# Copyright (C) 2008 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 get_parent_map API."""

from bzrlib import revision
from bzrlib.tests.per_repository import TestCaseWithRepository


class TestGetParentMap(TestCaseWithRepository):

    def test_missing_revision(self):
        tree = self.make_branch_and_tree('.')
        repo = tree.branch.repository
        repo.lock_read()
        self.addCleanup(repo.unlock)
        self.assertEqual({}, repo.get_parent_map(['non-existant']))

    def test_multiple_parents(self):
        tree = self.make_branch_and_tree('.')
        rev1 = tree.commit('first')
        rev2 = tree.commit('second')
        tree.set_parent_ids([rev1, rev2])
        tree.branch.set_last_revision_info(1, rev1)
        rev3 = tree.commit('third')
        repo = tree.branch.repository
        repo.lock_read()
        self.addCleanup(repo.unlock)
        self.assertEqual({rev3:(rev1, rev2)},
                         repo.get_parent_map([rev3]))
        self.assertEqual({rev1:(revision.NULL_REVISION,),
                          rev2:(rev1,),
                          rev3:(rev1, rev2),
                         }, repo.get_parent_map([rev1, rev2, rev3]))

    def test_no_parents(self):
        tree = self.make_branch_and_tree('.')
        rev1 = tree.commit('first')
        repo = tree.branch.repository
        repo.lock_read()
        self.addCleanup(repo.unlock)
        self.assertEqual({rev1:(revision.NULL_REVISION,)},
                         repo.get_parent_map([rev1]))

    def test_none(self):
        tree = self.make_branch_and_tree('.')
        rev1 = tree.commit('first')
        repo = tree.branch.repository
        repo.lock_read()
        self.addCleanup(repo.unlock)
        self.assertRaises(ValueError,
                          repo.get_parent_map, [None])

    def test_null_revision(self):
        tree = self.make_branch_and_tree('.')
        repo = tree.branch.repository
        repo.lock_read()
        self.addCleanup(repo.unlock)
        self.assertEqual({revision.NULL_REVISION:()},
                         repo.get_parent_map([revision.NULL_REVISION]))
