~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006 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 branch implementations - tests a branch format."""

import os
import sys

from bzrlib import (
    branch,
    bzrdir,
    errors,
    gpg,
    urlutils,
    transactions,
    repository,
    )
from bzrlib.branch import Branch, needs_read_lock, needs_write_lock
from bzrlib.delta import TreeDelta
from bzrlib.errors import (FileExists,
                           NoSuchRevision,
                           NoSuchFile,
                           UninitializableFormat,
                           NotBranchError,
                           )
from bzrlib.osutils import getcwd
import bzrlib.revision
from bzrlib.tests import TestCase, TestCaseWithTransport, TestSkipped
from bzrlib.tests.bzrdir_implementations.test_bzrdir import TestCaseWithBzrDir
from bzrlib.tests.HttpServer import HttpServer
from bzrlib.trace import mutter
from bzrlib.transport import get_transport
from bzrlib.transport.memory import MemoryServer
from bzrlib.upgrade import upgrade
from bzrlib.workingtree import WorkingTree


# TODO: Make a branch using basis branch, and check that it 
# doesn't request any files that could have been avoided, by 
# hooking into the Transport.


class TestCaseWithBranch(TestCaseWithBzrDir):

    def setUp(self):
        super(TestCaseWithBranch, self).setUp()
        self.branch = None

    def get_branch(self):
        if self.branch is None:
            self.branch = self.make_branch('')
        return self.branch

    def make_branch(self, relpath, format=None):
        repo = self.make_repository(relpath, format=format)
        # fixme RBC 20060210 this isnt necessarily a fixable thing,
        # Skipped is the wrong exception to raise.
        try:
            return self.branch_format.initialize(repo.bzrdir)
        except errors.UninitializableFormat:
            raise TestSkipped('Uninitializable branch format')

    def make_repository(self, relpath, shared=False, format=None):
        made_control = self.make_bzrdir(relpath, format=format)
        return made_control.create_repository(shared=shared)


class TestBranch(TestCaseWithBranch):

    def test_append_revisions(self):
        """Test appending more than one revision"""
        wt = self.make_branch_and_tree('tree')
        wt.commit('f', rev_id='rev1')
        wt.commit('f', rev_id='rev2')
        wt.commit('f', rev_id='rev3')

        br = self.get_branch()
        br.fetch(wt.branch)
        br.append_revision("rev1")
        self.assertEquals(br.revision_history(), ["rev1",])
        br.append_revision("rev2", "rev3")
        self.assertEquals(br.revision_history(), ["rev1", "rev2", "rev3"])
        self.assertRaises(errors.ReservedId, br.append_revision, 'current:')

    def test_revision_ids_are_utf8(self):
        wt = self.make_branch_and_tree('tree')
        wt.commit('f', rev_id='rev1')
        wt.commit('f', rev_id='rev2')
        wt.commit('f', rev_id='rev3')

        br = self.get_branch()
        br.fetch(wt.branch)
        br.set_revision_history(['rev1', 'rev2', 'rev3'])
        rh = br.revision_history()
        self.assertEqual(['rev1', 'rev2', 'rev3'], rh)
        for revision_id in rh:
            self.assertIsInstance(revision_id, str)
        last = br.last_revision()
        self.assertEqual('rev3', last)
        self.assertIsInstance(last, str)
        revno, last = br.last_revision_info()
        self.assertEqual(3, revno)
        self.assertEqual('rev3', last)
        self.assertIsInstance(last, str)

    def test_fetch_revisions(self):
        """Test fetch-revision operation."""
        get_transport(self.get_url()).mkdir('b1')
        get_transport(self.get_url()).mkdir('b2')
        wt = self.make_branch_and_tree('b1')
        b1 = wt.branch
        b2 = self.make_branch('b2')
        file('b1/foo', 'w').write('hello')
        wt.add(['foo'], ['foo-id'])
        wt.commit('lala!', rev_id='revision-1', allow_pointless=False)

