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[EDIT] FILE: fake_tempfile_test.py

# Copyright 2009 Google Inc. 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.

"""Tests that ensure that the `tempfile` module works with `fake_filesystem`
if using `Patcher` (via `fake_filesystem_unittest`).
"""

import os
import stat
import tempfile
import unittest

from pyfakefs import fake_filesystem_unittest

class FakeTempfileModuleTest(fake_filesystem_unittest.TestCase):
    """Test the 'tempfile' module with the fake file system."""

def setUp(self):
        self.setUpPyfakefs()

def test_named_temporary_file(self):
        obj = tempfile.NamedTemporaryFile()
        self.assertTrue(self.fs.get_object(obj.name))
        obj.close()
        with self.assertRaises(OSError):
            self.fs.get_object(obj.name)

def test_named_temporary_file_no_delete(self):
        obj = tempfile.NamedTemporaryFile(delete=False)
        obj.write(b"foo")
        obj.close()
        file_obj = self.fs.get_object(obj.name)
        contents = file_obj.contents
        self.assertEqual("foo", contents)
        obj = tempfile.NamedTemporaryFile(mode="w", encoding="utf8", delete=False)
        obj.write("foo")
        obj.close()
        file_obj = self.fs.get_object(obj.name)
        self.assertEqual("foo", file_obj.contents)

def test_mkstemp(self):
        next_fd = len(self.fs.open_files)
        temporary = tempfile.mkstemp()
        self.assertEqual(2, len(temporary))
        self.assertTrue(
            temporary[1].startswith(os.path.join(tempfile.gettempdir(), "tmp"))
        )
        self.assertEqual(next_fd, temporary[0])
        self.assertTrue(self.fs.exists(temporary[1]))
        mode = 0o666 if self.fs.is_windows_fs else 0o600
        self.assertEqual(self.fs.get_object(temporary[1]).st_mode, stat.S_IFREG | mode)
        fh = os.fdopen(temporary[0], "w+b")
        self.assertEqual(temporary[0], fh.fileno())

def test_mkstemp_dir(self):
        """test tempfile.mkstemp(dir=)."""
        # expect fail: /dir does not exist
        with self.assertRaises(OSError):
            tempfile.mkstemp(dir="/dir")
        # expect pass: /dir exists
        self.fs.create_dir("/dir")
        next_fd = len(self.fs.open_files)
        temporary = tempfile.mkstemp(dir="/dir")
        self.assertEqual(2, len(temporary))
        self.assertEqual(next_fd, temporary[0])
        self.assertTrue(
            temporary[1].startswith(os.path.join(self.fs.root_dir_name, "dir", "tmp"))
        )
        self.assertTrue(self.fs.exists(temporary[1]))
        mode = 0o666 if self.fs.is_windows_fs else 0o600
        self.assertEqual(self.fs.get_object(temporary[1]).st_mode, stat.S_IFREG | mode)

def test_mkdtemp(self):
        dirname = tempfile.mkdtemp()
        self.assertTrue(dirname)
        self.assertTrue(self.fs.exists(dirname))
        self.assertEqual(self.fs.get_object(dirname).st_mode, stat.S_IFDIR | 0o700)

def test_temporary_directory(self):
        with tempfile.TemporaryDirectory() as tmpdir:
            self.assertTrue(tmpdir)
            self.assertTrue(self.fs.exists(tmpdir))
            self.assertEqual(self.fs.get_object(tmpdir).st_mode, stat.S_IFDIR | 0o700)

def test_temporary_file(self):
        with tempfile.TemporaryFile() as f:
            f.write(b"test")
            f.seek(0)
            self.assertEqual(b"test", f.read())

def test_temporay_file_with_dir(self):
        with self.assertRaises(FileNotFoundError):
            tempfile.TemporaryFile(dir="/parent")
        os.mkdir("/parent")
        with tempfile.TemporaryFile() as f:
            f.write(b"test")
            f.seek(0)
            self.assertEqual(b"test", f.read())

if __name__ == "__main__":
    unittest.main()

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