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import _io
def test_init():
raises(TypeError, _io.BytesIO, "12345")
buf = b"1234567890"
b = _io.BytesIO(buf)
assert b.getvalue() == buf
b = _io.BytesIO(None)
assert b.getvalue() == b""
b.__init__(buf * 2)
assert b.getvalue() == buf * 2
b.__init__(buf)
assert b.getvalue() == buf
def test_init_kwargs():
buf = b"1234567890"
b = _io.BytesIO(initial_bytes=buf)
assert b.read() == buf
raises(TypeError, _io.BytesIO, buf, foo=None)
def test_new():
f = _io.BytesIO.__new__(_io.BytesIO)
assert not f.closed
def test_capabilities():
f = _io.BytesIO()
assert f.readable()
assert f.writable()
assert f.seekable()
f.close()
raises(ValueError, f.readable)
raises(ValueError, f.writable)
raises(ValueError, f.seekable)
def test_write():
f = _io.BytesIO()
assert f.write(b"") == 0
assert f.write(b"hello") == 5
exc = raises(TypeError, f.write, u"lo")
assert str(exc.value) == "a bytes-like object is required, not 'str'"
import gc; gc.collect()
assert f.getvalue() == b"hello"
f.close()
def test_read():
f = _io.BytesIO(b"hello")
assert f.read() == b"hello"
import gc; gc.collect()
assert f.read(8192) == b""
f.close()
def test_seek():
f = _io.BytesIO(b"hello")
assert f.tell() == 0
assert f.seek(-1, 2) == 4
assert f.tell() == 4
assert f.seek(0) == 0
def test_truncate():
f = _io.BytesIO()
f.write(b"hello")
assert f.truncate(0) == 0
assert f.tell() == 5
f.seek(0)
f.write(b"hello")
f.seek(3)
assert f.truncate() == 3
assert f.getvalue() == b"hel"
assert f.truncate(2) == 2
assert f.tell() == 3
def test_setstate():
# state is (content, position, __dict__)
f = _io.BytesIO(b"hello")
content, pos, __dict__ = f.__getstate__()
assert (content, pos) == (b"hello", 0)
assert __dict__ is None or __dict__ == {}
f.__setstate__((b"world", 3, {"a": 1}))
assert f.getvalue() == b"world"
assert f.read() == b"ld"
assert f.a == 1
assert f.__getstate__() == (b"world", 5, {"a": 1})
raises(TypeError, f.__setstate__, (b"", 0))
f.close()
raises(ValueError, f.__getstate__)
raises(ValueError, f.__setstate__, ("world", 3, {"a": 1}))
def test_readinto():
for methodname in ["readinto", "readinto1"]:
b = _io.BytesIO(b"hello")
readinto = getattr(b, methodname)
a1 = bytearray(b't')
a2 = bytearray(b'testing')
assert readinto(a1) == 1
assert readinto(a2) == 4
b.seek(0)
m = memoryview(bytearray(b"world"))
assert readinto(m) == 5
#
exc = raises(TypeError, readinto, u"hello")
msg = str(exc.value)
# print(msg)
assert " read-write b" in msg and msg.endswith(", not 'str'")
#
exc = raises(TypeError, readinto, memoryview(b"hello"))
msg = str(exc.value)
# print(msg)
assert " read-write b" in msg and msg.endswith(", not 'memoryview'")
#
b.close()
assert a1 == b"h"
assert a2 == b"elloing"
raises(ValueError, readinto, bytearray(b"hello"))
def test_getbuffer():
memio = _io.BytesIO(b"1234567890")
buf = memio.getbuffer()
assert bytes(buf) == b"1234567890"
memio.seek(5)
buf = memio.getbuffer()
assert bytes(buf) == b"1234567890"
assert buf[5] == ord(b"6")
# Mutating the buffer updates the BytesIO
buf[3:6] = b"abc"
assert bytes(buf) == b"123abc7890"
assert memio.getvalue() == b"123abc7890"
# After the buffer gets released, we can resize the BytesIO again
del buf
memio.truncate()
memio.close()
raises(ValueError, memio.getbuffer)
def test_read1():
memio = _io.BytesIO(b"1234567890")
assert memio.read1() == b"1234567890"
def test_readline():
f = _io.BytesIO(b'abc\ndef\nxyzzy\nfoo\x00bar\nanother line')
assert f.readline() == b'abc\n'
assert f.readline(10) == b'def\n'
assert f.readline(2) == b'xy'
assert f.readline(4) == b'zzy\n'
assert f.readline() == b'foo\x00bar\n'
assert f.readline(None) == b'another line'
raises(TypeError, f.readline, 5.3)
def test_overread():
f = _io.BytesIO(b'abc')
assert f.readline(10) == b'abc'
def test_subclass_bytesio_rawiobase():
class X(_io.BytesIO, _io._RawIOBase):
pass
assert X.mro() == [X, _io.BytesIO, _io._BufferedIOBase, _io._RawIOBase, _io._IOBase, object]
# can instantiate
x = X(b'abc')
# check that _RawIOBase methods work
res = _io._RawIOBase.read(x)
assert res == b'abc'
def test_truncate_on_read_only():
rawio = _io.BytesIO(b"abc")
bufio = _io.BufferedReader(rawio)
assert not bufio.writable()
with raises(_io.UnsupportedOperation):
bufio.truncate()
with raises(_io.UnsupportedOperation):
bufio.truncate(0)
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