        mutter('start fetch')
        self.assertEqual((1, []), b2.fetch(b1))

        rev = b2.repository.get_revision('revision-1')
        tree = b2.repository.revision_tree('revision-1')
        self.assertEqual(tree.get_file_text('foo-id'), 'hello')

    def test_get_revision_delta(self):
        tree_a = self.make_branch_and_tree('a')
        self.build_tree(['a/foo'])
        tree_a.add('foo', 'file1')
        tree_a.commit('rev1', rev_id='rev1')
        self.build_tree(['a/vla'])
        tree_a.add('vla', 'file2')
        tree_a.commit('rev2', rev_id='rev2')

        delta = tree_a.branch.get_revision_delta(1)
        self.assertIsInstance(delta, TreeDelta)
        self.assertEqual([('foo', 'file1', 'file')], delta.added)
        delta = tree_a.branch.get_revision_delta(2)
        self.assertIsInstance(delta, TreeDelta)
        self.assertEqual([('vla', 'file2', 'file')], delta.added)

    def get_unbalanced_tree_pair(self):
        """Return two branches, a and b, with one file in a."""
        get_transport(self.get_url()).mkdir('a')
        tree_a = self.make_branch_and_tree('a')
        file('a/b', 'wb').write('b')
        tree_a.add('b')
        tree_a.commit("silly commit", rev_id='A')

        get_transport(self.get_url()).mkdir('b')
        tree_b = self.make_branch_and_tree('b')
        return tree_a, tree_b

    def get_balanced_branch_pair(self):
        """Returns br_a, br_b as with one commit in a, and b has a's stores."""
        tree_a, tree_b = self.get_unbalanced_tree_pair()
        tree_b.branch.repository.fetch(tree_a.branch.repository)
        return tree_a, tree_b

    def test_clone_branch(self):
        """Copy the stores from one branch to another"""
        tree_a, tree_b = self.get_balanced_branch_pair()
        tree_b.commit("silly commit")
        os.mkdir('c')
        # this fails to test that the history from a was not used.
        dir_c = tree_a.bzrdir.clone('c', basis=tree_b.bzrdir)
        self.assertEqual(tree_a.branch.revision_history(),
                         dir_c.open_branch().revision_history())

    def test_clone_partial(self):
        """Copy only part of the history of a branch."""
        # TODO: RBC 20060208 test with a revision not on revision-history.
        #       what should that behaviour be ? Emailed the list.
        wt_a = self.make_branch_and_tree('a')
        self.build_tree(['a/one'])
        wt_a.add(['one'])
        wt_a.commit('commit one', rev_id='1')
        self.build_tree(['a/two'])
        wt_a.add(['two'])
        wt_a.commit('commit two', rev_id='2')
        repo_b = self.make_repository('b')
        wt_a.bzrdir.open_repository().copy_content_into(repo_b)
        br_b = wt_a.bzrdir.open_branch().clone(repo_b.bzrdir, revision_id='1')
        self.assertEqual('1', br_b.last_revision())

    def test_sprout_partial(self):
        # test sprouting with a prefix of the revision-history.
        # also needs not-on-revision-history behaviour defined.
        wt_a = self.make_branch_and_tree('a')
        self.build_tree(['a/one'])
        wt_a.add(['one'])
        wt_a.commit('commit one', rev_id='1')
        self.build_tree(['a/two'])
        wt_a.add(['two'])
        wt_a.commit('commit two', rev_id='2')
        repo_b = self.make_repository('b')
        wt_a.bzrdir.open_repository().copy_content_into(repo_b)
        br_b = wt_a.bzrdir.open_branch().sprout(repo_b.bzrdir, revision_id='1')
        self.assertEqual('1', br_b.last_revision())

    def get_parented_branch(self):
        wt_a = self.make_branch_and_tree('a')
        self.build_tree(['a/one'])
        wt_a.add(['one'])
        wt_a.commit('commit one', rev_id='1')

        branch_b = wt_a.bzrdir.sprout('b', revision_id='1').open_branch()
        self.assertEqual(wt_a.branch.base, branch_b.get_parent())
        return branch_b

    def test_clone_branch_nickname(self):
        # test the nick name is preserved always
        raise TestSkipped('XXX branch cloning is not yet tested..')

