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Name	Size	Permission	Date
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Rename

"""Unit tests for memory-based file-like objects.
StringIO -- for unicode strings
BytesIO -- for bytes
"""

import unittest
from test import support

import io
import _pyio as pyio
import pickle
import sys

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_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 = b' ' * 1024
        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()