test_pop3.py 文件源码

def testLineBuffering(self):
        """
        Test creating a LineBuffer and feeding it some lines.  The lines should
        build up in its internal buffer for a while and then get spat out to
        the writer.
        """
        output = []
        input = iter(itertools.cycle(['012', '345', '6', '7', '8', '9']))
        c = pop3._IteratorBuffer(output.extend, input, 6)
        i = iter(c)
        self.assertEquals(output, []) # nothing is buffer
        i.next()
        self.assertEquals(output, []) # '012' is buffered
        i.next()
        self.assertEquals(output, []) # '012345' is buffered
        i.next()
        self.assertEquals(output, ['012', '345', '6']) # nothing is buffered
        for n in range(5):
            i.next()
        self.assertEquals(output, ['012', '345', '6', '7', '8', '9', '012', '345'])