# Copyright (C) 2006-2012 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Tests for the Branch facility that are not interface  tests.

For interface tests see `tests/per_branch/*.py`.

For concrete class tests see this file, and for meta-branch tests
also see this file.
"""

from cStringIO import StringIO

from bzrlib import (
    branch as _mod_branch,
    bzrdir,
    config,
    controldir,
    errors,
    tests,
    trace,
    urlutils,
    )
from bzrlib.branchfmt.fullhistory import (
    BzrBranch5,
    BzrBranchFormat5,
    )


class TestDefaultFormat(tests.TestCase):

    def test_default_format(self):
        # update this if you change the default branch format
        self.assertIsInstance(_mod_branch.format_registry.get_default(),
                _mod_branch.BzrBranchFormat7)

    def test_default_format_is_same_as_bzrdir_default(self):
        # XXX: it might be nice if there was only one place the default was
        # set, but at the moment that's not true -- mbp 20070814 --
        # https://bugs.launchpad.net/bzr/+bug/132376
        self.assertEqual(
            _mod_branch.format_registry.get_default(),
            bzrdir.BzrDirFormat.get_default_format().get_branch_format())

    def test_get_set_default_format(self):
        # set the format and then set it back again
        old_format = _mod_branch.format_registry.get_default()
        _mod_branch.format_registry.set_default(SampleBranchFormat())
        try:
            # the default branch format is used by the meta dir format
            # which is not the default bzrdir format at this point
            dir = bzrdir.BzrDirMetaFormat1().initialize('memory:///')
            result = dir.create_branch()
            self.assertEqual(result, 'A branch')
        finally:
            _mod_branch.format_registry.set_default(old_format)
        self.assertEqual(old_format,
                         _mod_branch.format_registry.get_default())


class TestBranchFormat5(tests.TestCaseWithTransport):
    """Tests specific to branch format 5"""

    def test_branch_format_5_uses_lockdir(self):
        url = self.get_url()
        bdir = bzrdir.BzrDirMetaFormat1().initialize(url)
        bdir.create_repository()
        branch = BzrBranchFormat5().initialize(bdir)
        t = self.get_transport()
        self.log("branch instance is %r" % branch)
        self.assert_(isinstance(branch, BzrBranch5))
        self.assertIsDirectory('.', t)
        self.assertIsDirectory('.bzr/branch', t)
        self.assertIsDirectory('.bzr/branch/lock', t)
        branch.lock_write()
        self.addCleanup(branch.unlock)
        self.assertIsDirectory('.bzr/branch/lock/held', t)

    def test_set_push_location(self):
        conf = config.LocationConfig.from_string('# comment\n', '.', save=True)

        branch = self.make_branch('.', format='knit')
        branch.set_push_location('foo')
        local_path = urlutils.local_path_from_url(branch.base[:-1])
        self.assertFileEqual("# comment\n"
                             "[%s]\n"
                             "push_location = foo\n"
                             "push_location:policy = norecurse\n" % local_path,
                             config.locations_config_filename())

    # TODO RBC 20051029 test getting a push location from a branch in a
    # recursive section - that is, it appends the branch name.


class SampleBranchFormat(_mod_branch.BranchFormatMetadir):
    """A sample format

    this format is initializable, unsupported to aid in testing the
    open and open_downlevel routines.
    """

    @classmethod
    def get_format_string(cls):
        """See BzrBranchFormat.get_format_string()."""
        return "Sample branch format."

    def initialize(self, a_bzrdir, name=None, repository=None,
                   append_revisions_only=None):
        """Format 4 branches cannot be created."""
        t = a_bzrdir.get_branch_transport(self, name=name)
        t.put_bytes('format', self.get_format_string())
        return 'A branch'

    def is_supported(self):
        return False

    def open(self, transport, name=None, _found=False, ignore_fallbacks=False,
             possible_transports=None):
        return "opened branch."


