)

        self.imc.add(vcs.nodes.FileNode('newfile', content=''))

        self.imc.commit(

            message=u'Back in default branch',

            author=u'joe',

            parents=[tip],

        )

        default_branch_changesets = self.repo.get_changesets(

            branch_name=self.repo.DEFAULT_BRANCH_NAME)

        assert doc_changeset not in default_branch_changesets

    def test_get_changeset_by_branch(self):

        for branch, sha in self.repo.branches.iteritems():

            assert sha == self.repo.get_changeset(branch).raw_id

    def test_get_changeset_by_tag(self):

        for tag, sha in self.repo.tags.iteritems():

            assert sha == self.repo.get_changeset(tag).raw_id

    def test_get_changeset_parents(self):

        for test_rev in [1, 2, 3]:

            sha = self.repo.get_changeset(test_rev-1)

            assert [sha] == self.repo.get_changeset(test_rev).parents

    def test_get_changeset_children(self):

        for test_rev in [1, 2, 3]:

            sha = self.repo.get_changeset(test_rev+1)

            assert [sha] == self.repo.get_changeset(test_rev).children

class _ChangesetsTestCaseMixin(_BackendTestMixin):

    recreate_repo_per_test = False

    @classmethod

    def _get_commits(cls):

        start_date = datetime.datetime(2010, 1, 1, 20)

        for x in xrange(5):

            yield {

                'message': u'Commit %d' % x,

                'author': u'Joe Doe <joe.doe@example.com>',

                'date': start_date + datetime.timedelta(hours=12 * x),

                'added': [

                    FileNode('file_%d.txt' % x, content='Foobar %d' % x),

                ],

            }

    def test_simple(self):

        tip = self.repo.get_changeset()

        assert tip.date == datetime.datetime(2010, 1, 3, 20)

    def test_get_changesets_is_ordered_by_date(self):

        changesets = list(self.repo.get_changesets())

        ordered_by_date = sorted(changesets,

            key=lambda cs: cs.date)

        assert changesets == ordered_by_date

    def test_get_changesets_respects_start(self):

        second_id = self.repo.revisions[1]

        changesets = list(self.repo.get_changesets(start=second_id))

        assert len(changesets) == 4

    def test_get_changesets_numerical_id_respects_start(self):

        second_id = 1

        changesets = list(self.repo.get_changesets(start=second_id))

        assert len(changesets) == 4

    def test_get_changesets_includes_start_changeset(self):

        second_id = self.repo.revisions[1]

        changesets = list(self.repo.get_changesets(start=second_id))

        assert changesets[0].raw_id == second_id

    def test_get_changesets_respects_end(self):

        second_id = self.repo.revisions[1]

        changesets = list(self.repo.get_changesets(end=second_id))

        assert changesets[-1].raw_id == second_id

        assert len(changesets) == 2

    def test_get_changesets_numerical_id_respects_end(self):

        second_id = 1

        changesets = list(self.repo.get_changesets(end=second_id))

        assert changesets.index(changesets[-1]) == second_id

        assert len(changesets) == 2

    def test_get_changesets_respects_both_start_and_end(self):

        second_id = self.repo.revisions[1]

        third_id = self.repo.revisions[2]

        changesets = list(self.repo.get_changesets(start=second_id,

            end=third_id))

        assert len(changesets) == 2

    def test_get_changesets_numerical_id_respects_both_start_and_end(self):

        changesets = list(self.repo.get_changesets(start=2, end=3))

        assert len(changesets) == 2

    def test_get_changesets_on_empty_repo_raises_EmptyRepository_error(self):

        with pytest.raises(EmptyRepositoryError):

            list(repo.get_changesets(start='foobar'))

    def test_get_changesets_includes_end_changeset(self):

        second_id = self.repo.revisions[1]

        changesets = list(self.repo.get_changesets(end=second_id))

        assert changesets[-1].raw_id == second_id

    def test_get_changesets_respects_start_date(self):

        start_date = datetime.datetime(2010, 2, 1)

        for cs in self.repo.get_changesets(start_date=start_date):

            assert cs.date >= start_date

    def test_get_changesets_respects_end_date(self):

        start_date = datetime.datetime(2010, 1, 1)

        end_date = datetime.datetime(2010, 2, 1)

        for cs in self.repo.get_changesets(start_date=start_date,

                                           end_date=end_date):

            assert cs.date >= start_date

            assert cs.date <= end_date

    def test_get_changesets_respects_start_date_and_end_date(self):

        end_date = datetime.datetime(2010, 2, 1)

        for cs in self.repo.get_changesets(end_date=end_date):

            assert cs.date <= end_date

    def test_get_changesets_respects_reverse(self):

        changesets_id_list = [cs.raw_id for cs in

            self.repo.get_changesets(reverse=True)]

        assert changesets_id_list == list(reversed(self.repo.revisions))

    def test_get_filenodes_generator(self):

        tip = self.repo.get_changeset()

        filepaths = [node.path for node in tip.get_filenodes_generator()]

        assert filepaths == ['file_%d.txt' % x for x in xrange(5)]

    def test_size(self):

        tip = self.repo.get_changeset()

        size = 5 * len('Foobar N') # Size of 5 files

        assert tip.size == size

    def test_author(self):

        tip = self.repo.get_changeset()

        assert tip.author == u'Joe Doe <joe.doe@example.com>'

    def test_author_name(self):

        tip = self.repo.get_changeset()

        assert tip.author_name == u'Joe Doe'

    def test_author_email(self):

        tip = self.repo.get_changeset()

        assert tip.author_email == u'joe.doe@example.com'

    def test_get_changesets_raise_changesetdoesnotexist_for_wrong_start(self):

        with pytest.raises(ChangesetDoesNotExistError):

            list(self.repo.get_changesets(start='foobar'))

    def test_get_changesets_raise_changesetdoesnotexist_for_wrong_end(self):

        with pytest.raises(ChangesetDoesNotExistError):

            list(self.repo.get_changesets(end='foobar'))

    def test_get_changesets_raise_branchdoesnotexist_for_wrong_branch_name(self):

        with pytest.raises(BranchDoesNotExistError):

            list(self.repo.get_changesets(branch_name='foobar'))

    def test_get_changesets_raise_repositoryerror_for_wrong_start_end(self):

        start = self.repo.revisions[-1]

        end = self.repo.revisions[0]

        with pytest.raises(RepositoryError):

            list(self.repo.get_changesets(start=start, end=end))

    def test_get_changesets_numerical_id_reversed(self):

        with pytest.raises(RepositoryError):

            [x for x in self.repo.get_changesets(start=3, end=2)]

    def test_get_changesets_numerical_id_respects_both_start_and_end_last(self):

        with pytest.raises(RepositoryError):

            last = len(self.repo.revisions)

            list(self.repo.get_changesets(start=last-1, end=last-2))

    def test_get_changesets_numerical_id_last_zero_error(self):

        with pytest.raises(RepositoryError):

            last = len(self.repo.revisions)

            list(self.repo.get_changesets(start=last-1, end=0))

class _ChangesetsChangesTestCaseMixin(_BackendTestMixin):

    recreate_repo_per_test = False

    @classmethod

    def _get_commits(cls):

        return [

            {

                'message': u'Initial',

                'author': u'Joe Doe <joe.doe@example.com>',

                'date': datetime.datetime(2010, 1, 1, 20),