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cpython/Lib/test/test_memoryio.py
Sam Gross 723d4d2fe8
gh-118527: Intern code consts in free-threaded build (#118667) 
We already intern and immortalize most string constants. In the
free-threaded build, other constants can be a source of reference count
contention because they are shared by all threads running the same code
objects.
2024-05-06 20:12:39 -04:00

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"""Unit tests for memory-based file-like objects.
StringIO -- for unicode strings
BytesIO -- for bytes
"""
import unittest
from test import support
import gc
import io
import _pyio as pyio
import pickle
import sys
import weakref
class IntLike:
def __init__(self, num):
self._num = num
def __index__(self):
return self._num
__int__ = __index__
class MemorySeekTestMixin:
def testInit(self):
buf = self.buftype("1234567890")
bytesIo = self.ioclass(buf)
def testRead(self):
buf = self.buftype("1234567890")
bytesIo = self.ioclass(buf)
self.assertEqual(buf[:1], bytesIo.read(1))
self.assertEqual(buf[1:5], bytesIo.read(4))
self.assertEqual(buf[5:], bytesIo.read(900))
self.assertEqual(self.EOF, bytesIo.read())
def testReadNoArgs(self):
buf = self.buftype("1234567890")
bytesIo = self.ioclass(buf)
self.assertEqual(buf, bytesIo.read())
self.assertEqual(self.EOF, bytesIo.read())
def testSeek(self):
buf = self.buftype("1234567890")
bytesIo = self.ioclass(buf)
bytesIo.read(5)
bytesIo.seek(0)
self.assertEqual(buf, bytesIo.read())
bytesIo.seek(3)
self.assertEqual(buf[3:], bytesIo.read())
self.assertRaises(TypeError, bytesIo.seek, 0.0)
def testTell(self):
buf = self.buftype("1234567890")
bytesIo = self.ioclass(buf)
self.assertEqual(0, bytesIo.tell())
bytesIo.seek(5)
self.assertEqual(5, bytesIo.tell())
bytesIo.seek(10000)
self.assertEqual(10000, bytesIo.tell())
class MemoryTestMixin:
def test_detach(self):
buf = self.ioclass()
self.assertRaises(self.UnsupportedOperation, buf.detach)
def write_ops(self, f, t):
self.assertEqual(f.write(t("blah.")), 5)
self.assertEqual(f.seek(0), 0)
self.assertEqual(f.write(t("Hello.")), 6)
self.assertEqual(f.tell(), 6)
self.assertEqual(f.seek(5), 5)
self.assertEqual(f.tell(), 5)
self.assertEqual(f.write(t(" world\n\n\n")), 9)
self.assertEqual(f.seek(0), 0)
self.assertEqual(f.write(t("h")), 1)
self.assertEqual(f.truncate(12), 12)
self.assertEqual(f.tell(), 1)
def test_write(self):
buf = self.buftype("hello world\n")
memio = self.ioclass(buf)
self.write_ops(memio, self.buftype)
self.assertEqual(memio.getvalue(), buf)
memio = self.ioclass()
self.write_ops(memio, self.buftype)
self.assertEqual(memio.getvalue(), buf)
self.assertRaises(TypeError, memio.write, None)
memio.close()
self.assertRaises(ValueError, memio.write, self.buftype(""))
def test_writelines(self):
buf = self.buftype("1234567890")
memio = self.ioclass()
self.assertEqual(memio.writelines([buf] * 100), None)
self.assertEqual(memio.getvalue(), buf * 100)
memio.writelines([])
self.assertEqual(memio.getvalue(), buf * 100)
memio = self.ioclass()
self.assertRaises(TypeError, memio.writelines, [buf] + [1])
self.assertEqual(memio.getvalue(), buf)
self.assertRaises(TypeError, memio.writelines, None)
memio.close()
self.assertRaises(ValueError, memio.writelines, [])
def test_writelines_error(self):
memio = self.ioclass()
def error_gen():
yield self.buftype('spam')
raise KeyboardInterrupt
self.assertRaises(KeyboardInterrupt, memio.writelines, error_gen())
def test_truncate(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
self.assertRaises(ValueError, memio.truncate, -1)
self.assertRaises(ValueError, memio.truncate, IntLike(-1))
memio.seek(6)
self.assertEqual(memio.truncate(IntLike(8)), 8)
self.assertEqual(memio.getvalue(), buf[:8])
self.assertEqual(memio.truncate(), 6)
self.assertEqual(memio.getvalue(), buf[:6])