# Demonstrating how lazy loading is often implemented:
# A constant string is created.
SampleSupportedBranchFormatString = "Sample supported branch format."

# And the format class can then reference the constant to avoid skew.
class SampleSupportedBranchFormat(_mod_branch.BranchFormatMetadir):
    """A sample supported format."""

    @classmethod
    def get_format_string(cls):
        """See BzrBranchFormat.get_format_string()."""
        return SampleSupportedBranchFormatString

    def initialize(self, a_bzrdir, name=None, append_revisions_only=None):
        t = a_bzrdir.get_branch_transport(self, name=name)
        t.put_bytes('format', self.get_format_string())
        return 'A branch'

    def open(self, transport, name=None, _found=False, ignore_fallbacks=False,
             possible_transports=None):
        return "opened supported branch."


class SampleExtraBranchFormat(_mod_branch.BranchFormat):
    """A sample format that is not usable in a metadir."""

    def get_format_string(self):
        # This format is not usable in a metadir.
        return None

    def network_name(self):
        # Network name always has to be provided.
        return "extra"

    def initialize(self, a_bzrdir, name=None):
        raise NotImplementedError(self.initialize)

    def open(self, transport, name=None, _found=False, ignore_fallbacks=False,
             possible_transports=None):
        raise NotImplementedError(self.open)


class TestBzrBranchFormat(tests.TestCaseWithTransport):
    """Tests for the BzrBranchFormat facility."""

    def test_find_format(self):
        # is the right format object found for a branch?
        # create a branch with a few known format objects.
        # this is not quite the same as
        self.build_tree(["foo/", "bar/"])
        def check_format(format, url):
            dir = format._matchingbzrdir.initialize(url)
            dir.create_repository()
            format.initialize(dir)
            found_format = _mod_branch.BranchFormatMetadir.find_format(dir)
            self.assertIsInstance(found_format, format.__class__)
        check_format(BzrBranchFormat5(), "bar")

    def test_find_format_factory(self):
        dir = bzrdir.BzrDirMetaFormat1().initialize(self.get_url())
        SampleSupportedBranchFormat().initialize(dir)
        factory = _mod_branch.MetaDirBranchFormatFactory(
            SampleSupportedBranchFormatString,
            "bzrlib.tests.test_branch", "SampleSupportedBranchFormat")
        _mod_branch.format_registry.register(factory)
        self.addCleanup(_mod_branch.format_registry.remove, factory)
        b = _mod_branch.Branch.open(self.get_url())
        self.assertEqual(b, "opened supported branch.")

    def test_from_string(self):
        self.assertIsInstance(
            SampleBranchFormat.from_string("Sample branch format."),
            SampleBranchFormat)
        self.assertRaises(AssertionError,
            SampleBranchFormat.from_string, "Different branch format.")

    def test_find_format_not_branch(self):
        dir = bzrdir.BzrDirMetaFormat1().initialize(self.get_url())
        self.assertRaises(errors.NotBranchError,
                          _mod_branch.BranchFormatMetadir.find_format,
                          dir)

    def test_find_format_unknown_format(self):
        dir = bzrdir.BzrDirMetaFormat1().initialize(self.get_url())
        SampleBranchFormat().initialize(dir)
        self.assertRaises(errors.UnknownFormatError,
                          _mod_branch.BranchFormatMetadir.find_format,
                          dir)

    def test_find_format_with_features(self):
        tree = self.make_branch_and_tree('.', format='2a')
        tree.branch.update_feature_flags({"name": "optional"})
        found_format = _mod_branch.BranchFormatMetadir.find_format(tree.bzrdir)
        self.assertIsInstance(found_format, _mod_branch.BranchFormatMetadir)
        self.assertEquals(found_format.features.get("name"), "optional")
        tree.branch.update_feature_flags({"name": None})
        branch = _mod_branch.Branch.open('.')
        self.assertEquals(branch._format.features, {})


class TestBranchFormatRegistry(tests.TestCase):

