# Copyright (C) 2010 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 bzrlib.pyutils."""

from bzrlib import (
    branch,
    tests,
    )
from bzrlib.pyutils import (
    calc_parent_name,
    get_named_object,
    )


class TestGetNamedObject(tests.TestCase):
    """Tests for get_named_object."""

    def test_module_only(self):
        import sys
        self.assertIs(sys, get_named_object('sys'))

    def test_dotted_module(self):
        self.assertIs(branch, get_named_object('bzrlib.branch'))

    def test_module_attr(self):
        self.assertIs(
            branch.Branch, get_named_object('bzrlib.branch', 'Branch'))

    def test_dotted_attr(self):
        self.assertIs(
            branch.Branch.hooks,
            get_named_object('bzrlib.branch', 'Branch.hooks'))

    def test_package(self):
        # bzrlib.tests is a package, not simply a module
        self.assertIs(tests, get_named_object('bzrlib.tests'))

    def test_package_attr(self):
        # bzrlib.tests is a package, not simply a module
        self.assertIs(
            tests.TestCase, get_named_object('bzrlib.tests', 'TestCase'))

    def test_import_error(self):
        self.assertRaises(ImportError, get_named_object, 'NO_SUCH_MODULE')

    def test_attribute_error(self):
        self.assertRaises(
            AttributeError, get_named_object, 'sys', 'NO_SUCH_ATTR')



class TestCalcParent_name(tests.TestCase):
    """Tests for calc_parent_name."""

    def test_dotted_member(self):
        self.assertEqual(
            ('mod_name', 'attr1', 'attr2'),
            calc_parent_name('mod_name', 'attr1.attr2'))

    def test_undotted_member(self):
        self.assertEqual(
            ('mod_name', None, 'attr1'),
            calc_parent_name('mod_name', 'attr1'))

    def test_dotted_module_no_member(self):
        self.assertEqual(
            ('mod', None, 'sub_mod'),
            calc_parent_name('mod.sub_mod'))

    def test_undotted_module_no_member(self):
        err = self.assertRaises(AssertionError, calc_parent_name, 'mod_name')
        self.assertEqual(
            "No parent object for top-level module 'mod_name'", err.args[0])