62 lines
2.1 KiB
Python
62 lines
2.1 KiB
Python
# Copyright 2016 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import testtools
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from neutron.common import utils
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from neutron.tests import base
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from neutron.tests.common.exclusive_resources import resource_allocator
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def safe_remove_file(file_path):
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try:
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os.remove(file_path)
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except OSError:
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pass
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class TestResourceAllocator(base.DietTestCase):
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def setUp(self):
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super(TestResourceAllocator, self).setUp()
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self.ra = resource_allocator.ResourceAllocator(
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utils.get_random_string(6), lambda: 42)
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self.addCleanup(safe_remove_file, self.ra._state_file_path)
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def test_allocate_and_release(self):
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# Assert that we can allocate a resource
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resource = self.ra.allocate()
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self.assertEqual('42', resource)
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# Assert that we cannot allocate any more resources, since we're
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# using an allocator that always returns the same value
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with testtools.ExpectedException(ValueError):
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self.ra.allocate()
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# Assert that releasing the resource and allocating again works
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self.ra.release(resource)
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resource = self.ra.allocate()
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self.assertEqual('42', resource)
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def test_file_manipulation(self):
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# The file should not be created until the first allocation
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self.assertFalse(os.path.exists(self.ra._state_file_path))
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resource = self.ra.allocate()
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self.assertTrue(os.path.exists(self.ra._state_file_path))
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# Releasing the last resource should delete the file
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self.ra.release(resource)
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self.assertFalse(os.path.exists(self.ra._state_file_path))
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