/brz/remove-bazaar

# Copyright (C) 2005, 2007 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Tests for plugins"""

# XXX: There are no plugin tests at the moment because the plugin module

# affects the global state of the process.  See bzrlib/plugins.py for more

# comments.

import logging

import os

from StringIO import StringIO

import sys

import zipfile

from bzrlib import plugin, tests

import bzrlib.plugin

import bzrlib.plugins

import bzrlib.commands

import bzrlib.help

from bzrlib.symbol_versioning import one_three

from bzrlib.tests import (

    TestCase,

    TestCaseInTempDir,

    TestUtil,

    )

from bzrlib.osutils import pathjoin, abspath, normpath

PLUGIN_TEXT = """\

import bzrlib.commands

class cmd_myplug(bzrlib.commands.Command):

    '''Just a simple test plugin.'''

    aliases = ['mplg']

    def run(self):

        print 'Hello from my plugin'

"""

# TODO: Write a test for plugin decoration of commands.

class TestLoadingPlugins(TestCaseInTempDir):

    activeattributes = {}

    def test_plugins_with_the_same_name_are_not_loaded(self):

        # This test tests that having two plugins in different directories does

        # not result in both being loaded when they have the same name.  get a

        # file name we can use which is also a valid attribute for accessing in

        # activeattributes. - we cannot give import parameters.

        tempattribute = "0"

        self.failIf(tempattribute in self.activeattributes)

        # set a place for the plugins to record their loading, and at the same

        # time validate that the location the plugins should record to is

        # valid and correct.

        bzrlib.tests.test_plugins.TestLoadingPlugins.activeattributes \

            [tempattribute] = []

        self.failUnless(tempattribute in self.activeattributes)

        # create two plugin directories

        os.mkdir('first')

        os.mkdir('second')

        # write a plugin that will record when its loaded in the 

        # tempattribute list.

        template = ("from bzrlib.tests.test_plugins import TestLoadingPlugins\n"

                    "TestLoadingPlugins.activeattributes[%r].append('%s')\n")

        outfile = open(os.path.join('first', 'plugin.py'), 'w')

        try:

            outfile.write(template % (tempattribute, 'first'))

            outfile.write('\n')

        finally:

            outfile.close()

        outfile = open(os.path.join('second', 'plugin.py'), 'w')

        try:

            outfile.write(template % (tempattribute, 'second'))

            outfile.write('\n')

        finally:

            outfile.close()

        try:

            bzrlib.plugin.load_from_path(['first', 'second'])

            self.assertEqual(['first'], self.activeattributes[tempattribute])

        finally:

            # remove the plugin 'plugin'

            del self.activeattributes[tempattribute]

            if 'bzrlib.plugins.plugin' in sys.modules:

                del sys.modules['bzrlib.plugins.plugin']

            if getattr(bzrlib.plugins, 'plugin', None):

                del bzrlib.plugins.plugin

        self.failIf(getattr(bzrlib.plugins, 'plugin', None))

    def test_plugins_from_different_dirs_can_demand_load(self):

        # This test tests that having two plugins in different

        # directories with different names allows them both to be loaded, when

        # we do a direct import statement.

        # Determine a file name we can use which is also a valid attribute

        # for accessing in activeattributes. - we cannot give import parameters.

        tempattribute = "different-dirs"

        self.failIf(tempattribute in self.activeattributes)

        # set a place for the plugins to record their loading, and at the same

        # time validate that the location the plugins should record to is

        # valid and correct.

        bzrlib.tests.test_plugins.TestLoadingPlugins.activeattributes \

            [tempattribute] = []

        self.failUnless(tempattribute in self.activeattributes)

        # create two plugin directories

        os.mkdir('first')

        os.mkdir('second')

        # write plugins that will record when they are loaded in the 

        # tempattribute list.

        template = ("from bzrlib.tests.test_plugins import TestLoadingPlugins\n"

