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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Tests for the data slice interface for file-like objects."""
from __future__ import unicode_literals
import unittest
from dfvfs.file_io import os_file_io
from dfvfs.helpers import data_slice
from dfvfs.path import os_path_spec
from dfvfs.resolver import context
from tests import test_lib as shared_test_lib
class TextFileTest(shared_test_lib.BaseTestCase):
"""Tests the data slice interface for file-like objects."""
def setUp(self):
"""Sets up the needed objects used throughout the test."""
self._resolver_context = context.Context()
def testGetItems(self):
"""Test the __getitem__ function."""
test_file = self._GetTestFilePath(['password.txt'])
self._SkipIfPathNotExists(test_file)
test_path_spec = os_path_spec.OSPathSpec(location=test_file)
file_object = os_file_io.OSFile(self._resolver_context)
file_object.open(test_path_spec)
try:
file_data = data_slice.DataSlice(file_object)
# Test linear read.
self.assertEqual(file_data[:20], b'place,user,password\n')
self.assertEqual(file_data[20:44], b'bank,joesmith,superrich\n')
self.assertEqual(file_data[44:64], b'alarm system,-,1234\n')
self.assertEqual(file_data[64:86], b'treasure chest,-,1111\n')
self.assertEqual(file_data[86:], b'uber secret laire,admin,admin\n')
# Test non-linear read.
self.assertEqual(file_data[44:64], b'alarm system,-,1234\n')
self.assertEqual(file_data[86:], b'uber secret laire,admin,admin\n')
self.assertEqual(file_data[20:44], b'bank,joesmith,superrich\n')
self.assertEqual(file_data[:20], b'place,user,password\n')
self.assertEqual(file_data[64:86], b'treasure chest,-,1111\n')
# Test edge cases.
self.assertEqual(file_data[-150:20], b'place,user,password\n')
self.assertEqual(file_data[86:150], b'uber secret laire,admin,admin\n')
with self.assertRaises(TypeError):
file_data['key'] # pylint: disable=pointless-statement
with self.assertRaises(ValueError):
file_data[44:64:2] # pylint: disable=pointless-statement
finally:
file_object.close()
def testLen(self):
"""Test the __len__ function."""
test_file = self._GetTestFilePath(['password.txt'])
self._SkipIfPathNotExists(test_file)
test_path_spec = os_path_spec.OSPathSpec(location=test_file)
file_object = os_file_io.OSFile(self._resolver_context)
file_object.open(test_path_spec)
try:
file_data = data_slice.DataSlice(file_object)
self.assertEqual(len(file_data), 116)
finally:
file_object.close()
if __name__ == '__main__':
unittest.main()
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