Pytest: Hard-coded path - manually replace attribute

---

examples/pytest/hard-coded-path/test_app.py

import app

def test_app():
    app.data_file = 'test_1.json'    # manually overwrite

    res = app.do_something()       # it is now test_1.json
    ...

def test_again():
    res = app.do_something()      # it is still test_1.json
    ...