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# 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.
# Example for a test using a custom pytest fixture with an argument to Patcher
# Needs Python >= 3.6
import pytest
import pyfakefs.pytest_tests.example as example
from pyfakefs.fake_filesystem_unittest import Patcher
@pytest.mark.xfail
def test_example_file_failing(fs):
"""Test fails because EXAMPLE_FILE is cached in the module
and not patched."""
fs.create_file(example.EXAMPLE_FILE, contents="stuff here")
check_that_example_file_is_in_fake_fs()
def test_example_file_passing_using_fixture(fs_reload_example):
"""Test passes if using a fixture that reloads the module containing
EXAMPLE_FILE"""
fs_reload_example.create_file(example.EXAMPLE_FILE, contents="stuff here")
check_that_example_file_is_in_fake_fs()
def test_example_file_passing_using_patcher():
"""Test passes if using a Patcher instance that reloads the module
containing EXAMPLE_FILE"""
with Patcher(modules_to_reload=[example]) as patcher:
patcher.fs.create_file(example.EXAMPLE_FILE, contents="stuff here")
check_that_example_file_is_in_fake_fs()
def check_that_example_file_is_in_fake_fs():
with open(example.EXAMPLE_FILE) as file:
assert file.read() == "stuff here"
with example.EXAMPLE_FILE.open() as file:
assert file.read() == "stuff here"
assert example.EXAMPLE_FILE.read_text() == "stuff here"
assert example.EXAMPLE_FILE.is_file()