# Copyright 2014  Lars Wirzenius
#
# 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 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=


import contextlib
import errno
import StringIO
import unittest

import distixlib


class MetadataLoaderTests(unittest.TestCase):

    def test_raises_specific_error_when_open_fails(self):

        def raise_ioerror(*args):
            raise IOError((errno.ENOENT, 'no existy', 'foobar'))

        loader = distixlib.MetadataLoader()
        loader._open_file = raise_ioerror
        self.assertRaises(
            distixlib.CannotLoadMetadataError,
            loader.load_from_file,
            'this does not need to exist')

    def test_loads_from_file(self):

        def return_text(*args):
            return contextlib.closing(StringIO.StringIO('key:\n- value\n'))

        loader = distixlib.MetadataLoader()
        loader._open_file = return_text
        metadata = loader.load_from_file('foo')
        self.assertListEqual(metadata.keys(), ['key'])
        self.assertListEqual(metadata.get_all_values('key'), ['value'])