test: migrate pytest-operator to jubilant

[yanksyoon]

Applicable spec:

Overview

• Migrate pytest-operator to jubilant as a mitigation to bugs with websocket disconnects

Rationale

• Issues with pytest-operator and juju leads to websocket disconnect errors, blocking CI

Juju Events Changes

Module Changes

Library Changes

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, senior-review-required, documentation)
• The docs/changelog.md is updated with user-relevant changes in the format of keep a changelog v1.1.0
• The application version is incremented in app/pyproject.toml

Only test changes.

[Copilot]

Pull request overview

Migrates the repository’s integration test harness from pytest-operator/async Juju usage to the jubilant (synchronous) Juju wrapper to reduce CI failures from websocket disconnects.

Changes:

• Replace pytest-operator + asyncio-based tests/fixtures with jubilant-based synchronous equivalents.
• Rework integration fixtures to create/manage a temporary Juju model via jubilant.temp_model(), plus add --keep-models for debugging.
• Update tox and integration requirements to drop async-only dependencies and add jubilant.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tox.ini	Replace pytest-operator/asyncio deps with jubilant in lint/integration envs.
tests/integration/types.py	Update test config typing from Model to jubilant.Juju.
tests/integration/test_upgrade.py	Port upgrade flow to jubilant APIs and synchronous waiting/log checks.
tests/integration/test_charm.py	Port integration tests to jubilant APIs and synchronous helpers/context management.
tests/integration/requirements.txt	Remove async-specific dependency (nest_asyncio).
tests/integration/helpers.py	Convert wait_for/wait_for_images from async to sync utilities.
tests/integration/conftest.py	Replace ops_test/model fixtures with a jubilant-managed temporary model + updated deploy/secret/config flows.
tests/conftest.py	Add --keep-models pytest CLI option to support jubilant temp model retention.

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[florentianayuwono]

lgtm thankyou!

[yhaliaw]

We need to review the logging of the jubilant first.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

Comments suppressed due to low confidence (1)

tests/integration/conftest.py:410

• This function uses await inside a non-async def and references app/app.model even though no app variable is defined (the deploy call doesn’t capture a return value). This is a syntax/runtime error; rewrite using jubilant operations (deploy, grant secrets, set config) without await, or make the whole fixture async and restore the asyncio toolchain.

    test_configs.juju.deploy(
        test_configs.charm_file,
        app_name,
        constraints=base_machine_constraint,
        config=app_config,
        log=False,
    )
    await app.model.grant_secret(openstack_password_secret.name, app.name)
    await app.model.grant_secret(script_secret.name, app.name)
    await app.set_config(
        {

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[yanksyoon]

Initial review done