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[EDIT] FILE: dynamic_patch_test.py

# 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 for patching modules loaded after `setUpPyfakefs()`.
"""

import pathlib
import unittest

from pyfakefs import fake_filesystem_unittest

class TestPyfakefsUnittestBase(fake_filesystem_unittest.TestCase):
    def setUp(self):
        """Set up the fake file system"""
        self.setUpPyfakefs()

class DynamicImportPatchTest(TestPyfakefsUnittestBase):
    def __init__(self, methodName="runTest"):
        super().__init__(methodName)

def test_os_patch(self):
        import os

os.mkdir("test")
        self.assertTrue(self.fs.exists("test"))
        self.assertTrue(os.path.exists("test"))

def test_os_import_as_patch(self):
        import os as _os

_os.mkdir("test")
        self.assertTrue(self.fs.exists("test"))
        self.assertTrue(_os.path.exists("test"))

def test_os_path_patch(self):
        import os.path

os.mkdir("test")
        self.assertTrue(self.fs.exists("test"))
        self.assertTrue(os.path.exists("test"))

def test_shutil_patch(self):
        import shutil

self.fs.set_disk_usage(100)
        self.assertEqual(100, shutil.disk_usage("/").total)

def test_pathlib_path_patch(self):
        file_path = "test.txt"
        path = pathlib.Path(file_path)
        with path.open("w", encoding="utf8") as f:
            f.write("test")

self.assertTrue(self.fs.exists(file_path))
        file_object = self.fs.get_object(file_path)
        self.assertEqual("test", file_object.contents)

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

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