                    "TestLoadingPlugins.activeattributes[%r].append('%s')\n")

        outfile = open(os.path.join('first', 'pluginone.py'), 'w')

        try:

            outfile.write(template % (tempattribute, 'first'))

            outfile.write('\n')

        finally:

            outfile.close()

        outfile = open(os.path.join('second', 'plugintwo.py'), 'w')

        try:

            outfile.write(template % (tempattribute, 'second'))

            outfile.write('\n')

        finally:

            outfile.close()

        oldpath = bzrlib.plugins.__path__

        try:

            bzrlib.plugins.__path__ = ['first', 'second']

            exec "import bzrlib.plugins.pluginone"

            self.assertEqual(['first'], self.activeattributes[tempattribute])

            exec "import bzrlib.plugins.plugintwo"

            self.assertEqual(['first', 'second'],

                self.activeattributes[tempattribute])

        finally:

            # remove the plugin 'plugin'

            del self.activeattributes[tempattribute]

            if getattr(bzrlib.plugins, 'pluginone', None):

                del bzrlib.plugins.pluginone

            if getattr(bzrlib.plugins, 'plugintwo', None):

                del bzrlib.plugins.plugintwo

        self.failIf(getattr(bzrlib.plugins, 'pluginone', None))

        self.failIf(getattr(bzrlib.plugins, 'plugintwo', None))

    def test_plugins_can_load_from_directory_with_trailing_slash(self):

        # This test tests that a plugin can load from a directory when the

        # directory in the path has a trailing slash.

        # check the plugin is not loaded already

        self.failIf(getattr(bzrlib.plugins, 'ts_plugin', None))

        tempattribute = "trailing-slash"

        self.failIf(tempattribute in self.activeattributes)

        # set a place for the plugin to record its loading, and at the same

        # time validate that the location the plugin should record to is

        # valid and correct.

        bzrlib.tests.test_plugins.TestLoadingPlugins.activeattributes \

            [tempattribute] = []

        self.failUnless(tempattribute in self.activeattributes)

        # create a directory for the plugin

        os.mkdir('plugin_test')

        # write a plugin that will record when its loaded in the 

        # tempattribute list.

        template = ("from bzrlib.tests.test_plugins import TestLoadingPlugins\n"

                    "TestLoadingPlugins.activeattributes[%r].append('%s')\n")

        outfile = open(os.path.join('plugin_test', 'ts_plugin.py'), 'w')

        try:

            outfile.write(template % (tempattribute, 'plugin'))

            outfile.write('\n')

        finally:

            outfile.close()

        try:

            bzrlib.plugin.load_from_path(['plugin_test'+os.sep])

            self.assertEqual(['plugin'], self.activeattributes[tempattribute])

        finally:

            # remove the plugin 'plugin'

            del self.activeattributes[tempattribute]

            if getattr(bzrlib.plugins, 'ts_plugin', None):

                del bzrlib.plugins.ts_plugin

        self.failIf(getattr(bzrlib.plugins, 'ts_plugin', None))

    def load_and_capture(self, name):

        """Load plugins from '.' capturing the output.

        :param name: The name of the plugin.

        :return: A string with the log from the plugin loading call.

        """

        # Capture output

        stream = StringIO()

        try:

            handler = logging.StreamHandler(stream)

            log = logging.getLogger('bzr')

            log.addHandler(handler)

            try:

                try:

                    bzrlib.plugin.load_from_path(['.'])

                finally:

                    if 'bzrlib.plugins.%s' % name in sys.modules:

                        del sys.modules['bzrlib.plugins.%s' % name]

                    if getattr(bzrlib.plugins, name, None):

                        delattr(bzrlib.plugins, name)

            finally:

                # Stop capturing output

                handler.flush()

                handler.close()

                log.removeHandler(handler)

            return stream.getvalue()

        finally:

            stream.close()

    def test_plugin_with_bad_api_version_reports(self):

        # This plugin asks for bzrlib api version 1.0.0, which is not supported

        # anymore.

        name = 'wants100.py'

        f = file(name, 'w')

        try:

            f.write("import bzrlib.api\n"