    def test_clone_branch_parent(self):
        # test the parent is preserved always
        branch_b = self.get_parented_branch()
        repo_c = self.make_repository('c')
        branch_b.repository.copy_content_into(repo_c)
        branch_c = branch_b.clone(repo_c.bzrdir)
        self.assertNotEqual(None, branch_c.get_parent())
        self.assertEqual(branch_b.get_parent(), branch_c.get_parent())

        # We can also set a specific parent, and it should be honored
        random_parent = 'http://bazaar-vcs.org/path/to/branch'
        branch_b.set_parent(random_parent)
        repo_d = self.make_repository('d')
        branch_b.repository.copy_content_into(repo_d)
        branch_d = branch_b.clone(repo_d.bzrdir)
        self.assertEqual(random_parent, branch_d.get_parent())

    def test_copy_content_incomplete(self):
        tree = self.make_branch_and_tree('commit_tree')
        self.build_tree(['foo'], transport=tree.bzrdir.root_transport)
        tree.add('foo')
        tree.commit('revision 1', rev_id='1')
        source = self.make_branch_and_tree('source')
        # this gives us an incomplete repository
        tree.bzrdir.open_repository().copy_content_into(
            source.branch.repository)
        tree.commit('revision 2', rev_id='2', allow_pointless=True)
        tree.bzrdir.open_branch().copy_content_into(source.branch)


    def test_sprout_branch_nickname(self):
        # test the nick name is reset always
        raise TestSkipped('XXX branch sprouting is not yet tested..')

    def test_sprout_branch_parent(self):
        source = self.make_branch('source')
        target = source.bzrdir.sprout(self.get_url('target')).open_branch()
        self.assertEqual(source.bzrdir.root_transport.base, target.get_parent())

    def test_submit_branch(self):
        """Submit location can be queried and set"""
        branch = self.make_branch('branch')
        self.assertEqual(branch.get_submit_branch(), None)
        branch.set_submit_branch('sftp://example.com')
        self.assertEqual(branch.get_submit_branch(), 'sftp://example.com')
        branch.set_submit_branch('sftp://example.net')
        self.assertEqual(branch.get_submit_branch(), 'sftp://example.net')
        
    def test_record_initial_ghost(self):
        """Branches should support having ghosts."""
        wt = self.make_branch_and_tree('.')
        wt.set_parent_ids(['non:existent@rev--ision--0--2'],
            allow_leftmost_as_ghost=True)
        rev_id = wt.commit('commit against a ghost first parent.')
        rev = wt.branch.repository.get_revision(rev_id)
        self.assertEqual(rev.parent_ids, ['non:existent@rev--ision--0--2'])
        # parent_sha1s is not populated now, WTF. rbc 20051003
        self.assertEqual(len(rev.parent_sha1s), 0)

    def test_record_two_ghosts(self):
        """Recording with all ghosts works."""
        wt = self.make_branch_and_tree('.')
        wt.set_parent_ids([
                'foo@azkhazan-123123-abcabc',
                'wibble@fofof--20050401--1928390812',
            ],
            allow_leftmost_as_ghost=True)
        rev_id = wt.commit("commit from ghost base with one merge")
        # the revision should have been committed with two parents
        rev = wt.branch.repository.get_revision(rev_id)
        self.assertEqual(['foo@azkhazan-123123-abcabc',
            'wibble@fofof--20050401--1928390812'],
            rev.parent_ids)

    def test_bad_revision(self):
        self.assertRaises(errors.InvalidRevisionId,
                          self.get_branch().repository.get_revision,
                          None)

