python-glanceclient/tests/test_utils.py

# Copyright 2012 OpenStack Foundation
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import sys

import six
import testtools

from glanceclient.common import utils


class TestUtils(testtools.TestCase):

    def test_make_size_human_readable(self):
        self.assertEqual("106B", utils.make_size_human_readable(106))
        self.assertEqual("1000kB", utils.make_size_human_readable(1024000))
        self.assertEqual("1MB", utils.make_size_human_readable(1048576))
        self.assertEqual("1.4GB", utils.make_size_human_readable(1476395008))
        self.assertEqual("9.3MB", utils.make_size_human_readable(9761280))

    def test_get_new_file_size(self):
        size = 98304
        file_obj = six.StringIO('X' * size)
        try:
            self.assertEqual(utils.get_file_size(file_obj), size)
            # Check that get_file_size didn't change original file position.
            self.assertEqual(file_obj.tell(), 0)
        finally:
            file_obj.close()

    def test_get_consumed_file_size(self):
        size, consumed = 98304, 304
        file_obj = six.StringIO('X' * size)
        file_obj.seek(consumed)
        try:
            self.assertEqual(utils.get_file_size(file_obj), size)
            # Check that get_file_size didn't change original file position.
            self.assertEqual(file_obj.tell(), consumed)
        finally:
            file_obj.close()

    def test_prettytable(self):
        class Struct:
            def __init__(self, **entries):
                self.__dict__.update(entries)

        # test that the prettytable output is wellformatted (left-aligned)
        columns = ['ID', 'Name']
        val = ['Name1', 'another', 'veeeery long']
        images = [Struct(**{'id': i ** 16, 'name': val[i]})
                  for i in range(len(val))]

        saved_stdout = sys.stdout
        try:
            sys.stdout = output_list = six.StringIO()
            utils.print_list(images, columns)

            sys.stdout = output_dict = six.StringIO()
            utils.print_dict({'K': 'k', 'Key': 'veeeeeeeeeeeeeeeeeeeeeeee'
                              'eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee'
                              'eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee'
                              'eeeeeeeeeeeery long value'},
                             max_column_width=60)

        finally:
            sys.stdout = saved_stdout

        self.assertEqual(output_list.getvalue(), '''\
+-------+--------------+
| ID    | Name         |
+-------+--------------+
|       | Name1        |
| 1     | another      |
| 65536 | veeeery long |
+-------+--------------+
''')

        self.assertEqual(output_dict.getvalue(), '''\
+----------+--------------------------------------------------------------+
| Property | Value                                                        |
+----------+--------------------------------------------------------------+
| K        | k                                                            |
| Key      | veeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee |
|          | eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee |
|          | ery long value                                               |
+----------+--------------------------------------------------------------+
''')

    def test_exception_to_str(self):
        class FakeException(Exception):
            def __str__(self):
                raise UnicodeError()

        ret = utils.exception_to_str(Exception('error message'))
        self.assertEqual(ret, 'error message')

        ret = utils.exception_to_str(Exception('\xa5 error message'))
        self.assertEqual(ret, ' error message')

        ret = utils.exception_to_str(FakeException('\xa5 error message'))
        self.assertEqual(ret, "Caught '%(exception)s' exception." %
                         {'exception': 'FakeException'})