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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Tests for the xz decompressor object."""
import unittest
try:
from dfvfs.compression import xz_decompressor
except ImportError:
xz_decompressor = None
from dfvfs.lib import errors
from tests.compression import test_lib
@unittest.skipIf(xz_decompressor is None, 'requires LZMA compression support')
class LZMADecompressorTestCase(test_lib.DecompressorTestCase):
"""Tests for the lzma decompressor object."""
def testDecompress(self):
"""Tests the Decompress method."""
decompressor = xz_decompressor.LZMADecompressor()
compressed_data = (
b']\x00\x00\x80\x00\xff\xff\xff\xff\xff\xff\xff\xff\x00*\x1a\t\'d\x1c'
b'\x87\x8aO\xcaL\xf4\xf8!\xda\x88\xd8\xff\xff\xeb\xcc\x00')
uncompressed_data, _ = decompressor.Decompress(compressed_data)
expected_uncompressed_data = b'This is a test.'
self.assertEqual(uncompressed_data, expected_uncompressed_data)
# Test to trigger lzma raising EOFError.
with self.assertRaises(errors.BackEndError):
decompressor.Decompress(b'This is a test.')
# Test to trigger lzma raising IOError.
decompressor = xz_decompressor.LZMADecompressor()
with self.assertRaises(errors.BackEndError):
decompressor.Decompress(b'This is a test.')
@unittest.skipIf(xz_decompressor is None, 'requires LZMA compression support')
class XZDecompressorTestCase(test_lib.DecompressorTestCase):
"""Tests for the xz decompressor object."""
def testDecompress(self):
"""Tests the Decompress method."""
decompressor = xz_decompressor.XZDecompressor()
compressed_data = (
b'\xfd7zXZ\x00\x00\x01i"\xde6\x02\xc0\x13\x0f!\x01\x16\x00\xc0\xb7\xdc'
b'\xe9\x01\x00\x0eThis is a test.\x00\x00]\xc9\xc3\xc6\x00\x01#\x0f\xdb'
b'\xdf\x90\x0e\x90B\x99\r\x01\x00\x00\x00\x00\x01YZ')
uncompressed_data, _ = decompressor.Decompress(compressed_data)
expected_uncompressed_data = b'This is a test.'
self.assertEqual(uncompressed_data, expected_uncompressed_data)
# Test to trigger xz raising EOFError.
with self.assertRaises(errors.BackEndError):
decompressor.Decompress(b'This is a test.')
# Test to trigger xz raising IOError.
decompressor = xz_decompressor.XZDecompressor()
with self.assertRaises(errors.BackEndError):
decompressor.Decompress(b'This is a test.')
if __name__ == '__main__':
unittest.main()
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