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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Tests for the compression manager."""
from __future__ import unicode_literals
import unittest
from dfvfs.compression import decompressor
from dfvfs.compression import manager
from dfvfs.compression import zlib_decompressor
from dfvfs.lib import definitions
from tests import test_lib as shared_test_lib
class TestDecompressor(decompressor.Decompressor):
"""Decompressor for testing."""
COMPRESSION_METHOD = 'test'
def Decompress(self, compressed_data):
"""Decompresses the compressed data.
Args:
compressed_data (bytes): compressed data.
Returns:
tuple(bytes, bytes): uncompressed data and remaining compressed data.
"""
return b'', b''
class CompressionManagerTest(shared_test_lib.BaseTestCase):
"""Compression manager tests."""
def testDecompressorRegistration(self):
"""Tests the DeregisterDecompressor and DeregisterDecompressor functions."""
# pylint: disable=protected-access
number_of_decompressors = len(manager.CompressionManager._decompressors)
manager.CompressionManager.RegisterDecompressor(TestDecompressor)
self.assertEqual(
len(manager.CompressionManager._decompressors),
number_of_decompressors + 1)
with self.assertRaises(KeyError):
manager.CompressionManager.RegisterDecompressor(TestDecompressor)
manager.CompressionManager.DeregisterDecompressor(TestDecompressor)
self.assertEqual(
len(manager.CompressionManager._decompressors), number_of_decompressors)
with self.assertRaises(KeyError):
manager.CompressionManager.DeregisterDecompressor(TestDecompressor)
def testGetDecompressor(self):
"""Function to test the GetDecompressor function."""
decompressor_object = manager.CompressionManager.GetDecompressor(
definitions.COMPRESSION_METHOD_ZLIB)
self.assertIsInstance(
decompressor_object, zlib_decompressor.ZlibDecompressor)
decompressor_object = manager.CompressionManager.GetDecompressor('bogus')
self.assertIsNone(decompressor_object)
if __name__ == '__main__':
unittest.main()
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