gecko-dev/config/tests/unit-mozunit.py
Justin Wood baa089903e Bug 1559975 - Make config/ lint with 'py2' and 'py3' r=catlee
Depends on D36091

Differential Revision: https://phabricator.services.mozilla.com/D36092

--HG--
extra : moz-landing-system : lando
2019-07-08 17:30:34 +00:00

89 lines
3.3 KiB
Python

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
from __future__ import absolute_import
import os
from mozunit import main, MockedOpen
import unittest
from tempfile import mkstemp
class TestMozUnit(unittest.TestCase):
def test_mocked_open(self):
# Create a temporary file on the file system.
(fd, path) = mkstemp()
with os.fdopen(fd, 'w') as file:
file.write('foobar')
self.assertFalse(os.path.exists('file1'))
self.assertFalse(os.path.exists('file2'))
with MockedOpen({'file1': 'content1',
'file2': 'content2'}):
self.assertTrue(os.path.exists('file1'))
self.assertTrue(os.path.exists('file2'))
self.assertFalse(os.path.exists('foo/file1'))
# Check the contents of the files given at MockedOpen creation.
self.assertEqual(open('file1', 'r').read(), 'content1')
self.assertEqual(open('file2', 'r').read(), 'content2')
# Check that overwriting these files alters their content.
with open('file1', 'w') as file:
file.write('foo')
self.assertTrue(os.path.exists('file1'))
self.assertEqual(open('file1', 'r').read(), 'foo')
# ... but not until the file is closed.
file = open('file2', 'w')
file.write('bar')
self.assertEqual(open('file2', 'r').read(), 'content2')
file.close()
self.assertEqual(open('file2', 'r').read(), 'bar')
# Check that appending to a file does append
with open('file1', 'a') as file:
file.write('bar')
self.assertEqual(open('file1', 'r').read(), 'foobar')
self.assertFalse(os.path.exists('file3'))
# Opening a non-existing file ought to fail.
self.assertRaises(IOError, open, 'file3', 'r')
self.assertFalse(os.path.exists('file3'))
# Check that writing a new file does create the file.
with open('file3', 'w') as file:
file.write('baz')
self.assertEqual(open('file3', 'r').read(), 'baz')
self.assertTrue(os.path.exists('file3'))
# Check the content of the file created outside MockedOpen.
self.assertEqual(open(path, 'r').read(), 'foobar')
# Check that overwriting a file existing on the file system
# does modify its content.
with open(path, 'w') as file:
file.write('bazqux')
self.assertEqual(open(path, 'r').read(), 'bazqux')
with MockedOpen():
# Check that appending to a file existing on the file system
# does modify its content.
with open(path, 'a') as file:
file.write('bazqux')
self.assertEqual(open(path, 'r').read(), 'foobarbazqux')
# Check that the file was not actually modified on the file system.
self.assertEqual(open(path, 'r').read(), 'foobar')
os.remove(path)
# Check that the file created inside MockedOpen wasn't actually
# created.
self.assertRaises(IOError, open, 'file3', 'r')
if __name__ == "__main__":
main()