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#!/usr/bin/python
# -*- coding: utf-8 -*-
"""Tests for the path specification resolver."""
import unittest
from dfvfs.resolver import resolver
from tests import test_lib as shared_test_lib
from tests.resolver import test_lib
class ResolverTest(shared_test_lib.BaseTestCase):
"""Class to test the path specification resolver object."""
# pylint: disable=protected-access
def testHelperRegistration(self):
"""Tests the DeregisterHelper and DeregisterHelper functions."""
number_of_resolver_helpers = len(resolver.Resolver._resolver_helpers)
resolver.Resolver.RegisterHelper(test_lib.TestResolverHelper)
self.assertEqual(
len(resolver.Resolver._resolver_helpers),
number_of_resolver_helpers + 1)
with self.assertRaises(KeyError):
resolver.Resolver.RegisterHelper(test_lib.TestResolverHelper)
resolver.Resolver.DeregisterHelper(test_lib.TestResolverHelper)
self.assertEqual(
len(resolver.Resolver._resolver_helpers), number_of_resolver_helpers)
if __name__ == '__main__':
unittest.main()
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