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Copy pathtest_pickle.py
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836 lines (686 loc) · 29.9 KB
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from _compat_pickle import (IMPORT_MAPPING, REVERSE_IMPORT_MAPPING,
NAME_MAPPING, REVERSE_NAME_MAPPING)
import builtins
import collections
import contextlib
import io
import pickle
import struct
import sys
import tempfile
import warnings
import weakref
from textwrap import dedent
import doctest
import unittest
from test import support
from test.support import cpython_only, import_helper, os_helper
from test.support.import_helper import ensure_lazy_imports
from test.pickletester import AbstractHookTests
from test.pickletester import AbstractUnpickleTests
from test.pickletester import AbstractPicklingErrorTests
from test.pickletester import AbstractPickleTests
from test.pickletester import AbstractPickleModuleTests
from test.pickletester import AbstractPersistentPicklerTests
from test.pickletester import AbstractIdentityPersistentPicklerTests
from test.pickletester import AbstractPicklerUnpicklerObjectTests
from test.pickletester import AbstractDispatchTableTests
from test.pickletester import AbstractCustomPicklerClass
from test.pickletester import BigmemPickleTests
try:
import _pickle
has_c_implementation = True
except ImportError:
has_c_implementation = False
class LazyImportTest(unittest.TestCase):
@cpython_only
def test_lazy_import(self):
ensure_lazy_imports("pickle", {"re"})
class PyPickleTests(AbstractPickleModuleTests, unittest.TestCase):
dump = staticmethod(pickle._dump)
dumps = staticmethod(pickle._dumps)
load = staticmethod(pickle._load)
loads = staticmethod(pickle._loads)
Pickler = pickle._Pickler
Unpickler = pickle._Unpickler
class PyUnpicklerTests(AbstractUnpickleTests, unittest.TestCase):
unpickler = pickle._Unpickler
bad_stack_errors = (IndexError,)
truncated_errors = (pickle.UnpicklingError, EOFError,
AttributeError, ValueError,
struct.error, IndexError, ImportError)
def loads(self, buf, **kwds):
f = io.BytesIO(buf)
u = self.unpickler(f, **kwds)
return u.load()
class PyPicklingErrorTests(AbstractPicklingErrorTests, unittest.TestCase):
pickler = pickle._Pickler
def dumps(self, arg, proto=None, **kwargs):
f = io.BytesIO()
p = self.pickler(f, proto, **kwargs)
p.dump(arg)
f.seek(0)
return bytes(f.read())
class PyPicklerTests(AbstractPickleTests, unittest.TestCase):
pickler = pickle._Pickler
unpickler = pickle._Unpickler
def dumps(self, arg, proto=None, **kwargs):
f = io.BytesIO()
p = self.pickler(f, proto, **kwargs)
p.dump(arg)
f.seek(0)
return bytes(f.read())
def loads(self, buf, **kwds):
f = io.BytesIO(buf)
u = self.unpickler(f, **kwds)
return u.load()
@unittest.expectedFailure # TODO: RUSTPYTHON
def test_c_methods(self):
return super().test_c_methods()
class InMemoryPickleTests(AbstractPickleTests, AbstractUnpickleTests,
BigmemPickleTests, unittest.TestCase):
bad_stack_errors = (pickle.UnpicklingError, IndexError)
truncated_errors = (pickle.UnpicklingError, EOFError,
AttributeError, ValueError,
struct.error, IndexError, ImportError)
def dumps(self, arg, protocol=None, **kwargs):
return pickle.dumps(arg, protocol, **kwargs)
def loads(self, buf, **kwds):
return pickle.loads(buf, **kwds)
test_framed_write_sizes_with_delayed_writer = None
test_find_class = None
test_custom_find_class = None
@unittest.expectedFailure # TODO: RUSTPYTHON
def test_c_methods(self):
return super().test_c_methods()
class PersistentPicklerUnpicklerMixin(object):
def dumps(self, arg, proto=None):
class PersPickler(self.pickler):
def persistent_id(subself, obj):
return self.persistent_id(obj)
f = io.BytesIO()
p = PersPickler(f, proto)
p.dump(arg)
return f.getvalue()
def loads(self, buf, **kwds):
class PersUnpickler(self.unpickler):
