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import unittest

from httpplus import _readers

def chunkedblock(x, eol='\r\n'):

    r"""Make a chunked transfer-encoding block.

    >>> chunkedblock('hi')

    '2\r\nhi\r\n'

    >>> chunkedblock('hi' * 10)

    '14\r\nhihihihihihihihihihi\r\n'

    >>> chunkedblock('hi', eol='\n')

    '2\nhi\n'

    """

    return ''.join((hex(len(x))[2:], eol, x, eol))

corpus = 'foo\r\nbar\r\nbaz\r\n'

class ChunkedReaderTest(unittest.TestCase):

    def test_many_block_boundaries(self):

        for step in xrange(1, len(corpus)):

            data = ''.join(chunkedblock(corpus[start:start+step]) for

                           start in xrange(0, len(corpus), step))

            for istep in xrange(1, len(data)):

                rdr = _readers.ChunkedReader('\r\n')

                print 'step', step, 'load', istep

                for start in xrange(0, len(data), istep):

                    rdr._load(data[start:start+istep])

                rdr._load(chunkedblock(''))

                self.assertEqual(corpus, rdr.read(len(corpus) + 1))

    def test_small_chunk_blocks_large_wire_blocks(self):

        data = ''.join(map(chunkedblock, corpus)) + chunkedblock('')

        rdr = _readers.ChunkedReader('\r\n')

        for start in xrange(0, len(data), 4):

            d = data[start:start + 4]

            if d:

                rdr._load(d)

        self.assertEqual(corpus, rdr.read(len(corpus)+100))

# no-check-code