33b12d3c18
Adds a new (simple) importutils.try_import function which
can return a module name or a default (by default this is None).
This should help clean up some of our
try:
import foo
except...
blocks in modules.
This commit also drops the dependency on python-extras which is
no longer needed.
Fixes LP Bug #1099501.
Change-Id: I8591f79983bdad67a50d1aaae6dce8428dfce084
120 lines
5.0 KiB
Python
120 lines
5.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 OpenStack LLC.
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# All Rights Reserved.
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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 datetime
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import sys
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import unittest
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from openstack.common import importutils
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class ImportUtilsTest(unittest.TestCase):
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# NOTE(jkoelker) There has GOT to be a way to test this. But mocking
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# __import__ is the devil. Right now we just make
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# sure we can import something from the stdlib
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def test_import_class(self):
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dt = importutils.import_class('datetime.datetime')
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self.assertEqual(sys.modules['datetime'].datetime, dt)
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def test_import_bad_class(self):
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self.assertRaises(ImportError, importutils.import_class,
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'lol.u_mad.brah')
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def test_import_module(self):
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dt = importutils.import_module('datetime')
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self.assertEqual(sys.modules['datetime'], dt)
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def test_import_object_optional_arg_not_present(self):
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obj = importutils.import_object('tests.unit.fake.FakeDriver')
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self.assertTrue(obj.__class__.__name__, 'FakeDriver')
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def test_import_object_optional_arg_present(self):
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obj = importutils.import_object('tests.unit.fake.FakeDriver',
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first_arg=False)
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self.assertTrue(obj.__class__.__name__, 'FakeDriver')
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def test_import_object_required_arg_not_present(self):
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# arg 1 isn't optional here
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self.assertRaises(TypeError, importutils.import_object,
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'tests.unit.fake.FakeDriver2')
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def test_import_object_required_arg_present(self):
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obj = importutils.import_object('tests.unit.fake.FakeDriver2',
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first_arg=False)
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self.assertTrue(obj.__class__.__name__, 'FakeDriver2')
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# namespace tests
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def test_import_object_ns_optional_arg_not_present(self):
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obj = importutils.import_object_ns('tests.unit', 'fake.FakeDriver')
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self.assertTrue(obj.__class__.__name__, 'FakeDriver')
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def test_import_object_ns_optional_arg_present(self):
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obj = importutils.import_object_ns('tests.unit', 'fake.FakeDriver',
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first_arg=False)
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self.assertTrue(obj.__class__.__name__, 'FakeDriver')
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def test_import_object_ns_required_arg_not_present(self):
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# arg 1 isn't optional here
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self.assertRaises(TypeError, importutils.import_object_ns,
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'tests.unit', 'fake.FakeDriver2')
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def test_import_object_ns_required_arg_present(self):
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obj = importutils.import_object_ns('tests.unit', 'fake.FakeDriver2',
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first_arg=False)
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self.assertTrue(obj.__class__.__name__, 'FakeDriver2')
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# namespace tests
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def test_import_object_ns_full_optional_arg_not_present(self):
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obj = importutils.import_object_ns('tests.unit2',
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'tests.unit.fake.FakeDriver')
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self.assertTrue(obj.__class__.__name__, 'FakeDriver')
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def test_import_object_ns_full_optional_arg_present(self):
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obj = importutils.import_object_ns('tests.unit2',
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'tests.unit.fake.FakeDriver',
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first_arg=False)
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self.assertTrue(obj.__class__.__name__, 'FakeDriver')
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def test_import_object_ns_full_required_arg_not_present(self):
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# arg 1 isn't optional here
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self.assertRaises(TypeError, importutils.import_object_ns,
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'tests.unit2', 'tests.unit.fake.FakeDriver2')
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def test_import_object_ns_full_required_arg_present(self):
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obj = importutils.import_object_ns('tests.unit2',
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'tests.unit.fake.FakeDriver2',
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first_arg=False)
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self.assertTrue(obj.__class__.__name__, 'FakeDriver2')
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def test_import_object(self):
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dt = importutils.import_object('datetime.time')
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self.assertTrue(isinstance(dt, sys.modules['datetime'].time))
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def test_import_object_with_args(self):
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dt = importutils.import_object('datetime.datetime', 2012, 4, 5)
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self.assertTrue(isinstance(dt, sys.modules['datetime'].datetime))
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self.assertEqual(dt, datetime.datetime(2012, 4, 5))
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def test_try_import(self):
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dt = importutils.try_import('datetime')
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self.assertEqual(sys.modules['datetime'], dt)
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def test_try_import_returns_default(self):
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foo = importutils.try_import('foo.bar')
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self.assertEqual(None, foo)
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