    def setUp(self):
        super(TestBranchFormatRegistry, self).setUp()
        self.registry = _mod_branch.BranchFormatRegistry()

    def test_default(self):
        self.assertIs(None, self.registry.get_default())
        format = SampleBranchFormat()
        self.registry.set_default(format)
        self.assertEquals(format, self.registry.get_default())

    def test_register_unregister_format(self):
        format = SampleBranchFormat()
        self.registry.register(format)
        self.assertEquals(format,
            self.registry.get("Sample branch format."))
        self.registry.remove(format)
        self.assertRaises(KeyError, self.registry.get,
            "Sample branch format.")

    def test_get_all(self):
        format = SampleBranchFormat()
        self.assertEquals([], self.registry._get_all())
        self.registry.register(format)
        self.assertEquals([format], self.registry._get_all())

    def test_register_extra(self):
        format = SampleExtraBranchFormat()
        self.assertEquals([], self.registry._get_all())
        self.registry.register_extra(format)
        self.assertEquals([format], self.registry._get_all())

    def test_register_extra_lazy(self):
        self.assertEquals([], self.registry._get_all())
        self.registry.register_extra_lazy("bzrlib.tests.test_branch",
            "SampleExtraBranchFormat")
        formats = self.registry._get_all()
        self.assertEquals(1, len(formats))
        self.assertIsInstance(formats[0], SampleExtraBranchFormat)


#Used by TestMetaDirBranchFormatFactory 
FakeLazyFormat = None


class TestMetaDirBranchFormatFactory(tests.TestCase):

    def test_get_format_string_does_not_load(self):
        """Formats have a static format string."""
        factory = _mod_branch.MetaDirBranchFormatFactory("yo", None, None)
        self.assertEqual("yo", factory.get_format_string())

    def test_call_loads(self):
        # __call__ is used by the network_format_registry interface to get a
        # Format.
        global FakeLazyFormat
        del FakeLazyFormat
        factory = _mod_branch.MetaDirBranchFormatFactory(None,
            "bzrlib.tests.test_branch", "FakeLazyFormat")
        self.assertRaises(AttributeError, factory)

    def test_call_returns_call_of_referenced_object(self):
        global FakeLazyFormat
        FakeLazyFormat = lambda:'called'
        factory = _mod_branch.MetaDirBranchFormatFactory(None,
            "bzrlib.tests.test_branch", "FakeLazyFormat")
        self.assertEqual('called', factory())


class TestBranch67(object):
    """Common tests for both branch 6 and 7 which are mostly the same."""

    def get_format_name(self):
        raise NotImplementedError(self.get_format_name)

    def get_format_name_subtree(self):
        raise NotImplementedError(self.get_format_name)

    def get_class(self):
        raise NotImplementedError(self.get_class)

    def test_creation(self):
        format = bzrdir.BzrDirMetaFormat1()
        format.set_branch_format(_mod_branch.BzrBranchFormat6())
        branch = self.make_branch('a', format=format)
        self.assertIsInstance(branch, self.get_class())
        branch = self.make_branch('b', format=self.get_format_name())
        self.assertIsInstance(branch, self.get_class())
        branch = _mod_branch.Branch.open('a')
        self.assertIsInstance(branch, self.get_class())

    def test_layout(self):
        branch = self.make_branch('a', format=self.get_format_name())
        self.assertPathExists('a/.bzr/branch/last-revision')
        self.assertPathDoesNotExist('a/.bzr/branch/revision-history')
        self.assertPathDoesNotExist('a/.bzr/branch/references')

    def test_config(self):
        """Ensure that all configuration data is stored in the branch"""
        branch = self.make_branch('a', format=self.get_format_name())
        branch.set_parent('http://example.com')
        self.assertPathDoesNotExist('a/.bzr/branch/parent')
        self.assertEqual('http://example.com', branch.get_parent())
        branch.set_push_location('sftp://example.com')
        conf = branch.get_config_stack()
        self.assertEqual('sftp://example.com', conf.get('push_location'))
        branch.set_bound_location('ftp://example.com')
        self.assertPathDoesNotExist('a/.bzr/branch/bound')
        self.assertEqual('ftp://example.com', branch.get_bound_location())

