO_FLUSH', 'Z_SYNC_FLUSH', 'Z_FULL_FLUSH']
sync_opt = [getattr(zlib, opt) for opt in sync_opt
if hasattr(zlib, opt)]
data = HAMLET_SCENE * 8
for sync in sync_opt:
for level in range(10):
obj = zlib.compressobj( level )
a = obj.compress( data[:3000] )
b = obj.flush( sync )
c = obj.compress( data[3000:] )
d = obj.flush()
self.assertEqual(zlib.decompress(b''.join([a,b,c,d])),
data, ("Decompress failed: flush "
"mode=%i, level=%i") % (sync, level))
del obj
def test_odd_flush(self):
# Test for odd flushing bugs noted in 2.0, and hopefully fixed in 2.1
import random
if hasattr(zlib, 'Z_SYNC_FLUSH'):
# Testing on 17K of "random" data
# Create compressor and decompressor objects
co = zlib.compressobj(zlib.Z_BEST_COMPRESSION)
dco = zlib.decompressobj()
# Try 17K of data
# generate random data stream
try:
# In 2.3 and later, WichmannHill is the RNG of the bug report
gen = random.WichmannHill()
except AttributeError:
try:
# 2.2 called it Random
gen = random.Random()
except AttributeError:
# others might simply have a single RNG
gen = random
gen.seed(1)
data = genblock(1, 17 * 1024, generator=gen)
# compress, sync-flush, and decompress
first = co.compress(data)
second = co.flush(zlib.Z_SYNC_FLUSH)
expanded = dco.decompress(first + second)
# if decompressed data is different from the input data, choke.
self.assertEqual(expanded, data, "17K random source doesn't match")
def test_empty_flush(self):
# Test that calling .flush() on unused objects works.
# (Bug #1083110 -- calling .flush() on decompress objects
# caused a core dump.)
co = zlib.compressobj(zlib.Z_BEST_COMPRESSION)
self.assertTrue(co.flush()) # Returns a zlib header
dco = zlib.decompressobj()
self.assertEqual(dco.flush(), b"") # Returns nothing
def test_dictionary(self):
h = HAMLET_SCENE
# Build a simulated dictionary out of the words in HAMLET.
words = h.split()
random.shuffle(words)
zdict = b''.join(words)
# Use it to compress HAMLET.
co = zlib.compressobj(zdict=zdict)
cd = co.compress(h) + co.flush()
# Verify that it will decompress with the dictionary.
dco = zlib.decompressobj(zdict=zdict)
self.assertEqual(dco.decompress(cd) + dco.flush(), h)
# Verify that it fails when not given the dictionary.
dco = zlib.decompressobj()
self.assertRaises(zlib.error, dco.decompress, cd)
def test_dictionary_streaming(self):
# This simulates the reuse of a compressor object for compressing
# several separate data streams.
co = zlib.compressobj(zdict=HAMLET_SCENE)
do = zlib.decompressobj(zdict=HAMLET_SCENE)
piece = HAMLET_SCENE[1000:1500]
d0 = co.compress(piece) + co.flush(zlib.Z_SYNC_FLUSH)
d1 = co.compress(piece[100:]) + co.flush(zlib.Z_SYNC_FLUSH)
d2 = co.compress(piece[:-100]) + co.flush(zlib.Z_SYNC_FLUSH)
self.assertEqual(do.decompress(d0), piece)
self.assertEqual(do.decompress(d1), piece[100:])
self.assertEqual(do.decompress(d2), piece[:-100])
def test_decompress_incomplete_stream(self):
# This is 'foo', deflated
x = b'x\x9cK\xcb\xcf\x07\x00\x02\x82\x01E'
# For the record
self.assertEqual(zlib.decompress(x), b'foo')
self.assertRaises(zlib.error, zlib.decompress, x[:-5])