# TODO 20051003 RBC:
# compare the gpg-to-sign info for a commit with a ghost and 
#     an identical tree without a ghost
# fetch missing should rewrite the TOC of weaves to list newly available parents.
        
    def test_sign_existing_revision(self):
        wt = self.make_branch_and_tree('.')
        branch = wt.branch
        wt.commit("base", allow_pointless=True, rev_id='A')
        from bzrlib.testament import Testament
        strategy = gpg.LoopbackGPGStrategy(None)
        branch.repository.sign_revision('A', strategy)
        self.assertEqual(Testament.from_revision(branch.repository, 
                         'A').as_short_text(),
                         branch.repository.get_signature_text('A'))

    def test_store_signature(self):
        wt = self.make_branch_and_tree('.')
        branch = wt.branch
        branch.repository.store_revision_signature(
            gpg.LoopbackGPGStrategy(None), 'FOO', 'A')
        self.assertRaises(errors.NoSuchRevision,
                          branch.repository.has_signature_for_revision_id,
                          'A')
        wt.commit("base", allow_pointless=True, rev_id='A')
        self.assertEqual('FOO', 
                         branch.repository.get_signature_text('A'))

    def test_branch_keeps_signatures(self):
        wt = self.make_branch_and_tree('source')
        wt.commit('A', allow_pointless=True, rev_id='A')
        wt.branch.repository.sign_revision('A',
            gpg.LoopbackGPGStrategy(None))
        #FIXME: clone should work to urls,
        # wt.clone should work to disks.
        self.build_tree(['target/'])
        d2 = wt.bzrdir.clone('target')
        self.assertEqual(wt.branch.repository.get_signature_text('A'),
                         d2.open_repository().get_signature_text('A'))

    def test_nicks(self):
        """Branch nicknames"""
        t = get_transport(self.get_url())
        t.mkdir('bzr.dev')
        branch = self.make_branch('bzr.dev')
        self.assertEqual(branch.nick, 'bzr.dev')
        t.move('bzr.dev', 'bzr.ab')
        branch = Branch.open(self.get_url('bzr.ab'))
        self.assertEqual(branch.nick, 'bzr.ab')
        branch.nick = "Aaron's branch"
        branch.nick = "Aaron's branch"
        self.failUnless(
            t.has(
                t.relpath(
                    branch.control_files.controlfilename("branch.conf")
                    )
                )
            )
        self.assertEqual(branch.nick, "Aaron's branch")
        t.move('bzr.ab', 'integration')
        branch = Branch.open(self.get_url('integration'))
        self.assertEqual(branch.nick, "Aaron's branch")
        branch.nick = u"\u1234"
        self.assertEqual(branch.nick, u"\u1234")

    def test_create_open_branch_uses_repository(self):
        try:
            repo = self.make_repository('.', shared=True)
        except errors.IncompatibleFormat:
            return
        repo.bzrdir.root_transport.mkdir('child')
        child_dir = self.bzrdir_format.initialize('child')
        try:
            child_branch = self.branch_format.initialize(child_dir)
        except errors.UninitializableFormat:
            # branch references are not default init'able.
            return
        self.assertEqual(repo.bzrdir.root_transport.base,
                         child_branch.repository.bzrdir.root_transport.base)
        child_branch = branch.Branch.open(self.get_url('child'))
        self.assertEqual(repo.bzrdir.root_transport.base,
                         child_branch.repository.bzrdir.root_transport.base)

    def test_format_description(self):
        tree = self.make_branch_and_tree('tree')
        text = tree.branch._format.get_format_description()
        self.failUnless(len(text))

    def test_check_branch_report_results(self):
        """Checking a branch produces results which can be printed"""
        branch = self.make_branch('.')
        result = branch.check()
        # reports results through logging
        result.report_results(verbose=True)
        result.report_results(verbose=False)