    def do_checkout_test(self, lightweight=False):
        tree = self.make_branch_and_tree('source',
            format=self.get_format_name_subtree())
        subtree = self.make_branch_and_tree('source/subtree',
            format=self.get_format_name_subtree())
        subsubtree = self.make_branch_and_tree('source/subtree/subsubtree',
            format=self.get_format_name_subtree())
        self.build_tree(['source/subtree/file',
                         'source/subtree/subsubtree/file'])
        subsubtree.add('file')
        subtree.add('file')
        subtree.add_reference(subsubtree)
        tree.add_reference(subtree)
        tree.commit('a revision')
        subtree.commit('a subtree file')
        subsubtree.commit('a subsubtree file')
        tree.branch.create_checkout('target', lightweight=lightweight)
        self.assertPathExists('target')
        self.assertPathExists('target/subtree')
        self.assertPathExists('target/subtree/file')
        self.assertPathExists('target/subtree/subsubtree/file')
        subbranch = _mod_branch.Branch.open('target/subtree/subsubtree')
        if lightweight:
            self.assertEndsWith(subbranch.base, 'source/subtree/subsubtree/')
        else:
            self.assertEndsWith(subbranch.base, 'target/subtree/subsubtree/')

    def test_checkout_with_references(self):
        self.do_checkout_test()

    def test_light_checkout_with_references(self):
        self.do_checkout_test(lightweight=True)


class TestBranch6(TestBranch67, tests.TestCaseWithTransport):

    def get_class(self):
        return _mod_branch.BzrBranch6

    def get_format_name(self):
        return "dirstate-tags"

    def get_format_name_subtree(self):
        return "dirstate-with-subtree"

    def test_set_stacked_on_url_errors(self):
        branch = self.make_branch('a', format=self.get_format_name())
        self.assertRaises(errors.UnstackableBranchFormat,
            branch.set_stacked_on_url, None)

    def test_default_stacked_location(self):
        branch = self.make_branch('a', format=self.get_format_name())
        self.assertRaises(errors.UnstackableBranchFormat, branch.get_stacked_on_url)


class TestBranch7(TestBranch67, tests.TestCaseWithTransport):

    def get_class(self):
        return _mod_branch.BzrBranch7

    def get_format_name(self):
        return "1.9"

    def get_format_name_subtree(self):
        return "development-subtree"

    def test_set_stacked_on_url_unstackable_repo(self):
        repo = self.make_repository('a', format='dirstate-tags')
        control = repo.bzrdir
        branch = _mod_branch.BzrBranchFormat7().initialize(control)
        target = self.make_branch('b')
        self.assertRaises(errors.UnstackableRepositoryFormat,
            branch.set_stacked_on_url, target.base)

    def test_clone_stacked_on_unstackable_repo(self):
        repo = self.make_repository('a', format='dirstate-tags')
        control = repo.bzrdir
        branch = _mod_branch.BzrBranchFormat7().initialize(control)
        # Calling clone should not raise UnstackableRepositoryFormat.
        cloned_bzrdir = control.clone('cloned')

    def _test_default_stacked_location(self):
        branch = self.make_branch('a', format=self.get_format_name())
        self.assertRaises(errors.NotStacked, branch.get_stacked_on_url)

    def test_stack_and_unstack(self):
        branch = self.make_branch('a', format=self.get_format_name())
        target = self.make_branch_and_tree('b', format=self.get_format_name())
        branch.set_stacked_on_url(target.branch.base)
        self.assertEqual(target.branch.base, branch.get_stacked_on_url())
        revid = target.commit('foo')
        self.assertTrue(branch.repository.has_revision(revid))
        branch.set_stacked_on_url(None)
        self.assertRaises(errors.NotStacked, branch.get_stacked_on_url)
        self.assertFalse(branch.repository.has_revision(revid))