# Omitting the stream end works with decompressor objects
# (see issue #8672).
dco = zlib.decompressobj()
y = dco.decompress(x[:-5])
y += dco.flush()
self.assertEqual(y, b'foo')
def test_decompress_eof(self):
x = b'x\x9cK\xcb\xcf\x07\x00\x02\x82\x01E' # 'foo'
dco = zlib.decompressobj()
self.assertFalse(dco.eof)
dco.decompress(x[:-5])
self.assertFalse(dco.eof)
dco.decompress(x[-5:])
self.assertTrue(dco.eof)
dco.flush()
self.assertTrue(dco.eof)
def test_decompress_eof_incomplete_stream(self):
x = b'x\x9cK\xcb\xcf\x07\x00\x02\x82\x01E' # 'foo'
dco = zlib.decompressobj()
self.assertFalse(dco.eof)
dco.decompress(x[:-5])
self.assertFalse(dco.eof)
dco.flush()
self.assertFalse(dco.eof)
def test_decompress_unused_data(self):
# Repeated calls to decompress() after EOF should accumulate data in
# dco.unused_data, instead of just storing the arg to the last call.
source = b'abcdefghijklmnopqrstuvwxyz'
remainder = b'0123456789'
y = zlib.compress(source)
x = y + remainder
for maxlen in 0, 1000:
for step in 1, 2, len(y), len(x):
dco = zlib.decompressobj()
data = b''
for i in range(0, len(x), step):
if i < len(y):
self.assertEqual(dco.unused_data, b'')
if maxlen == 0:
data += dco.decompress(x[i : i + step])
self.assertEqual(dco.unconsumed_tail, b'')
else:
data += dco.decompress(
dco.unconsumed_tail + x[i : i + step], maxlen)
data += dco.flush()
self.assertTrue(dco.eof)
self.assertEqual(data, source)
self.assertEqual(dco.unconsumed_tail, b'')
self.assertEqual(dco.unused_data, remainder)
def test_flush_with_freed_input(self):
# Issue #16411: decompressor accesses input to last decompress() call
# in flush(), even if this object has been freed in the meanwhile.
input1 = b'abcdefghijklmnopqrstuvwxyz'
input2 = b'QWERTYUIOPASDFGHJKLZXCVBNM'
data = zlib.compress(input1)
dco = zlib.decompressobj()
dco.decompress(data, 1)
del data
data = zlib.compress(input2)
self.assertEqual(dco.flush(), input1[1:])
if hasattr(zlib.compressobj(), "copy"):
def test_compresscopy(self):
# Test copying a compression object
data0 = HAMLET_SCENE
data1 = bytes(str(HAMLET_SCENE, "ascii").swapcase(), "ascii")
c0 = zlib.compressobj(zlib.Z_BEST_COMPRESSION)
bufs0 = []
bufs0.append(c0.compress(data0))
c1 = c0.copy()
bufs1 = bufs0[:]
bufs0.append(c0.compress(data0))
bufs0.append(c0.flush())
s0 = b''.join(bufs0)
bufs1.append(c1.compress(data1))
bufs1.append(c1.flush())
s1 = b''.join(bufs1)
self.assertEqual(zlib.decompress(s0),data0+data0)
self.assertEqual(zlib.decompress(s1),data0+data1)
def test_badcompresscopy(self):
# Test copying a compression object in an inconsistent state
c = zlib.compressobj()
c.compress(HAMLET_SCENE)
c.flush()
self.assertRaises(ValueError, c.copy)
if hasattr(zlib.decompressobj(), "copy"):
def test_decompresscopy(self):
# Test copying a decompression object
data = HAMLET_SCENE
comp = zlib.compress(data)
# Test type of return value
self.assertIsInstance(comp, bytes)
d0 = zlib.decompressobj()
bufs0 = []
bufs0.append(d0.decompress(comp[:32]))
d1 = d0.copy()
bufs1 = bufs0[:]
bufs0.append(d0.decompress(comp[32:]))
s0 = b''.join(bufs0)
bufs1.append(d1.decompress(comp[32:]))
s1 = b''.join(bufs1)
self.assertEqual(s0,s1)
self.assertEqual(s0,data)
def test_baddecompresscopy(self):
# Test copying a compression object in an inconsistent state
data = zlib.compress(HAMLET_SCENE)
d = zlib.decompressobj()
d.decompress(data)
d.flush()
