I’ve read the pytest fixture parametrization documentation but struggle on the most simple task now.

How can I have f and f1 returned as_file?

import pytest

@pytest.fixture
def as_file(arg):
    with open(arg) as f:
        return f

@pytest.fixture
def f(as_file):
    return as_file("f.txt")

@pytest.fixture
def f1(as_file):
    return as_file("f1.txt")

def test(f,f2):
    assert f.name == "f.txt"
    assert f1.name == "f1.txt"