    def test_get_commit_builder(self):
        self.assertIsInstance(self.make_branch(".").get_commit_builder([]), 
            repository.CommitBuilder)

    def test_generate_revision_history(self):
        """Create a fake revision history easily."""
        tree = self.make_branch_and_tree('.')
        rev1 = tree.commit('foo')
        orig_history = tree.branch.revision_history()
        rev2 = tree.commit('bar', allow_pointless=True)
        tree.branch.generate_revision_history(rev1)
        self.assertEqual(orig_history, tree.branch.revision_history())

    def test_generate_revision_history_NULL_REVISION(self):
        tree = self.make_branch_and_tree('.')
        rev1 = tree.commit('foo')
        tree.branch.generate_revision_history(bzrlib.revision.NULL_REVISION)
        self.assertEqual([], tree.branch.revision_history())

    def test_create_checkout(self):
        tree_a = self.make_branch_and_tree('a')
        branch_a = tree_a.branch
        checkout_b = branch_a.create_checkout('b')
        self.assertEqual(None, checkout_b.last_revision())
        checkout_b.commit('rev1', rev_id='rev1')
        self.assertEqual('rev1', branch_a.last_revision())
        self.assertNotEqual(checkout_b.branch.base, branch_a.base)

        checkout_c = branch_a.create_checkout('c', lightweight=True)
        self.assertEqual('rev1', checkout_c.last_revision())
        checkout_c.commit('rev2', rev_id='rev2')
        self.assertEqual('rev2', branch_a.last_revision())
        self.assertEqual(checkout_c.branch.base, branch_a.base)

        os.mkdir('d')
        checkout_d = branch_a.create_checkout('d', lightweight=True)
        self.assertEqual('rev2', checkout_d.last_revision())
        os.mkdir('e')
        checkout_e = branch_a.create_checkout('e')
        self.assertEqual('rev2', checkout_e.last_revision())

    def test_create_anonymous_lightweight_checkout(self):
        """A lightweight checkout from a readonly branch should succeed."""
        tree_a = self.make_branch_and_tree('a')
        rev_id = tree_a.commit('put some content in the branch')
        source_branch = bzrlib.branch.Branch.open(
            'readonly+' + tree_a.bzrdir.root_transport.base)
        # sanity check that the test will be valid
        self.assertRaises((errors.LockError, errors.TransportNotPossible),
            source_branch.lock_write)
        checkout = source_branch.create_checkout('c', lightweight=True)
        self.assertEqual(rev_id, checkout.last_revision())

    def test_create_anonymous_heavyweight_checkout(self):
        """A regular checkout from a readonly branch should succeed."""
        tree_a = self.make_branch_and_tree('a')
        rev_id = tree_a.commit('put some content in the branch')
        source_branch = bzrlib.branch.Branch.open(
            'readonly+' + tree_a.bzrdir.root_transport.base)
        # sanity check that the test will be valid
        self.assertRaises((errors.LockError, errors.TransportNotPossible),
            source_branch.lock_write)
        checkout = source_branch.create_checkout('c')
        self.assertEqual(rev_id, checkout.last_revision())


class ChrootedTests(TestCaseWithBranch):
    """A support class that provides readonly urls outside the local namespace.

    This is done by checking if self.transport_server is a MemoryServer. if it
    is then we are chrooted already, if it is not then an HttpServer is used
    for readonly urls.
    """

    def setUp(self):
        super(ChrootedTests, self).setUp()
        if not self.transport_server == MemoryServer:
            self.transport_readonly_server = HttpServer

    def test_open_containing(self):
        self.assertRaises(NotBranchError, Branch.open_containing,
                          self.get_readonly_url(''))
        self.assertRaises(NotBranchError, Branch.open_containing,
                          self.get_readonly_url('g/p/q'))
        branch = self.make_branch('.')
        branch, relpath = Branch.open_containing(self.get_readonly_url(''))
        self.assertEqual('', relpath)
        branch, relpath = Branch.open_containing(self.get_readonly_url('g/p/q'))
        self.assertEqual('g/p/q', relpath)
        

