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'''Tests varblock operations.'''
try:
from StringIO import StringIO as BytesIO
except ImportError:
from io import BytesIO
import unittest
import rsa
from rsa._compat import b
from rsa import varblock
class VarintTest(unittest.TestCase):
def test_read_varint(self):
encoded = b('\xac\x02crummy')
infile = BytesIO(encoded)
(decoded, read) = varblock.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(b('crummy'), infile.read())
def test_read_zero(self):
encoded = b('\x00crummy')
infile = BytesIO(encoded)
(decoded, read) = varblock.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(b('crummy'), infile.read())
def test_write_varint(self):
expected = b('\xac\x02')
outfile = BytesIO()
written = varblock.write_varint(outfile, 300)
# Test the returned values
self.assertEqual(expected, outfile.getvalue())
self.assertEqual(2, written)
def test_write_zero(self):
outfile = BytesIO()
written = varblock.write_varint(outfile, 0)
# Test the returned values
self.assertEqual(b('\x00'), outfile.getvalue())
self.assertEqual(1, written)
class VarblockTest(unittest.TestCase):
def test_yield_varblock(self):
infile = BytesIO(b('\x01\x0512345\x06Sybren'))
varblocks = list(varblock.yield_varblocks(infile))
self.assertEqual([b('12345'), b('Sybren')], varblocks)
class FixedblockTest(unittest.TestCase):
def test_yield_fixedblock(self):
infile = BytesIO(b('123456Sybren'))
fixedblocks = list(varblock.yield_fixedblocks(infile, 6))
self.assertEqual([b('123456'), b('Sybren')], fixedblocks)
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