self.assertEqual(memio.truncate(4), 4)
self.assertEqual(memio.getvalue(), buf[:4])
self.assertEqual(memio.tell(), 6)
memio.seek(0, 2)
memio.write(buf)
self.assertEqual(memio.getvalue(), buf[:4] + buf)
pos = memio.tell()
self.assertEqual(memio.truncate(None), pos)
self.assertEqual(memio.tell(), pos)
self.assertRaises(TypeError, memio.truncate, '0')
memio.close()
self.assertRaises(ValueError, memio.truncate, 0)
self.assertRaises(ValueError, memio.truncate, IntLike(0))
def test_init(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
self.assertEqual(memio.getvalue(), buf)
memio = self.ioclass(None)
self.assertEqual(memio.getvalue(), self.EOF)
memio.__init__(buf * 2)
self.assertEqual(memio.getvalue(), buf * 2)
memio.__init__(buf)
self.assertEqual(memio.getvalue(), buf)
self.assertRaises(TypeError, memio.__init__, [])
def test_read(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
self.assertEqual(memio.read(0), self.EOF)
self.assertEqual(memio.read(1), buf[:1])
self.assertEqual(memio.read(4), buf[1:5])
self.assertEqual(memio.read(900), buf[5:])
self.assertEqual(memio.read(), self.EOF)
memio.seek(0)
self.assertEqual(memio.read(IntLike(0)), self.EOF)
self.assertEqual(memio.read(IntLike(1)), buf[:1])
self.assertEqual(memio.read(IntLike(4)), buf[1:5])
self.assertEqual(memio.read(IntLike(900)), buf[5:])
memio.seek(0)
self.assertEqual(memio.read(), buf)
self.assertEqual(memio.read(), self.EOF)
self.assertEqual(memio.tell(), 10)
memio.seek(0)
self.assertEqual(memio.read(-1), buf)
memio.seek(0)
self.assertEqual(memio.read(IntLike(-1)), buf)
memio.seek(0)
self.assertEqual(type(memio.read()), type(buf))
memio.seek(100)
self.assertEqual(type(memio.read()), type(buf))
memio.seek(0)
self.assertEqual(memio.read(None), buf)
self.assertRaises(TypeError, memio.read, '')
memio.seek(len(buf) + 1)
self.assertEqual(memio.read(1), self.EOF)
memio.seek(len(buf) + 1)
self.assertEqual(memio.read(IntLike(1)), self.EOF)
memio.seek(len(buf) + 1)
self.assertEqual(memio.read(), self.EOF)
memio.close()
self.assertRaises(ValueError, memio.read)
def test_readline(self):
buf = self.buftype("1234567890\n")
memio = self.ioclass(buf * 2)
self.assertEqual(memio.readline(0), self.EOF)
self.assertEqual(memio.readline(IntLike(0)), self.EOF)
self.assertEqual(memio.readline(), buf)
self.assertEqual(memio.readline(), buf)
self.assertEqual(memio.readline(), self.EOF)
memio.seek(0)
self.assertEqual(memio.readline(5), buf[:5])
self.assertEqual(memio.readline(5), buf[5:10])
self.assertEqual(memio.readline(5), buf[10:15])
memio.seek(0)
self.assertEqual(memio.readline(IntLike(5)), buf[:5])
self.assertEqual(memio.readline(IntLike(5)), buf[5:10])
self.assertEqual(memio.readline(IntLike(5)), buf[10:15])
memio.seek(0)
self.assertEqual(memio.readline(-1), buf)
memio.seek(0)
self.assertEqual(memio.readline(IntLike(-1)), buf)
memio.seek(0)
self.assertEqual(memio.readline(0), self.EOF)
self.assertEqual(memio.readline(IntLike(0)), self.EOF)
# Issue #24989: Buffer overread
memio.seek(len(buf) * 2 + 1)
self.assertEqual(memio.readline(), self.EOF)
buf = self.buftype("1234567890\n")
memio = self.ioclass((buf * 3)[:-1])
self.assertEqual(memio.readline(), buf)
self.assertEqual(memio.readline(), buf)
self.assertEqual(memio.readline(), buf[:-1])
self.assertEqual(memio.readline(), self.EOF)
memio.seek(0)
self.assertEqual(type(memio.readline()), type(buf))
self.assertEqual(memio.readline(), buf)
self.assertRaises(TypeError, memio.readline, '')
memio.close()
self.assertRaises(ValueError, memio.readline)
def test_readlines(self):
buf = self.buftype("1234567890\n")
memio = self.ioclass(buf * 10)
self.assertEqual(memio.readlines(), [buf] * 10)
memio.seek(5)
self.assertEqual(memio.readlines(), [buf[5:]] + [buf] * 9)
memio.seek(0)
self.assertEqual(memio.readlines(15), [buf] * 2)
memio.seek(0)