def persistent_load(subself, obj):
return self.persistent_load(obj)
f = io.BytesIO(buf)
u = PersUnpickler(f, **kwds)
return u.load()
class PyPersPicklerTests(AbstractPersistentPicklerTests,
PersistentPicklerUnpicklerMixin, unittest.TestCase):
pickler = pickle._Pickler
unpickler = pickle._Unpickler
class PyIdPersPicklerTests(AbstractIdentityPersistentPicklerTests,
PersistentPicklerUnpicklerMixin, unittest.TestCase):
pickler = pickle._Pickler
unpickler = pickle._Unpickler
persistent_load_error = pickle.UnpicklingError
@support.cpython_only
def test_pickler_reference_cycle(self):
def check(Pickler):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
f = io.BytesIO()
pickler = Pickler(f, proto)
pickler.dump('abc')
self.assertEqual(self.loads(f.getvalue()), 'abc')
pickler = Pickler(io.BytesIO())
self.assertEqual(pickler.persistent_id('def'), 'def')
r = weakref.ref(pickler)
del pickler
self.assertIsNone(r())
class PersPickler(self.pickler):
def persistent_id(subself, obj):
return obj
check(PersPickler)
class PersPickler(self.pickler):
@classmethod
def persistent_id(cls, obj):
return obj
check(PersPickler)
class PersPickler(self.pickler):
@staticmethod
def persistent_id(obj):
return obj
check(PersPickler)
@support.cpython_only
def test_custom_pickler_dispatch_table_memleak(self):
# See https://github.com/python/cpython/issues/89988
class Pickler(self.pickler):
def __init__(self, *args, **kwargs):
self.dispatch_table = table
super().__init__(*args, **kwargs)
class DispatchTable:
pass
table = DispatchTable()
pickler = Pickler(io.BytesIO())
self.assertIs(pickler.dispatch_table, table)
table_ref = weakref.ref(table)
self.assertIsNotNone(table_ref())
del pickler
del table
support.gc_collect()
self.assertIsNone(table_ref())
@support.cpython_only
def test_unpickler_reference_cycle(self):
def check(Unpickler):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
unpickler = Unpickler(io.BytesIO(self.dumps('abc', proto)))
self.assertEqual(unpickler.load(), 'abc')
unpickler = Unpickler(io.BytesIO())
self.assertEqual(unpickler.persistent_load('def'), 'def')
r = weakref.ref(unpickler)
del unpickler
self.assertIsNone(r())
class PersUnpickler(self.unpickler):
def persistent_load(subself, pid):
return pid
check(PersUnpickler)
class PersUnpickler(self.unpickler):
@classmethod
def persistent_load(cls, pid):
return pid
check(PersUnpickler)
class PersUnpickler(self.unpickler):
@staticmethod
def persistent_load(pid):
return pid
check(PersUnpickler)
def test_pickler_super(self):
class PersPickler(self.pickler):
def persistent_id(subself, obj):
called.append(obj)
self.assertIsNone(super().persistent_id(obj))
return obj
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
f = io.BytesIO()
pickler = PersPickler(f, proto)
called = []
pickler.dump('abc')
self.assertEqual(called, ['abc'])
self.assertEqual(self.loads(f.getvalue()), 'abc')
def test_unpickler_super(self):
class PersUnpickler(self.unpickler):
def persistent_load(subself, pid):
called.append(pid)
with self.assertRaises(self.persistent_load_error):
super().persistent_load(pid)
return pid
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
unpickler = PersUnpickler(io.BytesIO(self.dumps('abc', proto)))
called = []
self.assertEqual(unpickler.load(), 'abc')
self.assertEqual(called, ['abc'])
def test_pickler_instance_attribute(self):
def persistent_id(obj):
called.append(obj)
return obj
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
f = io.BytesIO()
pickler = self.pickler(f, proto)
called = []
old_persistent_id = pickler.persistent_id
pickler.persistent_id = persistent_id
self.assertEqual(pickler.persistent_id, persistent_id)
pickler.dump('abc')
self.assertEqual(called, ['abc'])
self.assertEqual(self.loads(f.getvalue()), 'abc')
del pickler.persistent_id
self.assertEqual(pickler.persistent_id, old_persistent_id)
