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from pytest import raises
from _io import StringIO
def test_stringio():
sio = StringIO()
sio.write(u'Hello ')
sio.write(u'world')
assert sio.getvalue() == u'Hello world'
assert StringIO(u"hello").read() == u'hello'
def test_capabilities():
sio = StringIO()
assert sio.readable()
assert sio.writable()
assert sio.seekable()
assert not sio.isatty()
assert not sio.closed
assert not sio.line_buffering
sio.close()
raises(ValueError, sio.readable)
raises(ValueError, sio.writable)
raises(ValueError, sio.seekable)
raises(ValueError, sio.isatty)
assert sio.closed
assert sio.errors is None
def test_closed():
sio = StringIO()
sio.close()
raises(ValueError, sio.read, 1)
raises(ValueError, sio.write, u"text")
def test_read():
buf = u"1234567890"
sio = StringIO(buf)
assert sio.read(0) == ''
assert buf[:1] == sio.read(1)
assert buf[1:5] == sio.read(4)
assert buf[5:] == sio.read(900)
assert u"" == sio.read()
def test_read_binary():
# data is from a test_imghdr test for a GIF file
buf_in = (u'\x47\x49\x46\x38\x39\x61\x10\x00\x10\x00\xf6\x64\x00\xeb'
u'\xbb\x18\xeb\xbe\x21\xf3\xc1\x1a\xfa\xc7\x19\xfd\xcb\x1b'
u'\xff\xcc\x1c\xeb')
assert len(buf_in) == 32
sio = StringIO(buf_in)
buf_out = sio.read(32)
assert buf_in == buf_out
def test_readline():
sio = StringIO(u'123\n456')
assert sio.readline(0) == ''
assert sio.readline(2) == '12'
assert sio.readline(None) == '3\n'
assert sio.readline() == '456'
def test_seek():
s = u"1234567890"
sio = StringIO(s)
sio.read(5)
sio.seek(0)
r = sio.read()
assert r == s
sio.seek(3)
r = sio.read()
assert r == s[3:]
raises(TypeError, sio.seek, 0.0)
exc_info = raises(ValueError, sio.seek, -3)
assert exc_info.value.args[0] == "Negative seek position -3"
raises(ValueError, sio.seek, 3, -1)
raises(ValueError, sio.seek, 3, -3)
sio.close()
raises(ValueError, sio.seek, 0)
def test_overseek():
s = u"1234567890"
sio = StringIO(s)
res = sio.seek(11)
assert res == 11
res = sio.read()
assert res == u""
assert sio.tell() == 11
assert sio.getvalue() == s
sio.write(u"")
assert sio.getvalue() == s
sio.write(s)
assert sio.getvalue() == s + u"\0" + s
def test_tell():
s = u"1234567890"
sio = StringIO(s)
assert sio.tell() == 0
sio.seek(5)
assert sio.tell() == 5
sio.seek(10000)
assert sio.tell() == 10000
sio.close()
raises(ValueError, sio.tell)
def test_truncate():
s = u"1234567890"
sio = StringIO(s)
raises(ValueError, sio.truncate, -1)
sio.seek(6)
res = sio.truncate()
assert res == 6
assert sio.getvalue() == s[:6]
res = sio.truncate(4)
assert res == 4
assert sio.getvalue() == s[:4]
assert sio.tell() == 6
sio.seek(0, 2)
sio.write(s)
assert sio.getvalue() == s[:4] + s
pos = sio.tell()
res = sio.truncate(None)
assert res == pos
assert sio.tell() == pos
raises(TypeError, sio.truncate, '0')
sio.close()
raises(ValueError, sio.truncate, 0)
def test_write_error():
exc_info = raises(TypeError, StringIO, 3)
assert "int" in exc_info.value.args[0]
sio = StringIO(u"")
exc_info = raises(TypeError, sio.write, 3)
assert "int" in exc_info.value.args[0]
def test_newline_none():
sio = StringIO(u"a\nb\r\nc\rd", newline=None)
res = list(sio)
assert res == [u"a\n", u"b\n", u"c\n", u"d"]
sio.seek(0)
res = sio.read(1)
assert res == u"a"
res = sio.read(2)
assert res == u"\nb"
res = sio.read(2)
assert res == u"\nc"
res = sio.read(1)
assert res == u"\n"
sio = StringIO(newline=None)
res = sio.write(u"a\n")
assert res == 2
res = sio.write(u"b\r\n")
assert res == 3
res = sio.write(u"c\rd")
assert res == 3
sio.seek(0)
res = sio.read()
assert res == u"a\nb\nc\nd"
sio = StringIO(u"a\r\nb", newline=None)
res = sio.read(3)
assert res == u"a\nb"
def test_newline_empty():
sio = StringIO(u"a\nb\r\nc\rd", newline="")
res = list(sio)
assert res == [u"a\n", u"b\r\n", u"c\r", u"d"]
sio.seek(0)
res = sio.read(4)
assert res == u"a\nb\r"
res = sio.read(2)
assert res == u"\nc"
res = sio.read(1)
assert res == u"\r"
sio = StringIO(newline="")
res = sio.write(u"a\n")
