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97 lines
3.4 KiB
Python
97 lines
3.4 KiB
Python
4 years ago
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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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"""Tests for stevedore.extension
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"""
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try:
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# For python 3.8 and later
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import importlib.metadata as importlib_metadata
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except ImportError:
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# For everyone else
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import importlib_metadata
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from stevedore import driver
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from stevedore import exception
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from stevedore import extension
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from stevedore.tests import test_extension
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from stevedore.tests import utils
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class TestCallback(utils.TestCase):
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def test_detect_plugins(self):
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em = driver.DriverManager('stevedore.test.extension', 't1')
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names = sorted(em.names())
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self.assertEqual(names, ['t1'])
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def test_call(self):
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def invoke(ext, *args, **kwds):
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return (ext.name, args, kwds)
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em = driver.DriverManager('stevedore.test.extension', 't1')
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result = em(invoke, 'a', b='C')
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self.assertEqual(result, ('t1', ('a',), {'b': 'C'}))
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def test_driver_property_not_invoked_on_load(self):
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em = driver.DriverManager('stevedore.test.extension', 't1',
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invoke_on_load=False)
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d = em.driver
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self.assertIs(d, test_extension.FauxExtension)
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def test_driver_property_invoked_on_load(self):
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em = driver.DriverManager('stevedore.test.extension', 't1',
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invoke_on_load=True)
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d = em.driver
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self.assertIsInstance(d, test_extension.FauxExtension)
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def test_no_drivers(self):
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try:
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driver.DriverManager('stevedore.test.extension.none', 't1')
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except exception.NoMatches as err:
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self.assertIn("No 'stevedore.test.extension.none' driver found",
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str(err))
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def test_bad_driver(self):
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try:
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driver.DriverManager('stevedore.test.extension', 'e2')
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except ImportError:
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pass
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else:
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self.assertEqual(False, "No error raised")
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def test_multiple_drivers(self):
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# The idea for this test was contributed by clayg:
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# https://gist.github.com/clayg/6311348
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extensions = [
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extension.Extension(
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'backend',
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importlib_metadata.EntryPoint(
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'backend', 'pkg1:driver', 'backend'),
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'pkg backend',
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None,
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),
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extension.Extension(
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'backend',
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importlib_metadata.EntryPoint(
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'backend', 'pkg2:driver', 'backend'),
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'pkg backend',
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None,
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),
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]
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try:
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dm = driver.DriverManager.make_test_instance(extensions[0])
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# Call the initialization code that verifies the extension
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dm._init_plugins(extensions)
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except exception.MultipleMatches as err:
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self.assertIn("Multiple", str(err))
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else:
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self.fail('Should have had an error')
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