def test_unpickler_instance_attribute(self):
def persistent_load(pid):
called.append(pid)
return pid
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
unpickler = self.unpickler(io.BytesIO(self.dumps('abc', proto)))
called = []
old_persistent_load = unpickler.persistent_load
unpickler.persistent_load = persistent_load
self.assertEqual(unpickler.persistent_load, persistent_load)
self.assertEqual(unpickler.load(), 'abc')
self.assertEqual(called, ['abc'])
del unpickler.persistent_load
self.assertEqual(unpickler.persistent_load, old_persistent_load)
def test_pickler_super_instance_attribute(self):
class PersPickler(self.pickler):
def persistent_id(subself, obj):
raise AssertionError('should never be called')
def _persistent_id(subself, obj):
called.append(obj)
self.assertIsNone(super().persistent_id(obj))
return obj
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
f = io.BytesIO()
pickler = PersPickler(f, proto)
called = []
old_persistent_id = pickler.persistent_id
pickler.persistent_id = pickler._persistent_id
self.assertEqual(pickler.persistent_id, pickler._persistent_id)
pickler.dump('abc')
self.assertEqual(called, ['abc'])
self.assertEqual(self.loads(f.getvalue()), 'abc')
del pickler.persistent_id
self.assertEqual(pickler.persistent_id, old_persistent_id)
def test_unpickler_super_instance_attribute(self):
class PersUnpickler(self.unpickler):
def persistent_load(subself, pid):
raise AssertionError('should never be called')
def _persistent_load(subself, pid):
called.append(pid)
with self.assertRaises(self.persistent_load_error):
super().persistent_load(pid)
return pid
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
unpickler = PersUnpickler(io.BytesIO(self.dumps('abc', proto)))
called = []
old_persistent_load = unpickler.persistent_load
unpickler.persistent_load = unpickler._persistent_load
self.assertEqual(unpickler.persistent_load, unpickler._persistent_load)
self.assertEqual(unpickler.load(), 'abc')
self.assertEqual(called, ['abc'])
del unpickler.persistent_load
self.assertEqual(unpickler.persistent_load, old_persistent_load)
class PyPicklerUnpicklerObjectTests(AbstractPicklerUnpicklerObjectTests, unittest.TestCase):
pickler_class = pickle._Pickler
unpickler_class = pickle._Unpickler
class PyDispatchTableTests(AbstractDispatchTableTests, unittest.TestCase):
pickler_class = pickle._Pickler
def get_dispatch_table(self):
return pickle.dispatch_table.copy()
class PyChainDispatchTableTests(AbstractDispatchTableTests, unittest.TestCase):
pickler_class = pickle._Pickler
def get_dispatch_table(self):
return collections.ChainMap({}, pickle.dispatch_table)
class PyPicklerHookTests(AbstractHookTests, unittest.TestCase):
class CustomPyPicklerClass(pickle._Pickler,
AbstractCustomPicklerClass):
pass
pickler_class = CustomPyPicklerClass
if has_c_implementation:
class CPickleTests(AbstractPickleModuleTests, unittest.TestCase):
from _pickle import dump, dumps, load, loads, Pickler, Unpickler
class CUnpicklerTests(PyUnpicklerTests):
unpickler = _pickle.Unpickler
bad_stack_errors = (pickle.UnpicklingError,)
truncated_errors = (pickle.UnpicklingError,)
class CPicklingErrorTests(PyPicklingErrorTests):
pickler = _pickle.Pickler
class CPicklerTests(PyPicklerTests):
pickler = _pickle.Pickler
unpickler = _pickle.Unpickler
class CPersPicklerTests(PyPersPicklerTests):
pickler = _pickle.Pickler
unpickler = _pickle.Unpickler
class CIdPersPicklerTests(PyIdPersPicklerTests):
pickler = _pickle.Pickler
unpickler = _pickle.Unpickler
persistent_load_error = _pickle.UnpicklingError
class CDumpPickle_LoadPickle(PyPicklerTests):
pickler = _pickle.Pickler
unpickler = pickle._Unpickler
class DumpPickle_CLoadPickle(PyPicklerTests):
pickler = pickle._Pickler
unpickler = _pickle.Unpickler
class CPicklerUnpicklerObjectTests(AbstractPicklerUnpicklerObjectTests, unittest.TestCase):