class InstrumentedTransaction(object):

    def finish(self):
        self.calls.append('finish')

    def __init__(self):
        self.calls = []


class TestDecorator(object):

    def __init__(self):
        self._calls = []

    def lock_read(self):
        self._calls.append('lr')

    def lock_write(self):
        self._calls.append('lw')

    def unlock(self):
        self._calls.append('ul')

    @needs_read_lock
    def do_with_read(self):
        return 1

    @needs_read_lock
    def except_with_read(self):
        raise RuntimeError

    @needs_write_lock
    def do_with_write(self):
        return 2

    @needs_write_lock
    def except_with_write(self):
        raise RuntimeError


class TestDecorators(TestCase):

    def test_needs_read_lock(self):
        branch = TestDecorator()
        self.assertEqual(1, branch.do_with_read())
        self.assertEqual(['lr', 'ul'], branch._calls)

    def test_excepts_in_read_lock(self):
        branch = TestDecorator()
        self.assertRaises(RuntimeError, branch.except_with_read)
        self.assertEqual(['lr', 'ul'], branch._calls)

    def test_needs_write_lock(self):
        branch = TestDecorator()
        self.assertEqual(2, branch.do_with_write())
        self.assertEqual(['lw', 'ul'], branch._calls)

    def test_excepts_in_write_lock(self):
        branch = TestDecorator()
        self.assertRaises(RuntimeError, branch.except_with_write)
        self.assertEqual(['lw', 'ul'], branch._calls)


class TestBranchTransaction(TestCaseWithBranch):

    def setUp(self):
        super(TestBranchTransaction, self).setUp()
        self.branch = None
        
    def test_default_get_transaction(self):
        """branch.get_transaction on a new branch should give a PassThrough."""
        self.failUnless(isinstance(self.get_branch().get_transaction(),
                                   transactions.PassThroughTransaction))

    def test__set_new_transaction(self):
        self.get_branch()._set_transaction(transactions.ReadOnlyTransaction())

    def test__set_over_existing_transaction_raises(self):
        self.get_branch()._set_transaction(transactions.ReadOnlyTransaction())
        self.assertRaises(errors.LockError,
                          self.get_branch()._set_transaction,
                          transactions.ReadOnlyTransaction())

    def test_finish_no_transaction_raises(self):
        self.assertRaises(errors.LockError, self.get_branch()._finish_transaction)

    def test_finish_readonly_transaction_works(self):
        self.get_branch()._set_transaction(transactions.ReadOnlyTransaction())
        self.get_branch()._finish_transaction()
        self.assertEqual(None, self.get_branch().control_files._transaction)

    def test_unlock_calls_finish(self):
        self.get_branch().lock_read()
        transaction = InstrumentedTransaction()
        self.get_branch().control_files._transaction = transaction
        self.get_branch().unlock()
        self.assertEqual(['finish'], transaction.calls)

    def test_lock_read_acquires_ro_transaction(self):
        self.get_branch().lock_read()
        self.failUnless(isinstance(self.get_branch().get_transaction(),
                                   transactions.ReadOnlyTransaction))
        self.get_branch().unlock()
        
    def test_lock_write_acquires_write_transaction(self):
        self.get_branch().lock_write()
        # cannot use get_transaction as its magic
        self.failUnless(isinstance(self.get_branch().control_files._transaction,
                                   transactions.WriteTransaction))
        self.get_branch().unlock()


class TestBranchPushLocations(TestCaseWithBranch):

    def test_get_push_location_unset(self):
        self.assertEqual(None, self.get_branch().get_push_location())

    def test_get_push_location_exact(self):
        from bzrlib.config import (locations_config_filename,
                                   ensure_config_dir_exists)
        ensure_config_dir_exists()
        fn = locations_config_filename()
        print >> open(fn, 'wt'), ("[%s]\n"
                                  "push_location=foo" %
                                  self.get_branch().base[:-1])
        self.assertEqual("foo", self.get_branch().get_push_location())

    def test_set_push_location(self):
        branch = self.get_branch()
        branch.set_push_location('foo')
        self.assertEqual('foo', branch.get_push_location())


class TestFormat(TestCaseWithBranch):
    """Tests for the format itself."""

