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