                "bzrlib.api.require_any_api(bzrlib, [(1, 0, 0)])\n")

        finally:

            f.close()

        log = self.load_and_capture(name)

        self.assertContainsRe(log,

            r"It requested API version")

    def test_plugin_with_bad_name_does_not_load(self):

        # The file name here invalid for a python module.

        name = 'bzr-bad plugin-name..py'

        file(name, 'w').close()

        log = self.load_and_capture(name)

        self.assertContainsRe(log,

            r"Unable to load 'bzr-bad plugin-name\.' in '\.' as a plugin "

            "because the file path isn't a valid module name; try renaming "

            "it to 'bad_plugin_name_'\.")

class TestPlugins(TestCaseInTempDir):

    def setup_plugin(self, source=""):

        # This test tests a new plugin appears in bzrlib.plugin.plugins().

        # check the plugin is not loaded already

        self.failIf(getattr(bzrlib.plugins, 'plugin', None))

        # write a plugin that _cannot_ fail to load.

        file('plugin.py', 'w').write(source + '\n')

        self.addCleanup(self.teardown_plugin)

        bzrlib.plugin.load_from_path(['.'])

    def teardown_plugin(self):

        # remove the plugin 'plugin'

        if 'bzrlib.plugins.plugin' in sys.modules:

            del sys.modules['bzrlib.plugins.plugin']

        if getattr(bzrlib.plugins, 'plugin', None):

            del bzrlib.plugins.plugin

        self.failIf(getattr(bzrlib.plugins, 'plugin', None))

    def test_plugin_appears_in_plugins(self):

        self.setup_plugin()

        self.failUnless('plugin' in bzrlib.plugin.plugins())

        self.failUnless(getattr(bzrlib.plugins, 'plugin', None))

        plugins = bzrlib.plugin.plugins()

        plugin = plugins['plugin']

        self.assertIsInstance(plugin, bzrlib.plugin.PlugIn)

        self.assertEqual(bzrlib.plugins.plugin, plugin.module)

    def test_trivial_plugin_get_path(self):

        self.setup_plugin()

        plugins = bzrlib.plugin.plugins()

        plugin = plugins['plugin']

        plugin_path = self.test_dir + '/plugin.py'

        self.assertIsSameRealPath(plugin_path, normpath(plugin.path()))

    def test_plugin_get_path_py_not_pyc(self):

        self.setup_plugin()         # after first import there will be plugin.pyc

        self.teardown_plugin()

        bzrlib.plugin.load_from_path(['.']) # import plugin.pyc

        plugins = bzrlib.plugin.plugins()

        plugin = plugins['plugin']

        plugin_path = self.test_dir + '/plugin.py'

        self.assertIsSameRealPath(plugin_path, normpath(plugin.path()))

    def test_plugin_get_path_pyc_only(self):

        self.setup_plugin()         # after first import there will be plugin.pyc

        self.teardown_plugin()

        os.unlink(self.test_dir + '/plugin.py')

        bzrlib.plugin.load_from_path(['.']) # import plugin.pyc

        plugins = bzrlib.plugin.plugins()

        plugin = plugins['plugin']

        if __debug__:

            plugin_path = self.test_dir + '/plugin.pyc'

        else:

            plugin_path = self.test_dir + '/plugin.pyo'

        self.assertIsSameRealPath(plugin_path, normpath(plugin.path()))

    def test_no_test_suite_gives_None_for_test_suite(self):

        self.setup_plugin()

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual(None, plugin.test_suite())

    def test_test_suite_gives_test_suite_result(self):

        source = """def test_suite(): return 'foo'"""

        self.setup_plugin(source)

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual('foo', plugin.test_suite())

    def test_no_load_plugin_tests_gives_None_for_load_plugin_tests(self):

        self.setup_plugin()

        loader = TestUtil.TestLoader()