    def test_format_initialize_find_open(self):
        # loopback test to check the current format initializes to itself.
        if not self.branch_format.is_supported():
            # unsupported formats are not loopback testable
            # because the default open will not open them and
            # they may not be initializable.
            return
        # supported formats must be able to init and open
        t = get_transport(self.get_url())
        readonly_t = get_transport(self.get_readonly_url())
        made_branch = self.make_branch('.')
        self.failUnless(isinstance(made_branch, branch.Branch))

        # find it via bzrdir opening:
        opened_control = bzrdir.BzrDir.open(readonly_t.base)
        direct_opened_branch = opened_control.open_branch()
        self.assertEqual(direct_opened_branch.__class__, made_branch.__class__)
        self.assertEqual(opened_control, direct_opened_branch.bzrdir)
        self.failUnless(isinstance(direct_opened_branch._format,
                        self.branch_format.__class__))

        # find it via Branch.open
        opened_branch = branch.Branch.open(readonly_t.base)
        self.failUnless(isinstance(opened_branch, made_branch.__class__))
        self.assertEqual(made_branch._format.__class__,
                         opened_branch._format.__class__)
        # if it has a unique id string, can we probe for it ?
        try:
            self.branch_format.get_format_string()
        except NotImplementedError:
            return
        self.assertEqual(self.branch_format,
                         branch.BranchFormat.find_format(opened_control))


class TestBound(TestCaseWithBranch):

    def test_bind_unbind(self):
        branch = self.make_branch('1')
        branch2 = self.make_branch('2')
        try:
            branch.bind(branch2)
        except errors.UpgradeRequired:
            raise TestSkipped('Format does not support binding')
        self.assertTrue(branch.unbind())
        self.assertFalse(branch.unbind())
        self.assertIs(None, branch.get_bound_location())

    def test_old_bound_location(self):
        branch = self.make_branch('branch1')
        try:
            self.assertIs(None, branch.get_old_bound_location())
        except errors.UpgradeRequired:
            raise TestSkipped('Format does not store old bound locations')
        branch2 = self.make_branch('branch2')
        branch.bind(branch2)
        self.assertIs(None, branch.get_old_bound_location())
        branch.unbind()
        self.assertContainsRe(branch.get_old_bound_location(), '\/branch2\/$')


class TestStrict(TestCaseWithBranch):

    def test_strict_history(self):
        tree1 = self.make_branch_and_tree('tree1')
        try:
            tree1.branch.set_append_revisions_only(True)
        except errors.UpgradeRequired:
            raise TestSkipped('Format does not support strict history')
        tree1.commit('empty commit')
        tree2 = tree1.bzrdir.sprout('tree2').open_workingtree()
        tree2.commit('empty commit 2')
        tree1.pull(tree2.branch)
        tree1.commit('empty commit 3')
        tree2.commit('empty commit 4')
        self.assertRaises(errors.DivergedBranches, tree1.pull, tree2.branch)
        tree2.merge_from_branch(tree1.branch)
        tree2.commit('empty commit 5')
        self.assertRaises(errors.AppendRevisionsOnlyViolation, tree1.pull,
                          tree2.branch)
        tree3 = tree1.bzrdir.sprout('tree3').open_workingtree()
        tree3.merge_from_branch(tree2.branch)
        tree3.commit('empty commit 6')
        tree2.pull(tree3.branch)