'Calling L{_InputStream.read} with an integer returns that many bytes
from the input stream, as long as it is less than or equal to the total
number of bytes available.'

def test_readSome(self):

    bytes = 'hello,    world.'
    d = self._renderAndReturnReaderResult((lambda input: input.read(3)), bytes)
    d.addCallback(self.assertEqual, 'hel')
    return d
