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'''Tests block operations.'''
from StringIO import StringIO
import unittest
from rsa import blocks
class VarintTest(unittest.TestCase):
def test_read_varint(self):
encoded = '\xac\x02crummy'
infile = StringIO(encoded)
(decoded, read) = blocks.read_varint(infile)
# Test the returned values
self.assertEqual(300, decoded)
self.assertEqual(2, read)
# The rest of the file should be untouched
self.assertEqual('crummy', infile.read())
def test_read_zero(self):
encoded = '\x00crummy'
infile = StringIO(encoded)
(decoded, read) = blocks.read_varint(infile)
# Test the returned values
self.assertEqual(0, decoded)
self.assertEqual(1, read)
# The rest of the file should be untouched
self.assertEqual('crummy', infile.read())
def test_write_varint(self):
expected = '\xac\x02'
outfile = StringIO()
written = blocks.write_varint(outfile, 300)
# Test the returned values
self.assertEqual(expected, outfile.getvalue())
self.assertEqual(2, written)
def test_write_zero(self):
outfile = StringIO()
written = blocks.write_varint(outfile, 0)
# Test the returned values
self.assertEqual('\x00', outfile.getvalue())
self.assertEqual(1, written)
class VarblockTest(unittest.TestCase):
def test_yield_varblock(self):
infile = StringIO('\x01\x0512345\x06Sybren')
varblocks = list(blocks.yield_varblocks(infile))
self.assertEqual(['12345', 'Sybren'], varblocks)
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