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class AppTestStringIO:
def test_stringio(self):
import io
sio = io.StringIO()
sio.write('Hello ')
sio.write('world')
assert sio.getvalue() == 'Hello world'
assert io.StringIO("hello").read() == 'hello'
def test_capabilities(self):
import io
sio = io.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(self):
import io
sio = io.StringIO()
sio.close()
raises(ValueError, sio.read, 1)
raises(ValueError, sio.write, "text")
def test_read(self):
import io
buf = "1234567890"
sio = io.StringIO(buf)
assert buf[:1] == sio.read(1)
assert buf[1:5] == sio.read(4)
assert buf[5:] == sio.read(900)
assert "" == sio.read()
def test_readline(self):
import io
sio = io.StringIO('123\n456')
assert sio.readline(2) == '12'
assert sio.readline(None) == '3\n'
assert sio.readline() == '456'
def test_seek(self):
import io
s = "1234567890"
sio = io.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(self):
import io
s = "1234567890"
sio = io.StringIO(s)
res = sio.seek(11)
assert res == 11
res = sio.read()
assert res == ""
assert sio.tell() == 11
assert sio.getvalue() == s
sio.write("")
assert sio.getvalue() == s
sio.write(s)
assert sio.getvalue() == s + "\0" + s
def test_tell(self):
import io
s = "1234567890"
sio = io.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(self):
import io
s = "1234567890"
sio = io.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(self):
import io
exc_info = raises(TypeError, io.StringIO, 3)
assert "int" in exc_info.value.args[0]
sio = io.StringIO("")
exc_info = raises(TypeError, sio.write, 3)
assert "int" in exc_info.value.args[0]
def test_newline_none(self):
import io
sio = io.StringIO("a\nb\r\nc\rd", newline=None)
res = list(sio)
assert res == ["a\n", "b\n", "c\n", "d"]
sio.seek(0)
res = sio.read(1)
assert res == "a"
res = sio.read(2)
assert res == "\nb"
res = sio.read(2)
assert res == "\nc"
res = sio.read(1)
assert res == "\n"
sio = io.StringIO(newline=None)
res = sio.write("a\n")
assert res == 2
res = sio.write("b\r\n")
assert res == 3
res = sio.write("c\rd")
assert res == 3
sio.seek(0)
res = sio.read()
assert res == "a\nb\nc\nd"
sio = io.StringIO("a\r\nb", newline=None)
res = sio.read(3)
assert res == "a\nb"
def test_newline_empty(self):
import io
sio = io.StringIO("a\nb\r\nc\rd", newline="")
res = list(sio)
assert res == ["a\n", "b\r\n", "c\r", "d"]
sio.seek(0)
res = sio.read(4)
assert res == "a\nb\r"
res = sio.read(2)
assert res == "\nc"
res = sio.read(1)
assert res == "\r"
sio = io.StringIO(newline="")
res = sio.write("a\n")
assert res == 2
res = sio.write("b\r")
assert res == 2
res = sio.write("\nc")
assert res == 2
res = sio.write("\rd")
assert res == 2
sio.seek(0)
res = list(sio)
assert res == ["a\n", "b\r\n", "c\r", "d"]
def test_newline_lf(self):
import io
sio = io.StringIO("a\nb\r\nc\rd")
res = list(sio)
assert res == ["a\n", "b\r\n", "c\rd"]
def test_newline_cr(self):
import io
sio = io.StringIO("a\nb\r\nc\rd", newline="\r")
res = sio.read()
assert res == "a\rb\r\rc\rd"
sio.seek(0)
res = list(sio)
assert res == ["a\r", "b\r", "\r", "c\r", "d"]
def test_newline_crlf(self):
import io
sio = io.StringIO("a\nb\r\nc\rd", newline="\r\n")
res = sio.read()
assert res == "a\r\nb\r\r\nc\rd"
sio.seek(0)
res = list(sio)
assert res == ["a\r\n", "b\r\r\n", "c\rd"]
def test_newline_property(self):
import io
sio = io.StringIO(newline=None)
assert sio.newlines is None
sio.write("a\n")
assert sio.newlines == "\n"
sio.write("b\r\n")
assert sio.newlines == ("\n", "\r\n")
sio.write("c\rd")
assert sio.newlines == ("\r", "\n", "\r\n")
def test_iterator(self):
import io
s = "1234567890\n"
sio = io.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 = io.StringIO(s * 2)
sio.close()
raises(ValueError, next, sio)
def test_getstate(self):
import io
sio = io.StringIO()
state = sio.__getstate__()
assert len(state) == 4
assert isinstance(state[0], str)
assert isinstance(state[1], str)
assert isinstance(state[2], int)
assert isinstance(state[3], dict)
sio.close()
raises(ValueError, sio.__getstate__)
def test_setstate(self):
import io
sio = io.StringIO()
sio.__setstate__(("no error", "\n", 0, None))
sio.__setstate__(("no error", "", 0, {"spam": 3}))
raises(ValueError, sio.__setstate__, ("", "f", 0, None))
raises(ValueError, sio.__setstate__, ("", "", -1, None))
raises(TypeError, sio.__setstate__, (b"", "", 0, None))
raises(TypeError, sio.__setstate__, ("", "", 0.0, None))
raises(TypeError, sio.__setstate__, ("", "", 0, 0))
raises(TypeError, sio.__setstate__, ("len-test", 0))
raises(TypeError, sio.__setstate__)
raises(TypeError, sio.__setstate__, 0)
sio.close()
raises(ValueError, sio.__setstate__, ("closed", "", 0, None))
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