self.assertEqual(memio.readlines(-1), [buf] * 10)
memio.seek(0)
self.assertEqual(memio.readlines(0), [buf] * 10)
memio.seek(0)
self.assertEqual(type(memio.readlines()[0]), type(buf))
memio.seek(0)
self.assertEqual(memio.readlines(None), [buf] * 10)
self.assertRaises(TypeError, memio.readlines, '')
# Issue #24989: Buffer overread
memio.seek(len(buf) * 10 + 1)
self.assertEqual(memio.readlines(), [])
memio.close()
self.assertRaises(ValueError, memio.readlines)
def test_iterator(self):
buf = self.buftype("1234567890\n")
memio = self.ioclass(buf * 10)
self.assertEqual(iter(memio), memio)
self.assertTrue(hasattr(memio, '__iter__'))
self.assertTrue(hasattr(memio, '__next__'))
i = 0
for line in memio:
self.assertEqual(line, buf)
i += 1
self.assertEqual(i, 10)
memio.seek(0)
i = 0
for line in memio:
self.assertEqual(line, buf)
i += 1
self.assertEqual(i, 10)
# Issue #24989: Buffer overread
memio.seek(len(buf) * 10 + 1)
self.assertEqual(list(memio), [])
memio = self.ioclass(buf * 2)
memio.close()
self.assertRaises(ValueError, memio.__next__)
def test_getvalue(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
self.assertEqual(memio.getvalue(), buf)
memio.read()
self.assertEqual(memio.getvalue(), buf)
self.assertEqual(type(memio.getvalue()), type(buf))
memio = self.ioclass(buf * 1000)
self.assertEqual(memio.getvalue()[-3:], self.buftype("890"))
memio = self.ioclass(buf)
memio.close()
self.assertRaises(ValueError, memio.getvalue)
def test_seek(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
memio.read(5)
self.assertRaises(ValueError, memio.seek, -1)
self.assertRaises(ValueError, memio.seek, 1, -1)
self.assertRaises(ValueError, memio.seek, 1, 3)
self.assertEqual(memio.seek(0), 0)
self.assertEqual(memio.seek(0, 0), 0)
self.assertEqual(memio.read(), buf)
self.assertEqual(memio.seek(3), 3)
self.assertEqual(memio.seek(0, 1), 3)
self.assertEqual(memio.read(), buf[3:])
self.assertEqual(memio.seek(len(buf)), len(buf))
self.assertEqual(memio.read(), self.EOF)
memio.seek(len(buf) + 1)
self.assertEqual(memio.read(), self.EOF)
self.assertEqual(memio.seek(0, 2), len(buf))
self.assertEqual(memio.read(), self.EOF)
memio.close()
self.assertRaises(ValueError, memio.seek, 0)
def test_overseek(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
self.assertEqual(memio.seek(len(buf) + 1), 11)
self.assertEqual(memio.read(), self.EOF)
self.assertEqual(memio.tell(), 11)
self.assertEqual(memio.getvalue(), buf)
memio.write(self.EOF)
self.assertEqual(memio.getvalue(), buf)
memio.write(buf)
self.assertEqual(memio.getvalue(), buf + self.buftype('\0') + buf)
def test_tell(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
self.assertEqual(memio.tell(), 0)
memio.seek(5)
self.assertEqual(memio.tell(), 5)
memio.seek(10000)
self.assertEqual(memio.tell(), 10000)
memio.close()
self.assertRaises(ValueError, memio.tell)
def test_flush(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
self.assertEqual(memio.flush(), None)
def test_flags(self):
memio = self.ioclass()
self.assertEqual(memio.writable(), True)
self.assertEqual(memio.readable(), True)
self.assertEqual(memio.seekable(), True)
self.assertEqual(memio.isatty(), False)
self.assertEqual(memio.closed, False)
memio.close()
self.assertRaises(ValueError, memio.writable)
self.assertRaises(ValueError, memio.readable)
self.assertRaises(ValueError, memio.seekable)
self.assertRaises(ValueError, memio.isatty)
self.assertEqual(memio.closed, True)
def test_subclassing(self):
buf = self.buftype("1234567890")
def test1():
class MemIO(self.ioclass):
pass
m = MemIO(buf)
return m.getvalue()
def test2():
class MemIO(self.ioclass):
def __init__(me, a, b):
self.ioclass.__init__(me, a)
m = MemIO(buf, None)
return m.getvalue()
self.assertEqual(test1(), buf)
self.assertEqual(test2(), buf)
def test_instance_dict_leak(self):
