def test_close(self):
x = _io._IOBase()
self.assertFalse(x.closed)
self.assertFalse('__IOBase_closed' in dir(x))
x.close()
self.assertTrue(x.closed)
self.assertEqual(True, getattr(x, '__IOBase_closed'))
def test_default_implementations(self):
import _io
file = _io._IOBase()
raises(_io.UnsupportedOperation, file.seek, 0, 1)
raises(_io.UnsupportedOperation, file.fileno)
raises(_io.UnsupportedOperation, file.truncate)
def test_flush(self):
x = _io._IOBase()
x.flush()
x.close()
self.assertRaises(ValueError, x.flush)
# the value of __IOBase_closed does not matter, only its presence
setattr(x, '__IOBase_closed', False)
self.assertRaises(ValueError, x.flush)
delattr(x, '__IOBase_closed')
x.flush()
def test_check_writable(self):
self.assertFalse(_io._IOBase().writable())
ret_val = False
class X(_io._IOBase):
def writable(self):
return ret_val
self.assertRaises(_io.UnsupportedOperation, X()._checkWritable)
ret_val = True
self.assertTrue(X()._checkWritable())
ret_val = 42 # _checkWritable accepts only explicit True
self.assertRaises(_io.UnsupportedOperation, X()._checkWritable)
ret_val = (1, )
self.assertRaises(_io.UnsupportedOperation, X()._checkWritable)
def test_default_implementations(self):
import _io
file = _io._IOBase()
raises(_io.UnsupportedOperation, file.seek, 0, 1)
raises(_io.UnsupportedOperation, file.fileno)
raises(_io.UnsupportedOperation, file.truncate)
def test_iobase_ctor_accepts_anything(self):
_io._IOBase()
_io._IOBase(1, '2', kw=3)
def test_writelines_err(self):
self.assertRaises(AttributeError,
_io._IOBase().writelines, ['aaa', 'bbb'])
def test_iter(self):
x = _io._IOBase()
self.assertIs(x, x.__iter__())
x.close()
self.assertRaises(ValueError, x.__iter__)
def test_isatty(self):
x = _io._IOBase()
self.assertFalse(x.isatty())
x.close()
self.assertRaises(ValueError, x.isatty)
def test_exit_accepts_varargs(self):
x = _io._IOBase()
x.__exit__(1, 2, 3)
with self.assertRaises(TypeError):
x.__exit__(kw=1)
def test_unsupported(self):
self.assertRaises(_io.UnsupportedOperation, _io._IOBase().seek)
self.assertRaises(_io.UnsupportedOperation, _io._IOBase().truncate)
self.assertRaises(_io.UnsupportedOperation, _io._IOBase().fileno)
import _io
i = _io._IOBase()
i.close()
try:
i.fileno()
except _io.UnsupportedOperation:
try:
i.readline(1)
except AttributeError:
try:
i.readlines(0)
except ValueError:
try:
i.seek()
except _io.UnsupportedOperation:
try:
i.tell()
except _io.UnsupportedOperation:
try:
i.truncate()
except _io.UnsupportedOperation:
try:
i.writelines([])
except ValueError:
try:
i.write()
except AttributeError:
try:
i.read()
except AttributeError:
try: