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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