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual(None, plugin.load_plugin_tests(loader))

    def test_load_plugin_tests_gives_load_plugin_tests_result(self):

        source = """

def load_tests(standard_tests, module, loader):

    return 'foo'"""

        self.setup_plugin(source)

        loader = TestUtil.TestLoader()

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual('foo', plugin.load_plugin_tests(loader))

    def test_no_version_info(self):

        self.setup_plugin()

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual(None, plugin.version_info())

    def test_with_version_info(self):

        self.setup_plugin("version_info = (1, 2, 3, 'dev', 4)")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual((1, 2, 3, 'dev', 4), plugin.version_info())

    def test_short_version_info_gets_padded(self):

        # the gtk plugin has version_info = (1,2,3) rather than the 5-tuple.

        # so we adapt it

        self.setup_plugin("version_info = (1, 2, 3)")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual((1, 2, 3, 'final', 0), plugin.version_info())

    def test_no_version_info___version__(self):

        self.setup_plugin()

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual("unknown", plugin.__version__)

    def test_str__version__with_version_info(self):

        self.setup_plugin("version_info = '1.2.3'")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual("1.2.3", plugin.__version__)

    def test_noniterable__version__with_version_info(self):

        self.setup_plugin("version_info = (1)")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual("1", plugin.__version__)

    def test_1__version__with_version_info(self):

        self.setup_plugin("version_info = (1,)")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual("1", plugin.__version__)

    def test_1_2__version__with_version_info(self):

        self.setup_plugin("version_info = (1, 2)")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual("1.2", plugin.__version__)

    def test_1_2_3__version__with_version_info(self):

        self.setup_plugin("version_info = (1, 2, 3)")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual("1.2.3", plugin.__version__)

    def test_candidate__version__with_version_info(self):

        self.setup_plugin("version_info = (1, 2, 3, 'candidate', 1)")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual("1.2.3rc1", plugin.__version__)

    def test_dev__version__with_version_info(self):

        self.setup_plugin("version_info = (1, 2, 3, 'dev', 0)")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual("1.2.3dev", plugin.__version__)

    def test_dev_fallback__version__with_version_info(self):

        self.setup_plugin("version_info = (1, 2, 3, 'dev', 4)")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual("1.2.3.dev.4", plugin.__version__)

    def test_final__version__with_version_info(self):

        self.setup_plugin("version_info = (1, 2, 3, 'final', 0)")

        plugin = bzrlib.plugin.plugins()['plugin']

        self.assertEqual("1.2.3", plugin.__version__)

class TestPluginHelp(TestCaseInTempDir):

    def split_help_commands(self):

        help = {}

        current = None

        for line in self.run_bzr('help commands')[0].splitlines():

            if not line.startswith(' '):

                current = line.split()[0]

            help[current] = help.get(current, '') + line

        return help

    def test_plugin_help_builtins_unaffected(self):

        # Check we don't get false positives

        help_commands = self.split_help_commands()

        for cmd_name in bzrlib.commands.builtin_command_names():

            if cmd_name in bzrlib.commands.plugin_command_names():

                continue

            try:

                help = bzrlib.commands.get_cmd_object(cmd_name).get_help_text()

            except NotImplementedError:

                # some commands have no help

                pass

            else:

                self.assertNotContainsRe(help, 'plugin "[^"]*"')

            if cmd_name in help_commands.keys():

                # some commands are hidden

                help = help_commands[cmd_name]

                self.assertNotContainsRe(help, 'plugin "[^"]*"')

    def test_plugin_help_shows_plugin(self):

        # Create a test plugin

        os.mkdir('plugin_test')

        f = open(pathjoin('plugin_test', 'myplug.py'), 'w')

        f.write(PLUGIN_TEXT)

        f.close()

        try:

            # Check its help

            bzrlib.plugin.load_from_path(['plugin_test'])

            bzrlib.commands.register_command( bzrlib.plugins.myplug.cmd_myplug)

            help = self.run_bzr('help myplug')[0]

            self.assertContainsRe(help, 'plugin "myplug"')

            help = self.split_help_commands()['myplug']

            self.assertContainsRe(help, '\[myplug\]')

        finally:

            # unregister command

            if 'myplug' in bzrlib.commands.plugin_cmds:

                bzrlib.commands.plugin_cmds.remove('myplug')

            # remove the plugin 'myplug'

            if getattr(bzrlib.plugins, 'myplug', None):

                delattr(bzrlib.plugins, 'myplug')

class TestPluginFromZip(TestCaseInTempDir):

    def make_zipped_plugin(self, zip_name, filename):

        z = zipfile.ZipFile(zip_name, 'w')

        z.writestr(filename, PLUGIN_TEXT)

        z.close()

    def check_plugin_load(self, zip_name, plugin_name):

        self.assertFalse(plugin_name in dir(bzrlib.plugins),

                         'Plugin already loaded')

        old_path = bzrlib.plugins.__path__

        try:

            # this is normally done by load_plugins -> set_plugins_path

            bzrlib.plugins.__path__ = [zip_name]

            self.applyDeprecated(one_three,

                bzrlib.plugin.load_from_zip, zip_name)

            self.assertTrue(plugin_name in dir(bzrlib.plugins),

                            'Plugin is not loaded')

        finally:

            # unregister plugin

            if getattr(bzrlib.plugins, plugin_name, None):

                delattr(bzrlib.plugins, plugin_name)

                del sys.modules['bzrlib.plugins.' + plugin_name]

            bzrlib.plugins.__path__ = old_path

    def test_load_module(self):

        self.make_zipped_plugin('./test.zip', 'ziplug.py')

        self.check_plugin_load('./test.zip', 'ziplug')

    def test_load_package(self):

        self.make_zipped_plugin('./test.zip', 'ziplug/__init__.py')

        self.check_plugin_load('./test.zip', 'ziplug')

class TestSetPluginsPath(TestCase):

    def test_set_plugins_path(self):

        """set_plugins_path should set the module __path__ correctly."""

        old_path = bzrlib.plugins.__path__

        try:

            bzrlib.plugins.__path__ = []

            expected_path = bzrlib.plugin.set_plugins_path()

            self.assertEqual(expected_path, bzrlib.plugins.__path__)

        finally:

            bzrlib.plugins.__path__ = old_path

    def test_set_plugins_path_with_trailing_slashes(self):

        """set_plugins_path should set the module __path__ based on

        BZR_PLUGIN_PATH after removing all trailing slashes."""

        old_path = bzrlib.plugins.__path__

        old_env = os.environ.get('BZR_PLUGIN_PATH')

        try:

            bzrlib.plugins.__path__ = []

            os.environ['BZR_PLUGIN_PATH'] = "first\\//\\" + os.pathsep + \

                "second/\\/\\/"

            bzrlib.plugin.set_plugins_path()

            # We expect our nominated paths to have all path-seps removed,

            # and this is testing only that.

            expected_path = ['first', 'second']

            self.assertEqual(expected_path,

                bzrlib.plugins.__path__[:len(expected_path)])

        finally:

            bzrlib.plugins.__path__ = old_path

            if old_env is not None:

                os.environ['BZR_PLUGIN_PATH'] = old_env

            else:

                del os.environ['BZR_PLUGIN_PATH']

class TestHelpIndex(tests.TestCase):

    """Tests for the PluginsHelpIndex class."""

    def test_default_constructable(self):

        index = plugin.PluginsHelpIndex()

    def test_get_topics_None(self):

        """Searching for None returns an empty list."""

        index = plugin.PluginsHelpIndex()

        self.assertEqual([], index.get_topics(None))

    def test_get_topics_for_plugin(self):

        """Searching for plugin name gets its docstring."""

        index = plugin.PluginsHelpIndex()