assert res == 2
res = sio.write(u"b\r")
assert res == 2
res = sio.write(u"\nc")
assert res == 2
res = sio.write(u"\rd")
assert res == 2
sio.seek(0)
res = list(sio)
assert res == [u"a\n", u"b\r\n", u"c\r", u"d"]
def test_newline_lf():
sio = StringIO(u"a\nb\r\nc\rd")
res = list(sio)
assert res == [u"a\n", u"b\r\n", u"c\rd"]
def test_newline_cr():
sio = StringIO(u"a\nb\r\nc\rd", newline="\r")
res = sio.read()
assert res == u"a\rb\r\rc\rd"
sio.seek(0)
res = list(sio)
assert res == [u"a\r", u"b\r", u"\r", u"c\r", u"d"]
def test_newline_crlf():
sio = StringIO(u"a\nb\r\nc\rd", newline="\r\n")
res = sio.read()
assert res == u"a\r\nb\r\r\nc\rd"
sio.seek(0)
res = list(sio)
assert res == [u"a\r\n", u"b\r\r\n", u"c\rd"]
def test_newline_property():
sio = StringIO(newline=None)
assert sio.newlines is None
sio.write(u"a\n")
assert sio.newlines == "\n"
sio.write(u"b\r\n")
assert sio.newlines == ("\n", "\r\n")
sio.write(u"c\rd")
assert sio.newlines == ("\r", "\n", "\r\n")
exc = raises(TypeError, StringIO, newline=b'\n')
assert 'bytes' in str(exc.value)
def test_iterator():
s = u"1234567890\n"
sio = StringIO(s * 10)
assert iter(sio) is sio
assert hasattr(sio, "__iter__")
assert hasattr(sio, "__next__")
i = 0
for line in sio:
assert line == s
i += 1
assert i == 10
sio.seek(0)
i = 0
for line in sio:
assert line == s
i += 1
assert i == 10
sio.seek(len(s) * 10 +1)
assert list(sio) == []
sio = StringIO(s * 2)
sio.close()
raises(ValueError, next, sio)
def test_getstate():
sio = StringIO()
state = sio.__getstate__()
assert len(state) == 4
assert isinstance(state[0], str)
assert isinstance(state[1], str)
assert isinstance(state[2], int)
assert state[3] is None or isinstance(state[3], dict)
sio.close()
raises(ValueError, sio.__getstate__)
def test_setstate():
sio = StringIO()
sio.__setstate__((u"no error", u"\n", 0, None))
sio.__setstate__((u"no error", u"", 0, {"spam": 3}))
raises(ValueError, sio.__setstate__, (u"", u"f", 0, None))
raises(ValueError, sio.__setstate__, (u"", u"", -1, None))
raises(TypeError, sio.__setstate__, (b"", u"", 0, None))
raises(TypeError, sio.__setstate__, (u"", u"", 0.0, None))
raises(TypeError, sio.__setstate__, (u"", u"", 0, 0))
raises(TypeError, sio.__setstate__, (u"len-test", 0))
raises(TypeError, sio.__setstate__)
raises(TypeError, sio.__setstate__, 0)
sio.close()
raises(ValueError, sio.__setstate__, (u"closed", u"", 0, None))
def test_roundtrip_translation():
sio1 = StringIO(u'a\nb', newline='\r\n')
pos = sio1.seek(1)
assert sio1.getvalue() == u'a\r\nb'
state = sio1.__getstate__()
sio2 = StringIO()
sio2.__setstate__(state)
assert sio2.getvalue() == u'a\r\nb'
assert sio2.tell() == pos
def test_roundtrip_state():
s = u'12345678'
sio1 = StringIO(s)
sio1.foo = 42
sio1.seek(2)
assert sio1.getvalue() == s
state = sio1.__getstate__()
sio2 = StringIO()
sio2.__setstate__(state)
assert sio2.getvalue() == s
assert sio2.foo == 42
assert sio2.tell() == 2
def rwbuffer(u, **kwargs):
sio = StringIO(u, **kwargs)
sio.seek(0)
sio.write(u)
sio.seek(0)
return sio
def test_rwbuffer_read():
s = u'12345678'
sio = StringIO(s)
sio.seek(0)
sio.write(u'aaa')
sio.seek(0)
assert sio.read() == u'aaa45678'
def test_rwbuffer_readline():
sio = rwbuffer(u'123\n456')
assert sio.readline(0) == ''
assert sio.readline(2) == '12'
assert sio.readline(None) == '3\n'
assert sio.readline() == '456'
def test_rwbuffer_readline():
sio = rwbuffer(u'123\n456')
assert sio.readline(0) == ''
assert sio.readline(2) == '12'
assert sio.readline(None) == '3\n'
assert sio.readline() == '456'
def test_rwbuffer_newline_none():
sio = rwbuffer(u"a\nb\r\nc\rd", newline=None)
res = list(sio)
assert res == [u"a\n", u"b\n", u"c\n", u"d"]
def test_reinit():
obj = StringIO("\x00")
obj.writelines("\x00")
try:
obj.__init__(1j)
except TypeError as e:
pass
obj.__getstate__()
def test_issue5140():
obj = StringIO("1")
try:
obj.__init__("", ())
except:
pass
assert obj.__next__() == "1"
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