    def test_open_opens_stacked_reference(self):
        branch = self.make_branch('a', format=self.get_format_name())
        target = self.make_branch_and_tree('b', format=self.get_format_name())
        branch.set_stacked_on_url(target.branch.base)
        branch = branch.bzrdir.open_branch()
        revid = target.commit('foo')
        self.assertTrue(branch.repository.has_revision(revid))


class BzrBranch8(tests.TestCaseWithTransport):

    def make_branch(self, location, format=None):
        if format is None:
            format = controldir.format_registry.make_bzrdir('1.9')
            format.set_branch_format(_mod_branch.BzrBranchFormat8())
        return tests.TestCaseWithTransport.make_branch(
            self, location, format=format)

    def create_branch_with_reference(self):
        branch = self.make_branch('branch')
        branch._set_all_reference_info({'file-id': ('path', 'location')})
        return branch

    @staticmethod
    def instrument_branch(branch, gets):
        old_get = branch._transport.get
        def get(*args, **kwargs):
            gets.append((args, kwargs))
            return old_get(*args, **kwargs)
        branch._transport.get = get

    def test_reference_info_caching_read_locked(self):
        gets = []
        branch = self.create_branch_with_reference()
        branch.lock_read()
        self.addCleanup(branch.unlock)
        self.instrument_branch(branch, gets)
        branch.get_reference_info('file-id')
        branch.get_reference_info('file-id')
        self.assertEqual(1, len(gets))

    def test_reference_info_caching_read_unlocked(self):
        gets = []
        branch = self.create_branch_with_reference()
        self.instrument_branch(branch, gets)
        branch.get_reference_info('file-id')
        branch.get_reference_info('file-id')
        self.assertEqual(2, len(gets))

    def test_reference_info_caching_write_locked(self):
        gets = []
        branch = self.make_branch('branch')
        branch.lock_write()
        self.instrument_branch(branch, gets)
        self.addCleanup(branch.unlock)
        branch._set_all_reference_info({'file-id': ('path2', 'location2')})
        path, location = branch.get_reference_info('file-id')
        self.assertEqual(0, len(gets))
        self.assertEqual('path2', path)
        self.assertEqual('location2', location)

    def test_reference_info_caches_cleared(self):
        branch = self.make_branch('branch')
        branch.lock_write()
        branch.set_reference_info('file-id', 'path2', 'location2')
        branch.unlock()
        doppelganger = _mod_branch.Branch.open('branch')
        doppelganger.set_reference_info('file-id', 'path3', 'location3')
        self.assertEqual(('path3', 'location3'),
                         branch.get_reference_info('file-id'))

    def _recordParentMapCalls(self, repo):
        self._parent_map_calls = []
        orig_get_parent_map = repo.revisions.get_parent_map
        def get_parent_map(q):
            q = list(q)
            self._parent_map_calls.extend([e[0] for e in q])
            return orig_get_parent_map(q)
        repo.revisions.get_parent_map = get_parent_map


class TestBranchReference(tests.TestCaseWithTransport):
    """Tests for the branch reference facility."""

    def test_create_open_reference(self):
        bzrdirformat = bzrdir.BzrDirMetaFormat1()
        t = self.get_transport()
        t.mkdir('repo')
        dir = bzrdirformat.initialize(self.get_url('repo'))
        dir.create_repository()
        target_branch = dir.create_branch()
        t.mkdir('branch')
        branch_dir = bzrdirformat.initialize(self.get_url('branch'))
        made_branch = _mod_branch.BranchReferenceFormat().initialize(
            branch_dir, target_branch=target_branch)
        self.assertEqual(made_branch.base, target_branch.base)
        opened_branch = branch_dir.open_branch()
        self.assertEqual(opened_branch.base, target_branch.base)