pickler_class = _pickle.Pickler
unpickler_class = _pickle.Unpickler
def test_issue18339(self):
unpickler = self.unpickler_class(io.BytesIO())
with self.assertRaises(TypeError):
unpickler.memo = object
# used to cause a segfault
with self.assertRaises(ValueError):
unpickler.memo = {-1: None}
unpickler.memo = {1: None}
def test_concurrent_pickler_dump(self):
f = io.BytesIO()
pickler = self.pickler_class(f)
class X:
def __reduce__(slf):
self.assertRaises(RuntimeError, pickler.dump, 42)
return list, ()
pickler.dump(X()) # should not crash
self.assertEqual(pickle.loads(f.getvalue()), [])
def test_concurrent_pickler_dump_and_init(self):
f = io.BytesIO()
pickler = self.pickler_class(f)
class X:
def __reduce__(slf):
self.assertRaises(RuntimeError, pickler.__init__, f)
return list, ()
pickler.dump([X()]) # should not fail
self.assertEqual(pickle.loads(f.getvalue()), [[]])
def test_concurrent_unpickler_load(self):
global reducer
def reducer():
self.assertRaises(RuntimeError, unpickler.load)
return 42
f = io.BytesIO(b'(c%b\nreducer\n(tRl.' % (__name__.encode(),))
unpickler = self.unpickler_class(f)
unpickled = unpickler.load() # should not fail
self.assertEqual(unpickled, [42])
def test_concurrent_unpickler_load_and_init(self):
global reducer
def reducer():
self.assertRaises(RuntimeError, unpickler.__init__, f)
return 42
f = io.BytesIO(b'(c%b\nreducer\n(tRl.' % (__name__.encode(),))
unpickler = self.unpickler_class(f)
unpickled = unpickler.load() # should not crash
self.assertEqual(unpickled, [42])
class CDispatchTableTests(AbstractDispatchTableTests, unittest.TestCase):
pickler_class = pickle.Pickler
def get_dispatch_table(self):
return pickle.dispatch_table.copy()
class CChainDispatchTableTests(AbstractDispatchTableTests, unittest.TestCase):
pickler_class = pickle.Pickler
def get_dispatch_table(self):
return collections.ChainMap({}, pickle.dispatch_table)
class CPicklerHookTests(AbstractHookTests, unittest.TestCase):
class CustomCPicklerClass(_pickle.Pickler, AbstractCustomPicklerClass):
pass
pickler_class = CustomCPicklerClass
@support.cpython_only
class HeapTypesTests(unittest.TestCase):
def setUp(self):
pickler = _pickle.Pickler(io.BytesIO())
unpickler = _pickle.Unpickler(io.BytesIO())
self._types = (
_pickle.Pickler,
_pickle.Unpickler,
type(pickler.memo),
type(unpickler.memo),
# We cannot test the _pickle.Pdata;
# there's no way to get to it.
)
def test_have_gc(self):
import gc
for tp in self._types:
with self.subTest(tp=tp):
self.assertTrue(gc.is_tracked(tp))
def test_immutable(self):
for tp in self._types:
with self.subTest(tp=tp):
with self.assertRaisesRegex(TypeError, "immutable"):
tp.foo = "bar"
@support.cpython_only
class SizeofTests(unittest.TestCase):
check_sizeof = support.check_sizeof
def test_pickler(self):
basesize = support.calcobjsize('7P2n3i2n4i2P')
p = _pickle.Pickler(io.BytesIO())
self.assertEqual(object.__sizeof__(p), basesize)
MT_size = struct.calcsize('3nP0n')
ME_size = struct.calcsize('Pn0P')
check = self.check_sizeof
check(p, basesize +
MT_size + 8 * ME_size + # Minimal memo table size.
sys.getsizeof(b'x'*4096)) # Minimal write buffer size.
for i in range(6):
p.dump(chr(i))
check(p, basesize +
MT_size + 32 * ME_size + # Size of memo table required to
# save references to 6 objects.
0) # Write buffer is cleared after every dump().
def test_unpickler(self):
basesize = support.calcobjsize('2P2n2P 2P2n2i5P 2P5n8P2n3i')
unpickler = _pickle.Unpickler
P = struct.calcsize('P') # Size of memo table entry.
n = struct.calcsize('n') # Size of mark table entry.
check = self.check_sizeof
for encoding in 'ASCII', 'UTF-16', 'latin-1':
for errors in 'strict', 'replace':
u = unpickler(io.BytesIO(),
encoding=encoding, errors=errors)
self.assertEqual(object.__sizeof__(u), basesize)
check(u, basesize +
32 * P + # Minimal memo table size.
