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Editing: pytest_fixture_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.
import pathlib
import sys

# Example for a test using a custom pytest fixture with an argument to Patcher

import pytest

import pyfakefs.pytest_tests.example as example
from pyfakefs.fake_filesystem_unittest import Patcher
from pyfakefs.pytest_tests import unhashable

@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 test_unhashable(fs):
    # regression test for #923
    print(unhashable)

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()

pytest_parent_path = pathlib.Path(pytest.__file__).parent.parent

@pytest.mark.skipif(
    sys.version_info < (3, 8), reason="importlib.metadata not available"
)
def test_add_package_metadata(fs):
    pytest_dist_path = pytest_parent_path / f"pytest-{pytest.__version__}.dist-info"
    assert not fs.exists(pytest_dist_path)
    fs.add_package_metadata("pytest")
    assert fs.exists(pytest_dist_path)
    assert fs.exists(pytest_dist_path / "METADATA")

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