# Test case for issue #6242.
# This will be caught by regrtest.py -R if this leak.
for _ in range(100):
memio = self.ioclass()
memio.foo = 1
def test_pickling(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
memio.foo = 42
memio.seek(2)
class PickleTestMemIO(self.ioclass):
def __init__(me, initvalue, foo):
self.ioclass.__init__(me, initvalue)
me.foo = foo
# __getnewargs__ is undefined on purpose. This checks that PEP 307
# is used to provide pickling support.
# Pickle expects the class to be on the module level. Here we use a
# little hack to allow the PickleTestMemIO class to derive from
# self.ioclass without having to define all combinations explicitly on
# the module-level.
import __main__
PickleTestMemIO.__module__ = '__main__'
PickleTestMemIO.__qualname__ = PickleTestMemIO.__name__
__main__.PickleTestMemIO = PickleTestMemIO
submemio = PickleTestMemIO(buf, 80)
submemio.seek(2)
# We only support pickle protocol 2 and onward since we use extended
# __reduce__ API of PEP 307 to provide pickling support.
for proto in range(2, pickle.HIGHEST_PROTOCOL + 1):
for obj in (memio, submemio):
obj2 = pickle.loads(pickle.dumps(obj, protocol=proto))
self.assertEqual(obj.getvalue(), obj2.getvalue())
self.assertEqual(obj.__class__, obj2.__class__)
self.assertEqual(obj.foo, obj2.foo)
self.assertEqual(obj.tell(), obj2.tell())
obj2.close()
self.assertRaises(ValueError, pickle.dumps, obj2, proto)
del __main__.PickleTestMemIO
class PyBytesIOTest(MemoryTestMixin, MemorySeekTestMixin, unittest.TestCase):
# Test _pyio.BytesIO; class also inherited for testing C implementation
UnsupportedOperation = pyio.UnsupportedOperation
@staticmethod
def buftype(s):
return s.encode("ascii")
ioclass = pyio.BytesIO
EOF = b""
def test_getbuffer(self):
memio = self.ioclass(b"1234567890")
buf = memio.getbuffer()
self.assertEqual(bytes(buf), b"1234567890")
memio.seek(5)
buf = memio.getbuffer()
self.assertEqual(bytes(buf), b"1234567890")
# Trying to change the size of the BytesIO while a buffer is exported
# raises a BufferError.
self.assertRaises(BufferError, memio.write, b'x' * 100)
self.assertRaises(BufferError, memio.truncate)
self.assertRaises(BufferError, memio.close)
self.assertFalse(memio.closed)
# Mutating the buffer updates the BytesIO
buf[3:6] = b"abc"
self.assertEqual(bytes(buf), b"123abc7890")
self.assertEqual(memio.getvalue(), b"123abc7890")
# After the buffer gets released, we can resize and close the BytesIO
# again
del buf
support.gc_collect()
memio.truncate()
memio.close()
self.assertRaises(ValueError, memio.getbuffer)
def test_getbuffer_empty(self):
memio = self.ioclass()
buf = memio.getbuffer()
self.assertEqual(bytes(buf), b"")
