How to use the poetry.utils.env.NullEnv function in poetry

def test_dist_info_file_permissions():
    module_path = fixtures_dir / "complete"
    WheelBuilder.make(Factory().create_poetry(module_path), NullEnv(), NullIO())

    whl = module_path / "dist" / "my_package-1.2.3-py3-none-any.whl"

    with zipfile.ZipFile(str(whl)) as z:
        assert (
            z.getinfo("my_package-1.2.3.dist-info/WHEEL").external_attr == 0o644 << 16
        )
        assert (
            z.getinfo("my_package-1.2.3.dist-info/METADATA").external_attr
            == 0o644 << 16
        )
        assert (
            z.getinfo("my_package-1.2.3.dist-info/RECORD").external_attr == 0o644 << 16
        )
        assert (
            z.getinfo("my_package-1.2.3.dist-info/entry_points.txt").external_attr

def test_proper_python_requires_if_three_digits_precision_version_specified():
    poetry = Factory().create_poetry(project("single_python"))

    builder = SdistBuilder(poetry, NullEnv(), NullIO())
    pkg_info = builder.build_pkg_info()
    p = Parser()
    parsed = p.parsestr(to_str(pkg_info))

    assert parsed["Requires-Python"] == "==2.7.15"

def test_wheel_package_src():
    module_path = fixtures_dir / "source_package"
    WheelBuilder.make(Factory().create_poetry(module_path), NullEnv(), NullIO())

    whl = module_path / "dist" / "package_src-0.1-py2.py3-none-any.whl"

    assert whl.exists()

    with zipfile.ZipFile(str(whl)) as z:
        assert "package_src/__init__.py" in z.namelist()
        assert "package_src/module.py" in z.namelist()

def test_make_setup():
    poetry = Factory().create_poetry(project("complete"))

    builder = SdistBuilder(poetry, NullEnv(), NullIO())
    setup = builder.build_setup()
    setup_ast = ast.parse(setup)

    setup_ast.body = [n for n in setup_ast.body if isinstance(n, ast.Assign)]
    ns = {}
    exec(compile(setup_ast, filename="setup.py", mode="exec"), ns)
    assert ns["packages"] == [
        "my_package",
        "my_package.sub_pkg1",
        "my_package.sub_pkg2",
    ]
    assert ns["install_requires"] == ["cachy[msgpack]>=0.2.0,<0.3.0", "cleo>=0.6,<0.7"]
    assert ns["entry_points"] == {
        "console_scripts": [
            "extra-script = my_package.extra:main[time]",
            "my-2nd-script = my_package:main2",

def test_wheel_c_extension_src_layout():
    module_path = fixtures_dir / "src_extended"
    builder = CompleteBuilder(
        Factory().create_poetry(module_path), NullEnv(execute=True), NullIO()
    )
    builder.build()

    sdist = fixtures_dir / "src_extended" / "dist" / "extended-0.1.tar.gz"

    assert sdist.exists()

    with tarfile.open(str(sdist), "r") as tar:
        assert "extended-0.1/build.py" in tar.getnames()
        assert "extended-0.1/src/extended/extended.c" in tar.getnames()

    whl = list((module_path / "dist").glob("extended-0.1-cp*-cp*-*.whl"))[0]

    assert whl.exists()

    zip = zipfile.ZipFile(str(whl))

def test_with_src_module_file():
    poetry = Factory().create_poetry(project("source_file"))

    builder = SdistBuilder(poetry, NullEnv(), NullIO())

    # Check setup.py
    setup = builder.build_setup()
    setup_ast = ast.parse(setup)

    setup_ast.body = [n for n in setup_ast.body if isinstance(n, ast.Assign)]
    ns = {}
    exec(compile(setup_ast, filename="setup.py", mode="exec"), ns)
    assert ns["package_dir"] == {"": "src"}
    assert ns["modules"] == ["module_src"]

    builder.build()

    sdist = fixtures_dir / "source_file" / "dist" / "module-src-0.1.tar.gz"

    assert sdist.exists()

def test_with_src_module_dir():
    poetry = Factory().create_poetry(project("source_package"))

    builder = SdistBuilder(poetry, NullEnv(), NullIO())

    # Check setup.py
    setup = builder.build_setup()
    setup_ast = ast.parse(setup)

    setup_ast.body = [n for n in setup_ast.body if isinstance(n, ast.Assign)]
    ns = {}
    exec(compile(setup_ast, filename="setup.py", mode="exec"), ns)
    assert ns["package_dir"] == {"": "src"}
    assert ns["packages"] == ["package_src"]

    builder.build()

    sdist = fixtures_dir / "source_package" / "dist" / "package-src-0.1.tar.gz"

    assert sdist.exists()

"tool" in pyproject_content and "poetry" in pyproject_content["tool"]
            )
            # Even if there is a build system specified
            # pip as of right now does not support it fully
            # TODO: Check for pip version when proper PEP-517 support lands
            # has_build_system = ("build-system" in pyproject_content)

        setup = os.path.join(req, "setup.py")
        has_setup = os.path.exists(setup)
        if not has_setup and has_poetry and (package.develop or not has_build_system):
            # We actually need to rely on creating a temporary setup.py
            # file since pip, as of this comment, does not support
            # build-system for editable packages
            # We also need it for non-PEP-517 packages
            builder = SdistBuilder(
                Factory().create_poetry(pyproject.parent), NullEnv(), NullIO()
            )

            with open(setup, "w", encoding="utf-8") as f:
                f.write(decode(builder.build_setup()))

        if package.develop:
            args.append("-e")

        args.append(req)

        try:
            return self.run(*args)
        finally:
            if not has_setup and os.path.exists(setup):
                os.remove(setup)

def __init__(self, path=None, base=None, execute=False):
        if path is None:
            path = Path(sys.prefix)

        super(NullEnv, self).__init__(path, base=base)

        self._execute = execute
        self.executed = []