1#  Licensed under the Apache License, Version 2.0 (the "License"); you may
2#  not use this file except in compliance with the License. You may obtain
3#  a copy of the License at
4#
5#       http://www.apache.org/licenses/LICENSE-2.0
6#
7#  Unless required by applicable law or agreed to in writing, software
8#  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
9#  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
10#  License for the specific language governing permissions and limitations
11#  under the License.
12
13"""Tests for failure loading callback
14"""
15from testtools.matchers import GreaterThan
16import mock
17
18from stevedore import extension
19from stevedore import named
20from stevedore.tests import utils
21
22
23class TestCallback(utils.TestCase):
24    def test_extension_failure_custom_callback(self):
25        errors = []
26
27        def failure_callback(manager, entrypoint, error):
28            errors.append((manager, entrypoint, error))
29
30        em = extension.ExtensionManager('stevedore.test.extension',
31                                        invoke_on_load=True,
32                                        on_load_failure_callback=
33                                        failure_callback)
34        extensions = list(em.extensions)
35        self.assertThat(len(extensions), GreaterThan(0))
36        self.assertEqual(len(errors), 2)
37        for manager, entrypoint, error in errors:
38            self.assertIs(manager, em)
39            self.assertIsInstance(error, (IOError, ImportError))
40
41    @mock.patch('stevedore.named.NamedExtensionManager._load_plugins')
42    def test_missing_entrypoints_callback(self, load_fn):
43        errors = set()
44
45        def callback(names):
46            errors.update(names)
47
48        load_fn.return_value = [
49            extension.Extension('foo', None, None, None)
50        ]
51        named.NamedExtensionManager('stevedore.test.extension',
52                                    names=['foo', 'bar'],
53                                    invoke_on_load=True,
54                                    on_missing_entrypoints_callback=callback)
55        self.assertEqual(errors, {'bar'})
56