# Trying to change the size of the BytesIO while a buffer is exported
# raises a BufferError.
self.assertRaises(BufferError, memio.write, b'x')
buf2 = memio.getbuffer()
self.assertRaises(BufferError, memio.write, b'x')
buf.release()
self.assertRaises(BufferError, memio.write, b'x')
buf2.release()
memio.write(b'x')
def test_getbuffer_gc_collect(self):
memio = self.ioclass(b"1234567890")
buf = memio.getbuffer()
memiowr = weakref.ref(memio)
bufwr = weakref.ref(buf)
# Create a reference loop.
a = [buf]
a.append(a)
# The Python implementation emits an unraisable exception.
with support.catch_unraisable_exception():
del memio
del buf
del a
# The C implementation emits an unraisable exception.
with support.catch_unraisable_exception():
gc.collect()
self.assertIsNone(memiowr())
self.assertIsNone(bufwr())
def test_read1(self):
buf = self.buftype("1234567890")
self.assertEqual(self.ioclass(buf).read1(), buf)
self.assertEqual(self.ioclass(buf).read1(-1), buf)
def test_readinto(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
b = bytearray(b"hello")
self.assertEqual(memio.readinto(b), 5)
self.assertEqual(b, b"12345")
self.assertEqual(memio.readinto(b), 5)
self.assertEqual(b, b"67890")
self.assertEqual(memio.readinto(b), 0)
self.assertEqual(b, b"67890")
b = bytearray(b"hello world")
memio.seek(0)
self.assertEqual(memio.readinto(b), 10)
self.assertEqual(b, b"1234567890d")
b = bytearray(b"")
memio.seek(0)
self.assertEqual(memio.readinto(b), 0)
self.assertEqual(b, b"")
self.assertRaises(TypeError, memio.readinto, '')
import array
a = array.array('b', b"hello world")
memio = self.ioclass(buf)
memio.readinto(a)
self.assertEqual(a.tobytes(), b"1234567890d")
memio.close()
self.assertRaises(ValueError, memio.readinto, b)
memio = self.ioclass(b"123")
b = bytearray()
memio.seek(42)
memio.readinto(b)
self.assertEqual(b, b"")
def test_relative_seek(self):
buf = self.buftype("1234567890")
memio = self.ioclass(buf)
self.assertEqual(memio.seek(-1, 1), 0)
self.assertEqual(memio.seek(3, 1), 3)
self.assertEqual(memio.seek(-4, 1), 0)
self.assertEqual(memio.seek(-1, 2), 9)
self.assertEqual(memio.seek(1, 1), 10)
self.assertEqual(memio.seek(1, 2), 11)
memio.seek(-3, 2)
self.assertEqual(memio.read(), buf[-3:])
memio.seek(0)
memio.seek(1, 1)
self.assertEqual(memio.read(), buf[1:])
def test_unicode(self):
memio = self.ioclass()
self.assertRaises(TypeError, self.ioclass, "1234567890")
self.assertRaises(TypeError, memio.write, "1234567890")
self.assertRaises(TypeError, memio.writelines, ["1234567890"])
def test_bytes_array(self):
buf = b"1234567890"
import array
a = array.array('b', list(buf))
memio = self.ioclass(a)
self.assertEqual(memio.getvalue(), buf)
self.assertEqual(memio.write(a), 10)
self.assertEqual(memio.getvalue(), buf)
def test_issue5449(self):
buf = self.buftype("1234567890")
self.ioclass(initial_bytes=buf)
self.assertRaises(TypeError, self.ioclass, buf, foo=None)
class TextIOTestMixin:
def test_newlines_property(self):
memio = self.ioclass(newline=None)
# The C StringIO decodes newlines in write() calls, but the Python
# implementation only does when reading. This function forces them to
# be decoded for testing.
def force_decode():
memio.seek(0)
memio.read()
self.assertEqual(memio.newlines, None)
memio.write("a\n")
force_decode()
self.assertEqual(memio.newlines, "\n")
memio.write("b\r\n")
force_decode()
self.assertEqual(memio.newlines, ("\n", "\r\n"))
memio.write("c\rd")
force_decode()
self.assertEqual(memio.newlines, ("\r", "\n", "\r\n"))
def test_relative_seek(self):
memio = self.ioclass()
self.assertRaises(OSError, memio.seek, -1, 1)
self.assertRaises(OSError, memio.seek, 3, 1)
self.assertRaises(OSError, memio.seek, -3, 1)
self.assertRaises(OSError, memio.seek, -1, 2)
self.assertRaises(OSError, memio.seek, 1, 1)
self.assertRaises(OSError, memio.seek, 1, 2)
def test_textio_properties(self):
memio = self.ioclass()