self.assertRaises(ValueError, d.copy)
# Memory use of the following functions takes into account overallocation
@bigmemtest(size=_1G + 1024 * 1024, memuse=3)
def test_big_compress_buffer(self, size):
c = zlib.compressobj(1)
compress = lambda s: c.compress(s) + c.flush()
self.check_big_compress_buffer(size, compress)
@bigmemtest(size=_1G + 1024 * 1024, memuse=2)
def test_big_decompress_buffer(self, size):
d = zlib.decompressobj()
decompress = lambda s: d.decompress(s) + d.flush()
self.check_big_decompress_buffer(size, decompress)
@bigmemtest(size=_4G + 100, memuse=1, dry_run=False)
def test_length_overflow(self, size):
data = b'x' * size
c = zlib.compressobj(1)
d = zlib.decompressobj()
try:
self.assertRaises(OverflowError, c.compress, data)
self.assertRaises(OverflowError, d.decompress, data)
finally:
data = None
def genblock(seed, length, step=1024, generator=random):
"""length-byte stream of random data from a seed (in step-byte blocks)."""
if seed is not None:
generator.seed(seed)
randint = generator.randint
if length < step or step < 2:
step = length
blocks = bytes()
for i in range(0, length, step):
blocks += bytes(randint(0, 255) for x in range(step))
return blocks
def choose_lines(source, number, seed=None, generator=random):
"""Return a list of number lines randomly chosen from the source"""
if seed is not None:
generator.seed(seed)
sources = source.split('\n')
return [generator.choice(sources) for n in range(number)]
HAMLET_SCENE = b"""
LAERTES
O, fear me not.
I stay too long: but here my father comes.
Enter POLONIUS
A double blessing is a double grace,
Occasion smiles upon a second leave.
LORD POLONIUS
Yet here, Laertes! aboard, aboard, for shame!
The wind sits in the shoulder of your sail,
And you are stay'd for. There; my blessing with thee!
And these few precepts in thy memory
See thou character. Give thy thoughts no tongue,
Nor any unproportioned thought his act.
Be thou familiar, but by no means vulgar.
Those friends thou hast, and their adoption tried,
Grapple them to thy soul with hoops of steel;
But do not dull thy palm with entertainment
Of each new-hatch'd, unfledged comrade. Beware
Of entrance to a quarrel, but being in,
Bear't that the opposed may beware of thee.
Give every man thy ear, but few thy voice;
Take each man's censure, but reserve thy judgment.
Costly thy habit as thy purse can buy,
But not express'd in fancy; rich, not gaudy;
For the apparel oft proclaims the man,
And they in France of the best rank and station
Are of a most select and generous chief in that.
Neither a borrower nor a lender be;
For loan oft loses both itself and friend,
And borrowing dulls the edge of husbandry.
This above all: to thine ownself be true,
And it must follow, as the night the day,
Thou canst not then be false to any man.
Farewell: my blessing season this in thee!
LAERTES
Most humbly do I take my leave, my lord.
LORD POLONIUS
The time invites you; go; your servants tend.
LAERTES
Farewell, Ophelia; and remember well
What I have said to you.
OPHELIA
'Tis in my memory lock'd,
And you yourself shall keep the key of it.
LAERTES
Farewell.
"""
def test_main():
support.run_unittest(
VersionTestCase,
ChecksumTestCase,
ChecksumBigBufferTestCase,
ExceptionTestCase,
CompressTestCase,
CompressObjectTestCase
)
if __name__ == "__main__":
unittest.main() # XXX
###test_main()
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