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# 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/.
import sys
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');
with MockedOpen({'file1': 'content1',
'file2': 'content2'}):
# 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.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')
# Opening a non-existing file ought to fail.
self.assertRaises(IOError, open, 'file3', 'r')
# 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')
# 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()
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