len(encoding) + 1 + len(errors) + 1)
stdsize = basesize + len('ASCII') + 1 + len('strict') + 1
def check_unpickler(data, memo_size, marks_size):
dump = pickle.dumps(data)
u = unpickler(io.BytesIO(dump),
encoding='ASCII', errors='strict')
u.load()
check(u, stdsize + memo_size * P + marks_size * n)
check_unpickler(0, 32, 0)
# 20 is minimal non-empty mark stack size.
check_unpickler([0] * 100, 32, 20)
# 128 is memo table size required to save references to 100 objects.
check_unpickler([chr(i) for i in range(100)], 128, 20)
def recurse(deep):
data = 0
for i in range(deep):
data = [data, data]
return data
check_unpickler(recurse(0), 32, 0)
check_unpickler(recurse(1), 32, 20)
check_unpickler(recurse(20), 32, 20)
check_unpickler(recurse(50), 64, 60)
if not (support.is_wasi and support.Py_DEBUG):
# stack depth too shallow in pydebug WASI.
check_unpickler(recurse(100), 128, 140)
u = unpickler(io.BytesIO(pickle.dumps('a', 0)),
encoding='ASCII', errors='strict')
u.load()
check(u, stdsize + 32 * P + 2 + 1)
ALT_IMPORT_MAPPING = {
('_elementtree', 'xml.etree.ElementTree'),
('cPickle', 'pickle'),
('StringIO', 'io'),
('cStringIO', 'io'),
}
ALT_NAME_MAPPING = {
('__builtin__', 'basestring', 'builtins', 'str'),
('exceptions', 'StandardError', 'builtins', 'Exception'),
('UserDict', 'UserDict', 'collections', 'UserDict'),
('socket', '_socketobject', 'socket', 'SocketType'),
}
def mapping(module, name):
if (module, name) in NAME_MAPPING:
module, name = NAME_MAPPING[(module, name)]
elif module in IMPORT_MAPPING:
module = IMPORT_MAPPING[module]
return module, name
def reverse_mapping(module, name):
if (module, name) in REVERSE_NAME_MAPPING:
module, name = REVERSE_NAME_MAPPING[(module, name)]
elif module in REVERSE_IMPORT_MAPPING:
module = REVERSE_IMPORT_MAPPING[module]
return module, name
def getmodule(module):
try:
return sys.modules[module]
except KeyError:
try:
with warnings.catch_warnings():
action = 'always' if support.verbose else 'ignore'
warnings.simplefilter(action, DeprecationWarning)
__import__(module)
except AttributeError as exc:
if support.verbose:
print("Can't import module %r: %s" % (module, exc))
raise ImportError
except ImportError as exc:
if support.verbose:
print(exc)
raise
return sys.modules[module]
def getattribute(module, name):
obj = getmodule(module)
for n in name.split('.'):
obj = getattr(obj, n)
return obj
def get_exceptions(mod):
for name in dir(mod):
attr = getattr(mod, name)
if isinstance(attr, type) and issubclass(attr, BaseException):
yield name, attr
class CompatPickleTests(unittest.TestCase):
def test_import(self):
modules = set(IMPORT_MAPPING.values())
modules |= set(REVERSE_IMPORT_MAPPING)
modules |= {module for module, name in REVERSE_NAME_MAPPING}
modules |= {module for module, name in NAME_MAPPING.values()}
for module in modules:
try:
getmodule(module)
except ImportError:
pass
def test_import_mapping(self):
for module3, module2 in REVERSE_IMPORT_MAPPING.items():
with self.subTest((module3, module2)):
try:
getmodule(module3)
except ImportError:
pass
if module3[:1] != '_':
self.assertIn(module2, IMPORT_MAPPING)
self.assertEqual(IMPORT_MAPPING[module2], module3)
def test_name_mapping(self):
for (module3, name3), (module2, name2) in REVERSE_NAME_MAPPING.items():
with self.subTest(((module3, name3), (module2, name2))):
if (module2, name2) == ('exceptions', 'OSError'):
attr = getattribute(module3, name3)
self.assertIsSubclass(attr, OSError)
elif (module2, name2) == ('exceptions', 'ImportError'):
attr = getattribute(module3, name3)
self.assertIsSubclass(attr, ImportError)
else:
module, name = mapping(module2, name2)
if module3[:1] != '_':
self.assertEqual((module, name), (module3, name3))
try:
attr = getattribute(module3, name3)
except ImportError:
pass
else:
self.assertEqual(getattribute(module, name), attr)
def test_reverse_import_mapping(self):
for module2, module3 in IMPORT_MAPPING.items():
with self.subTest((module2, module3)):
try:
getmodule(module3)
except ImportError as exc:
if support.verbose:
print(exc)
