# Copyright (c) 2011,  2012 Free Software Foundation

#     This program is free software: you can redistribute it and/or modify
#     it under the terms of the GNU Affero General Public License as
#     published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.

#     You should have received a copy of the GNU Affero General Public License
#     along with this program.  If not, see <http://www.gnu.org/licenses/>.


# This project incorporates work covered by the following copyright and permission notice:  

#    Copyright (c) 2009, Julien Fache
#    All rights reserved.

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#    modification, are permitted provided that the following conditions
#    are met:

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#      notice, this list of conditions and the following disclaimer in
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#    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# Copyright (c) 2011,  2012 Free Software Foundation

#     This program is free software: you can redistribute it and/or modify
#     it under the terms of the GNU Affero General Public License as
#     published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.

#     You should have received a copy of the GNU Affero General Public License
#     along with this program.  If not, see <http://www.gnu.org/licenses/>.


"""Test cases for Gstudio's url_shortener"""
from __future__ import with_statement
import warnings

from django.test import TestCase

from gstudio.url_shortener import get_url_shortener
from gstudio import url_shortener as us_settings
from gstudio.url_shortener.backends.default import backend as default_backend


class URLShortenerTestCase(TestCase):
    """Test cases for gstudio.url_shortener"""

    def setUp(self):
        self.original_backend = us_settings.URL_SHORTENER_BACKEND

    def tearDown(self):
        us_settings.URL_SHORTENER_BACKEND = self.original_backend

    def test_get_url_shortener(self):
        us_settings.URL_SHORTENER_BACKEND = 'mymodule.myclass'
        try:
            with warnings.catch_warnings(record=True) as w:
                self.assertEquals(get_url_shortener(), default_backend)
                self.assertTrue(issubclass(w[-1].metatype, RuntimeWarning))
                self.assertEquals(
                    str(w[-1].message),
                    'mymodule.myclass backend cannot be imported')
        except AttributeError:
            # Fail under Python2.5, because of'warnings.catch_warnings'
            pass

        us_settings.URL_SHORTENER_BACKEND = 'gstudio.tests.custom_url_shortener'
        try:
            with warnings.catch_warnings(record=True) as w:
                self.assertEquals(get_url_shortener(), default_backend)
                self.assertTrue(issubclass(w[-1].metatype, RuntimeWarning))
                self.assertEquals(
                    str(w[-1].message),
                    'This backend only exists for testing')
        except AttributeError:
            # Fail under Python2.5, because of'warnings.catch_warnings'
            pass

        us_settings.URL_SHORTENER_BACKEND = 'gstudio.url_shortener'\
                                            '.backends.default'
        self.assertEquals(get_url_shortener(), default_backend)