        # make a new plugin here for this test, even if we're run with

        # --no-plugins

        self.assertFalse(sys.modules.has_key('bzrlib.plugins.demo_module'))

        demo_module = FakeModule('', 'bzrlib.plugins.demo_module')

        sys.modules['bzrlib.plugins.demo_module'] = demo_module

        try:

            topics = index.get_topics('demo_module')

            self.assertEqual(1, len(topics))

            self.assertIsInstance(topics[0], plugin.ModuleHelpTopic)

            self.assertEqual(demo_module, topics[0].module)

        finally:

            del sys.modules['bzrlib.plugins.demo_module']

    def test_get_topics_no_topic(self):

        """Searching for something that is not a plugin returns []."""

        # test this by using a name that cannot be a plugin - its not

        # a valid python identifier.

        index = plugin.PluginsHelpIndex()

        self.assertEqual([], index.get_topics('nothing by this name'))

    def test_prefix(self):

        """PluginsHelpIndex has a prefix of 'plugins/'."""

        index = plugin.PluginsHelpIndex()

        self.assertEqual('plugins/', index.prefix)

    def test_get_plugin_topic_with_prefix(self):

        """Searching for plugins/demo_module returns help."""

        index = plugin.PluginsHelpIndex()

        self.assertFalse(sys.modules.has_key('bzrlib.plugins.demo_module'))

        demo_module = FakeModule('', 'bzrlib.plugins.demo_module')

        sys.modules['bzrlib.plugins.demo_module'] = demo_module

        try:

            topics = index.get_topics('plugins/demo_module')

            self.assertEqual(1, len(topics))

            self.assertIsInstance(topics[0], plugin.ModuleHelpTopic)

            self.assertEqual(demo_module, topics[0].module)

        finally:

            del sys.modules['bzrlib.plugins.demo_module']

class FakeModule(object):

    """A fake module to test with."""

    def __init__(self, doc, name):

        self.__doc__ = doc

        self.__name__ = name

class TestModuleHelpTopic(tests.TestCase):

    """Tests for the ModuleHelpTopic class."""

    def test_contruct(self):

        """Construction takes the module to document."""

        mod = FakeModule('foo', 'foo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual(mod, topic.module)

    def test_get_help_text_None(self):

        """A ModuleHelpTopic returns the docstring for get_help_text."""

        mod = FakeModule(None, 'demo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual("Plugin 'demo' has no docstring.\n",

            topic.get_help_text())

    def test_get_help_text_no_carriage_return(self):

        """ModuleHelpTopic.get_help_text adds a \n if needed."""

        mod = FakeModule('one line of help', 'demo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual("one line of help\n",

            topic.get_help_text())

    def test_get_help_text_carriage_return(self):

        """ModuleHelpTopic.get_help_text adds a \n if needed."""

        mod = FakeModule('two lines of help\nand more\n', 'demo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual("two lines of help\nand more\n",

            topic.get_help_text())

    def test_get_help_text_with_additional_see_also(self):

        mod = FakeModule('two lines of help\nand more', 'demo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual("two lines of help\nand more\nSee also: bar, foo\n",

            topic.get_help_text(['foo', 'bar']))

    def test_get_help_topic(self):

        """The help topic for a plugin is its module name."""

        mod = FakeModule('two lines of help\nand more', 'bzrlib.plugins.demo')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual('demo', topic.get_help_topic())

        mod = FakeModule('two lines of help\nand more', 'bzrlib.plugins.foo_bar')

        topic = plugin.ModuleHelpTopic(mod)

        self.assertEqual('foo_bar', topic.get_help_topic())

def clear_plugins(test_case):

    old_plugins_path = bzrlib.plugins.__path__

    bzrlib.plugins.__path__ = []

    plugin._loaded = False

    def restore_plugins():

        bzrlib.plugins.__path__ = old_plugins_path

        plugin._loaded = False

    test_case.addCleanup(restore_plugins)

class TestPluginPaths(tests.TestCase):

    def test_set_plugins_path_with_args(self):

        clear_plugins(self)