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