pytest tests not running in isolation

[MichaelThamm]

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Example Code

conftest.py

import pytest
from typer.testing import CliRunner

from juju_doctor.main import app


@pytest.fixture(scope="function")  # I was hoping this would work, but doesn't
def runner():
    return CliRunner()


@pytest.fixture(scope="function")  # I was hoping this would work, but doesn't
def app_fixture():
    return app

my-test.py

import json

def test_1(runner, app_fixture):
    test_args = ["example"]
    result = runner.invoke(app_fixture, test_args)
    assert len(json.loads(result.stdout)["Results"]["children"]) == 1 # Now has len == 1


def test_2(runner, app_fixture):
    test_args = ["example"]
    result = runner.invoke(app_fixture, test_args)
    assert len(json.loads(result.stdout)["Results"]["children"]) == 1  # Now has len == 2

Description

I have an app and I want to add tests for my app. With many pytests using typer.testing.CliRunner.invoke -> Result, the state grows, and I cannot figure out why! I tried to use a fixture, scoped to function, for my imported juju_doctor.main.app and typer.testing.CliRunner. This did not work 🥀

@pytest.fixture(scope="function")
def app_fixture():
    return app

Operating System

Linux

Operating System Details

Ubuntu 24.04 LTS

Typer Version

0.15.3

Python Version

3.10.0

Additional Context

Here is my app if you are curious:

• https://github.com/canonical/juju-doctor/tree/main