if ((module2, module3) not in ALT_IMPORT_MAPPING and
REVERSE_IMPORT_MAPPING.get(module3, None) != module2):
for (m3, n3), (m2, n2) in REVERSE_NAME_MAPPING.items():
if (module3, module2) == (m3, m2):
break
else:
self.fail('No reverse mapping from %r to %r' %
(module3, module2))
module = REVERSE_IMPORT_MAPPING.get(module3, module3)
module = IMPORT_MAPPING.get(module, module)
self.assertEqual(module, module3)
def test_reverse_name_mapping(self):
for (module2, name2), (module3, name3) in NAME_MAPPING.items():
with self.subTest(((module2, name2), (module3, name3))):
try:
attr = getattribute(module3, name3)
except ImportError:
pass
module, name = reverse_mapping(module3, name3)
if (module2, name2, module3, name3) not in ALT_NAME_MAPPING:
self.assertEqual((module, name), (module2, name2))
module, name = mapping(module, name)
self.assertEqual((module, name), (module3, name3))
def test_exceptions(self):
self.assertEqual(mapping('exceptions', 'StandardError'),
('builtins', 'Exception'))
self.assertEqual(mapping('exceptions', 'Exception'),
('builtins', 'Exception'))
self.assertEqual(reverse_mapping('builtins', 'Exception'),
('exceptions', 'Exception'))
self.assertEqual(mapping('exceptions', 'OSError'),
('builtins', 'OSError'))
self.assertEqual(reverse_mapping('builtins', 'OSError'),
('exceptions', 'OSError'))
for name, exc in get_exceptions(builtins):
with self.subTest(name):
if exc in (BlockingIOError,
ResourceWarning,
StopAsyncIteration,
PythonFinalizationError,
RecursionError,
EncodingWarning,
BaseExceptionGroup,
ExceptionGroup,
_IncompleteInputError):
continue
if exc is not OSError and issubclass(exc, OSError):
self.assertEqual(reverse_mapping('builtins', name),
('exceptions', 'OSError'))
elif exc is not ImportError and issubclass(exc, ImportError):
self.assertEqual(reverse_mapping('builtins', name),
('exceptions', 'ImportError'))
self.assertEqual(mapping('exceptions', name),
('exceptions', name))
else:
self.assertEqual(reverse_mapping('builtins', name),
('exceptions', name))
self.assertEqual(mapping('exceptions', name),
('builtins', name))
def test_multiprocessing_exceptions(self):
module = import_helper.import_module('multiprocessing.context')
for name, exc in get_exceptions(module):
if issubclass(exc, Warning):
continue
with self.subTest(name):
self.assertEqual(reverse_mapping('multiprocessing.context', name),
('multiprocessing', name))
self.assertEqual(mapping('multiprocessing', name),
('multiprocessing.context', name))
class CommandLineTest(unittest.TestCase):
def setUp(self):
self.filename = tempfile.mktemp()
self.addCleanup(os_helper.unlink, self.filename)
@staticmethod
def text_normalize(string):
"""Dedent *string* and strip it from its surrounding whitespaces.
This method is used by the other utility functions so that any
string to write or to match against can be freely indented.
"""
return dedent(string).strip()
def set_pickle_data(self, data):
with open(self.filename, 'wb') as f:
pickle.dump(data, f)
def invoke_pickle(self, *flags):
output = io.StringIO()
with contextlib.redirect_stdout(output):
pickle._main(args=[*flags, self.filename])
return self.text_normalize(output.getvalue())
def test_invocation(self):
# test 'python -m pickle pickle_file'
data = {
'a': [1, 2.0, 3+4j],
'b': ('character string', b'byte string'),
'c': 'string'
}
expect = '''
{'a': [1, 2.0, (3+4j)],
'b': ('character string', b'byte string'),
'c': 'string'}
'''
self.set_pickle_data(data)
with self.subTest(data=data):
res = self.invoke_pickle()
expect = self.text_normalize(expect)
self.assertListEqual(res.splitlines(), expect.splitlines())
@support.force_not_colorized
def test_unknown_flag(self):
stderr = io.StringIO()
with self.assertRaises(SystemExit):
# check that the parser help is shown
with contextlib.redirect_stderr(stderr):
_ = self.invoke_pickle('--unknown')
self.assertStartsWith(stderr.getvalue(), 'usage: ')
def load_tests(loader, tests, pattern):
tests.addTest(doctest.DocTestSuite(pickle))
return tests
if __name__ == "__main__":
unittest.main()