# These are just dummy values but we nevertheless check them for fear
# of unexpected breakage.
self.assertIsNone(memio.encoding)
self.assertIsNone(memio.errors)
self.assertFalse(memio.line_buffering)
def test_newline_default(self):
memio = self.ioclass("a\nb\r\nc\rd")
self.assertEqual(list(memio), ["a\n", "b\r\n", "c\rd"])
self.assertEqual(memio.getvalue(), "a\nb\r\nc\rd")
memio = self.ioclass()
self.assertEqual(memio.write("a\nb\r\nc\rd"), 8)
memio.seek(0)
self.assertEqual(list(memio), ["a\n", "b\r\n", "c\rd"])
self.assertEqual(memio.getvalue(), "a\nb\r\nc\rd")
def test_newline_none(self):
# newline=None
memio = self.ioclass("a\nb\r\nc\rd", newline=None)
self.assertEqual(list(memio), ["a\n", "b\n", "c\n", "d"])
memio.seek(0)
self.assertEqual(memio.read(1), "a")
self.assertEqual(memio.read(2), "\nb")
self.assertEqual(memio.read(2), "\nc")
self.assertEqual(memio.read(1), "\n")
self.assertEqual(memio.getvalue(), "a\nb\nc\nd")
memio = self.ioclass(newline=None)
self.assertEqual(2, memio.write("a\n"))
self.assertEqual(3, memio.write("b\r\n"))
self.assertEqual(3, memio.write("c\rd"))
memio.seek(0)
self.assertEqual(memio.read(), "a\nb\nc\nd")
self.assertEqual(memio.getvalue(), "a\nb\nc\nd")
memio = self.ioclass("a\r\nb", newline=None)
self.assertEqual(memio.read(3), "a\nb")
def test_newline_empty(self):
# newline=""
memio = self.ioclass("a\nb\r\nc\rd", newline="")
self.assertEqual(list(memio), ["a\n", "b\r\n", "c\r", "d"])
memio.seek(0)
self.assertEqual(memio.read(4), "a\nb\r")
self.assertEqual(memio.read(2), "\nc")
self.assertEqual(memio.read(1), "\r")
self.assertEqual(memio.getvalue(), "a\nb\r\nc\rd")
memio = self.ioclass(newline="")
self.assertEqual(2, memio.write("a\n"))
self.assertEqual(2, memio.write("b\r"))
self.assertEqual(2, memio.write("\nc"))
self.assertEqual(2, memio.write("\rd"))
memio.seek(0)
self.assertEqual(list(memio), ["a\n", "b\r\n", "c\r", "d"])
self.assertEqual(memio.getvalue(), "a\nb\r\nc\rd")
def test_newline_lf(self):
# newline="\n"
memio = self.ioclass("a\nb\r\nc\rd", newline="\n")
self.assertEqual(list(memio), ["a\n", "b\r\n", "c\rd"])
self.assertEqual(memio.getvalue(), "a\nb\r\nc\rd")
memio = self.ioclass(newline="\n")
self.assertEqual(memio.write("a\nb\r\nc\rd"), 8)
memio.seek(0)
self.assertEqual(list(memio), ["a\n", "b\r\n", "c\rd"])
self.assertEqual(memio.getvalue(), "a\nb\r\nc\rd")
def test_newline_cr(self):
# newline="\r"
memio = self.ioclass("a\nb\r\nc\rd", newline="\r")
self.assertEqual(memio.read(), "a\rb\r\rc\rd")
memio.seek(0)
self.assertEqual(list(memio), ["a\r", "b\r", "\r", "c\r", "d"])
self.assertEqual(memio.getvalue(), "a\rb\r\rc\rd")
memio = self.ioclass(newline="\r")
self.assertEqual(memio.write("a\nb\r\nc\rd"), 8)
memio.seek(0)
self.assertEqual(list(memio), ["a\r", "b\r", "\r", "c\r", "d"])
memio.seek(0)
self.assertEqual(memio.readlines(), ["a\r", "b\r", "\r", "c\r", "d"])
self.assertEqual(memio.getvalue(), "a\rb\r\rc\rd")
def test_newline_crlf(self):
# newline="\r\n"
memio = self.ioclass("a\nb\r\nc\rd", newline="\r\n")
self.assertEqual(memio.read(), "a\r\nb\r\r\nc\rd")
memio.seek(0)
self.assertEqual(list(memio), ["a\r\n", "b\r\r\n", "c\rd"])
memio.seek(0)