    def test_get_reference(self):
        """For a BranchReference, get_reference should return the location."""
        branch = self.make_branch('target')
        checkout = branch.create_checkout('checkout', lightweight=True)
        reference_url = branch.bzrdir.root_transport.abspath('') + '/'
        # if the api for create_checkout changes to return different checkout types
        # then this file read will fail.
        self.assertFileEqual(reference_url, 'checkout/.bzr/branch/location')
        self.assertEqual(reference_url,
            _mod_branch.BranchReferenceFormat().get_reference(checkout.bzrdir))


class TestHooks(tests.TestCaseWithTransport):

    def test_constructor(self):
        """Check that creating a BranchHooks instance has the right defaults."""
        hooks = _mod_branch.BranchHooks()
        self.assertTrue("post_push" in hooks, "post_push not in %s" % hooks)
        self.assertTrue("post_commit" in hooks, "post_commit not in %s" % hooks)
        self.assertTrue("pre_commit" in hooks, "pre_commit not in %s" % hooks)
        self.assertTrue("post_pull" in hooks, "post_pull not in %s" % hooks)
        self.assertTrue("post_uncommit" in hooks,
                        "post_uncommit not in %s" % hooks)
        self.assertTrue("post_change_branch_tip" in hooks,
                        "post_change_branch_tip not in %s" % hooks)
        self.assertTrue("post_branch_init" in hooks,
                        "post_branch_init not in %s" % hooks)
        self.assertTrue("post_switch" in hooks,
                        "post_switch not in %s" % hooks)

    def test_installed_hooks_are_BranchHooks(self):
        """The installed hooks object should be a BranchHooks."""
        # the installed hooks are saved in self._preserved_hooks.
        self.assertIsInstance(self._preserved_hooks[_mod_branch.Branch][1],
                              _mod_branch.BranchHooks)

    def test_post_branch_init_hook(self):
        calls = []
        _mod_branch.Branch.hooks.install_named_hook('post_branch_init',
            calls.append, None)
        self.assertLength(0, calls)
        branch = self.make_branch('a')
        self.assertLength(1, calls)
        params = calls[0]
        self.assertIsInstance(params, _mod_branch.BranchInitHookParams)
        self.assertTrue(hasattr(params, 'bzrdir'))
        self.assertTrue(hasattr(params, 'branch'))

    def test_post_branch_init_hook_repr(self):
        param_reprs = []
        _mod_branch.Branch.hooks.install_named_hook('post_branch_init',
            lambda params: param_reprs.append(repr(params)), None)
        branch = self.make_branch('a')
        self.assertLength(1, param_reprs)
        param_repr = param_reprs[0]
        self.assertStartsWith(param_repr, '<BranchInitHookParams of ')

    def test_post_switch_hook(self):
        from bzrlib import switch
        calls = []
        _mod_branch.Branch.hooks.install_named_hook('post_switch',
            calls.append, None)
        tree = self.make_branch_and_tree('branch-1')
        self.build_tree(['branch-1/file-1'])
        tree.add('file-1')
        tree.commit('rev1')
        to_branch = tree.bzrdir.sprout('branch-2').open_branch()
        self.build_tree(['branch-1/file-2'])
        tree.add('file-2')
        tree.remove('file-1')
        tree.commit('rev2')
        checkout = tree.branch.create_checkout('checkout')
        self.assertLength(0, calls)
        switch.switch(checkout.bzrdir, to_branch)
        self.assertLength(1, calls)
        params = calls[0]
        self.assertIsInstance(params, _mod_branch.SwitchHookParams)
        self.assertTrue(hasattr(params, 'to_branch'))
        self.assertTrue(hasattr(params, 'revision_id'))


class TestBranchOptions(tests.TestCaseWithTransport):

    def setUp(self):
        super(TestBranchOptions, self).setUp()
        self.branch = self.make_branch('.')
        self.config_stack = self.branch.get_config_stack()

