def test_RandomAccessIoHandle_WriteDataAtPosition2_DataIsWritten(self):
io = StringIO.StringIO("0123456789")
handle = IoHandle(io)
handle.write(2, "--")
self.assertEquals(io.getvalue(), "01--456789")
def test_RandomAccessIoHandle_ReadDataAtPosition3_DataIsReturned(self):
io = StringIO.StringIO("0123456789")
handle = IoHandle(io)
result = handle.read(offset=2, length=3)
self.assertEquals(result, "234")