self.assertEqual(memio.readlines(), ["a\r\n", "b\r\r\n", "c\rd"])
self.assertEqual(memio.getvalue(), "a\r\nb\r\r\nc\rd")
memio = self.ioclass(newline="\r\n")
self.assertEqual(memio.write("a\nb\r\nc\rd"), 8)
memio.seek(0)
self.assertEqual(list(memio), ["a\r\n", "b\r\r\n", "c\rd"])
self.assertEqual(memio.getvalue(), "a\r\nb\r\r\nc\rd")
def test_issue5265(self):
# StringIO can duplicate newlines in universal newlines mode
memio = self.ioclass("a\r\nb\r\n", newline=None)
self.assertEqual(memio.read(5), "a\nb\n")
self.assertEqual(memio.getvalue(), "a\nb\n")
def test_newline_argument(self):
self.assertRaises(TypeError, self.ioclass, newline=b"\n")
self.assertRaises(ValueError, self.ioclass, newline="error")
# These should not raise an error
for newline in (None, "", "\n", "\r", "\r\n"):
self.ioclass(newline=newline)
class PyStringIOTest(MemoryTestMixin, MemorySeekTestMixin,
TextIOTestMixin, unittest.TestCase):
buftype = str
ioclass = pyio.StringIO
UnsupportedOperation = pyio.UnsupportedOperation
EOF = ""
def test_lone_surrogates(self):
# Issue #20424
memio = self.ioclass('\ud800')
self.assertEqual(memio.read(), '\ud800')
memio = self.ioclass()
memio.write('\ud800')
self.assertEqual(memio.getvalue(), '\ud800')
class PyStringIOPickleTest(TextIOTestMixin, unittest.TestCase):
"""Test if pickle restores properly the internal state of StringIO.
"""
buftype = str
UnsupportedOperation = pyio.UnsupportedOperation
EOF = ""
class ioclass(pyio.StringIO):
def __new__(cls, *args, **kwargs):
return pickle.loads(pickle.dumps(pyio.StringIO(*args, **kwargs)))
def __init__(self, *args, **kwargs):
pass
class CBytesIOTest(PyBytesIOTest):
ioclass = io.BytesIO
UnsupportedOperation = io.UnsupportedOperation
def test_getstate(self):
memio = self.ioclass()
state = memio.__getstate__()
self.assertEqual(len(state), 3)
bytearray(state[0]) # Check if state[0] supports the buffer interface.
self.assertIsInstance(state[1], int)
if state[2] is not None:
self.assertIsInstance(state[2], dict)
memio.close()
self.assertRaises(ValueError, memio.__getstate__)
def test_setstate(self):
# This checks whether __setstate__ does proper input validation.
memio = self.ioclass()
memio.__setstate__((b"no error", 0, None))
memio.__setstate__((bytearray(b"no error"), 0, None))
memio.__setstate__((b"no error", 0, {'spam': 3}))
self.assertRaises(ValueError, memio.__setstate__, (b"", -1, None))
self.assertRaises(TypeError, memio.__setstate__, ("unicode", 0, None))
self.assertRaises(TypeError, memio.__setstate__, (b"", 0.0, None))
self.assertRaises(TypeError, memio.__setstate__, (b"", 0, 0))
self.assertRaises(TypeError, memio.__setstate__, (b"len-test", 0))
self.assertRaises(TypeError, memio.__setstate__)
self.assertRaises(TypeError, memio.__setstate__, 0)
memio.close()
self.assertRaises(ValueError, memio.__setstate__, (b"closed", 0, None))
check_sizeof = support.check_sizeof
@support.cpython_only
def test_sizeof(self):
basesize = support.calcobjsize('P2n2Pn')
check = self.check_sizeof
self.assertEqual(object.__sizeof__(io.BytesIO()), basesize)
check(io.BytesIO(), basesize )
n = 1000 # use a variable to prevent constant folding
check(io.BytesIO(b'a' * n), basesize + sys.getsizeof(b'a' * n))