    def check_append_revisions_only(self, expected_value, value=None):
        """Set append_revisions_only in config and check its interpretation."""
        if value is not None:
            self.config_stack.set('append_revisions_only', value)
        self.assertEqual(expected_value,
                         self.branch.get_append_revisions_only())

    def test_valid_append_revisions_only(self):
        self.assertEquals(None,
                          self.config_stack.get('append_revisions_only'))
        self.check_append_revisions_only(None)
        self.check_append_revisions_only(False, 'False')
        self.check_append_revisions_only(True, 'True')
        # The following values will cause compatibility problems on projects
        # using older bzr versions (<2.2) but are accepted
        self.check_append_revisions_only(False, 'false')
        self.check_append_revisions_only(True, 'true')

    def test_invalid_append_revisions_only(self):
        """Ensure warning is noted on invalid settings"""
        self.warnings = []
        def warning(*args):
            self.warnings.append(args[0] % args[1:])
        self.overrideAttr(trace, 'warning', warning)
        self.check_append_revisions_only(None, 'not-a-bool')
        self.assertLength(1, self.warnings)
        self.assertEqual(
            'Value "not-a-bool" is not valid for "append_revisions_only"',
            self.warnings[0])

    def test_use_fresh_values(self):
        copy = _mod_branch.Branch.open(self.branch.base)
        copy.lock_write()
        try:
            copy.get_config_stack().set('foo', 'bar')
        finally:
            copy.unlock()
        self.assertFalse(self.branch.is_locked())
        # Since the branch is locked, the option value won't be saved on disk
        # so trying to access the config of locked branch via another older
        # non-locked branch object pointing to the same branch is not supported
        self.assertEqual(None, self.branch.get_config_stack().get('foo'))
        # Using a newly created branch object works as expected
        fresh = _mod_branch.Branch.open(self.branch.base)
        self.assertEqual('bar', fresh.get_config_stack().get('foo'))

    def test_set_from_config_get_from_config_stack(self):
        self.branch.lock_write()
        self.addCleanup(self.branch.unlock)
        self.branch.get_config().set_user_option('foo', 'bar')
        result = self.branch.get_config_stack().get('foo')
        # https://bugs.launchpad.net/bzr/+bug/948344
        self.expectFailure('BranchStack uses cache after set_user_option',
                           self.assertEqual, 'bar', result)

    def test_set_from_config_stack_get_from_config(self):
        self.branch.lock_write()
        self.addCleanup(self.branch.unlock)
        self.branch.get_config_stack().set('foo', 'bar')
        # Since the branch is locked, the option value won't be saved on disk
        # so mixing get() and get_user_option() is broken by design.
        self.assertEqual(None,
                         self.branch.get_config().get_user_option('foo'))

    def test_set_delays_write_when_branch_is_locked(self):
        self.branch.lock_write()
        self.addCleanup(self.branch.unlock)
        self.branch.get_config_stack().set('foo', 'bar')
        copy = _mod_branch.Branch.open(self.branch.base)
        result = copy.get_config_stack().get('foo')
        # Accessing from a different branch object is like accessing from a
        # different process: the option has not been saved yet and the new
        # value cannot be seen.
        self.assertIs(None, result)


class TestPullResult(tests.TestCase):

    def test_report_changed(self):
        r = _mod_branch.PullResult()
        r.old_revid = "old-revid"
        r.old_revno = 10
        r.new_revid = "new-revid"
        r.new_revno = 20
        f = StringIO()
        r.report(f)
        self.assertEqual("Now on revision 20.\n", f.getvalue())
        self.assertEqual("Now on revision 20.\n", f.getvalue())

    def test_report_unchanged(self):
        r = _mod_branch.PullResult()
        r.old_revid = "same-revid"
        r.new_revid = "same-revid"
        f = StringIO()
        r.report(f)
        self.assertEqual("No revisions or tags to pull.\n", f.getvalue())
