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#!/usr/bin/env python
# Copyright 2018 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# pylint: disable=protected-access
import time
import unittest
from devil import devil_env
from devil.utils import lazy
from devil.utils import timeout_retry
with devil_env.SysPath(devil_env.PYMOCK_PATH):
import mock
class DynamicSideEffect(object):
"""A helper object for handling a sequence of single-use side effects."""
def __init__(self, side_effects):
self._side_effects = iter(side_effects or [])
def __call__(self):
val = next(self._side_effects)()
if isinstance(val, Exception):
raise val
return val
class WeakConstantTest(unittest.TestCase):
def testUninitialized(self):
"""Ensure that the first read calls the initializer."""
initializer = mock.Mock(return_value='initializer called')
test_constant = lazy.WeakConstant(initializer)
self.assertEquals(
'initializer called',
test_constant.read())
initializer.assert_called_once_with()
def testInitialized(self):
"""Ensure that reading doesn't reinitialize the value."""
initializer = mock.Mock(return_value='initializer called')
test_constant = lazy.WeakConstant(initializer)
test_constant._initialized.set()
test_constant._val = 'initializer not called'
self.assertEquals(
'initializer not called',
test_constant.read())
self.assertFalse(initializer.mock_calls) # assert not called
def testFirstCallHangs(self):
"""Ensure that reading works even if the first initializer call hangs."""
dyn = DynamicSideEffect([
lambda: time.sleep(10),
lambda: 'second try worked!'
])
initializer = mock.Mock(side_effect=dyn)
test_constant = lazy.WeakConstant(initializer)
self.assertEquals(
'second try worked!',
timeout_retry.Run(test_constant.read, 1, 1))
initializer.assert_has_calls([mock.call(), mock.call()])
if __name__ == '__main__':
unittest.main()
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