'Calling L{_InputStream.readline} with L{None} as an argument returns
one line from the input stream.'

def test_readlineNone(self):

    bytes = 'this    is    one    line\nthis    is    another    line'
    d = self._renderAndReturnReaderResult((lambda input: input.readline(None)), bytes)
    d.addCallback(self.assertEqual, 'this    is    one    line\n')
    return d
