pytest-jubilant 0.2

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Pytest plugin for jubilant.

Eases the transition from pytest-operator to jubilant. And some cool stuff on top.

Fixtures

juju

This is a model-scoped fixture that uses a temporary model and tears it down on context exit. Usage:

from jubilant import Juju, all_active

def test_deploy(juju: Juju):
    juju.deploy("./foo.charm", "foo")
    juju.wait(
        lambda status: all_active(status, "foo"),
        timeout=1000
    )

Pytest CLI options

--model

Target a specific, existing model instead of provisioning a fresh, temporary one. Do note that this model won't be torn down at the end of the test run. Usage:

juju add-model mymodel pytest ./tests/integration -k test_foo --model "mymodel"

--switch

Switch to the (randomly-named) model that is currently in scope, so you can keep an eye on the juju status as the tests progress. (Won't work well if you're running multiple test modules in parallel.)

pytest ./tests/integration --switch

--keep-models

Skip destroying the newly generated models when the tests are done. Usage:

pytest ./tests/integration --keep-models

--no-teardown

Skip all tests marked with teardown. Useful to inspect the state of a model after a (failed) test run. Implies --keep-models.

pytest ./tests/integration --no-teardown

--no-setup

Skip all tests marked with setup. Especially useful when re-running a test on an existing model which is already set-up, but not torn down. See this article for the idea behind this workflow. Usage:

pytest ./tests/integration --no-teardown # make a note of the temporary model name pytest ./tests/integration --model --no-setup

Markers

setup

Marker for tests that prepare (parts of) a model.

Usage:

import pytest

@pytest.mark.setup
def test_deploy(juju):
    juju.deploy("A")
    juju.deploy("B")

@pytest.mark.setup
def test_relate(juju):
    juju.integrate("A", "B")

teardown

Marker for tests that destroy (parts of) a model.

Usage:

import pytest

@pytest.mark.teardown
def test_disintegrate(juju):
    juju.remove_relation("A", "B")

@pytest.mark.teardown
def test_destroy(juju):
    juju.remove_application("A")
    juju.remove_application("B")

Utilities

pack_charm

Wrapper around charmcraft pack to build a charm and return the packed charm path and its resources, ready to be passed to juju.deploy.

from pytest_jubilant import pack_charm
import pytest

@pytest.mark.setup
def test_build_deploy_charm(juju):
    out = pack_charm("/path/to/foo-charm-repo-root-dir/")
    juju.deploy(
        out.charm,
        "foo",
        # the resources can only be inferred from the charm's metadata/charmcraft yaml 
        # if you use the `upstream-source` convention
        resources=out.resources,
        num_units=3,
    )

# example /path/to/foo-charm-repo-root-dir/charmcraft.yaml

# [snip] 
resources:
  nginx-image:
    type: oci-image
    description: OCI image for nginx
    upstream-source: ubuntu/nginx:1.24-24.04_beta
  nginx-prometheus-exporter-image:
    type: oci-image
    description: OCI image for nginx-prometheus-exporter
    upstream-source: nginx/nginx-prometheus-exporter:1.1.0