# Various tests of copy-on-write behaviour for BytesIO.
def _test_cow_mutation(self, mutation):
# Common code for all BytesIO copy-on-write mutation tests.
imm = (' ' * 1024).encode("ascii")
old_rc = sys.getrefcount(imm)
memio = self.ioclass(imm)
self.assertEqual(sys.getrefcount(imm), old_rc + 1)
mutation(memio)
self.assertEqual(sys.getrefcount(imm), old_rc)
@support.cpython_only
def test_cow_truncate(self):
# Ensure truncate causes a copy.
def mutation(memio):
memio.truncate(1)
self._test_cow_mutation(mutation)
@support.cpython_only
def test_cow_write(self):
# Ensure write that would not cause a resize still results in a copy.
def mutation(memio):
memio.seek(0)
memio.write(b'foo')
self._test_cow_mutation(mutation)
@support.cpython_only
def test_cow_setstate(self):
# __setstate__ should cause buffer to be released.
memio = self.ioclass(b'foooooo')
state = memio.__getstate__()
def mutation(memio):
memio.__setstate__(state)
self._test_cow_mutation(mutation)
@support.cpython_only
def test_cow_mutable(self):
# BytesIO should accept only Bytes for copy-on-write sharing, since
# arbitrary buffer-exporting objects like bytearray() aren't guaranteed
# to be immutable.
ba = bytearray(1024)
old_rc = sys.getrefcount(ba)
memio = self.ioclass(ba)
self.assertEqual(sys.getrefcount(ba), old_rc)
class CStringIOTest(PyStringIOTest):
ioclass = io.StringIO
UnsupportedOperation = io.UnsupportedOperation
# XXX: For the Python version of io.StringIO, this is highly
# dependent on the encoding used for the underlying buffer.
def test_widechar(self):
buf = self.buftype("\U0002030a\U00020347")
memio = self.ioclass(buf)
self.assertEqual(memio.getvalue(), buf)
self.assertEqual(memio.write(buf), len(buf))
self.assertEqual(memio.tell(), len(buf))
self.assertEqual(memio.getvalue(), buf)
self.assertEqual(memio.write(buf), len(buf))
self.assertEqual(memio.tell(), len(buf) * 2)
self.assertEqual(memio.getvalue(), buf + buf)
def test_getstate(self):
memio = self.ioclass()
state = memio.__getstate__()
self.assertEqual(len(state), 4)
self.assertIsInstance(state[0], str)
self.assertIsInstance(state[1], str)
self.assertIsInstance(state[2], int)
if state[3] is not None:
self.assertIsInstance(state[3], dict)
memio.close()
self.assertRaises(ValueError, memio.__getstate__)
def test_setstate(self):
# This checks whether __setstate__ does proper input validation.
memio = self.ioclass()
memio.__setstate__(("no error", "\n", 0, None))
memio.__setstate__(("no error", "", 0, {'spam': 3}))
self.assertRaises(ValueError, memio.__setstate__, ("", "f", 0, None))
self.assertRaises(ValueError, memio.__setstate__, ("", "", -1, None))
self.assertRaises(TypeError, memio.__setstate__, (b"", "", 0, None))
self.assertRaises(TypeError, memio.__setstate__, ("", b"", 0, None))
self.assertRaises(TypeError, memio.__setstate__, ("", "", 0.0, None))
self.assertRaises(TypeError, memio.__setstate__, ("", "", 0, 0))
self.assertRaises(TypeError, memio.__setstate__, ("len-test", 0))
self.assertRaises(TypeError, memio.__setstate__)
self.assertRaises(TypeError, memio.__setstate__, 0)
memio.close()
self.assertRaises(ValueError, memio.__setstate__, ("closed", "", 0, None))
class CStringIOPickleTest(PyStringIOPickleTest):
UnsupportedOperation = io.UnsupportedOperation
class ioclass(io.StringIO):
def __new__(cls, *args, **kwargs):
return pickle.loads(pickle.dumps(io.StringIO(*args, **kwargs)))
def __init__(self, *args, **kwargs):
pass
if __name__ == '__main__':
unittest.main()
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