How to use the requirementslib.models.pipfile.Pipfile.load_projectfile function in requirementslib

def test_failures(pathlib_tmpdir):
    with pytest.raises(RuntimeError):
        Pipfile.load_projectfile(None)
    fake_path = Path("my_fake_directory").absolute()
    with pytest.raises(FileNotFoundError):
        Pipfile.load_projectfile(fake_path)
    project_dir = pathlib_tmpdir.joinpath("project")
    project_dir.mkdir()
    with pytest.raises(RequirementError):
        Pipfile.load_projectfile(project_dir, create=False)

def test_failures(pathlib_tmpdir):
    with pytest.raises(RuntimeError):
        Pipfile.load_projectfile(None)
    fake_path = Path("my_fake_directory").absolute()
    with pytest.raises(FileNotFoundError):
        Pipfile.load_projectfile(fake_path)
    project_dir = pathlib_tmpdir.joinpath("project")
    project_dir.mkdir()
    with pytest.raises(RequirementError):
        Pipfile.load_projectfile(project_dir, create=False)

def test_failures(pathlib_tmpdir):
    with pytest.raises(RuntimeError):
        Pipfile.load_projectfile(None)
    fake_path = Path("my_fake_directory").absolute()
    with pytest.raises(FileNotFoundError):
        Pipfile.load_projectfile(fake_path)
    project_dir = pathlib_tmpdir.joinpath("project")
    project_dir.mkdir()
    with pytest.raises(RequirementError):
        Pipfile.load_projectfile(project_dir, create=False)