AttributeError: 'ExposeChange' object has no attribute 'exposed_endpoints'

[rgildein]

This error occurred while using pytests-operator + juju==2.9.0, which build the tested charm and tried to deploy it inside bundle.

Environment:

platform linux -- Python 3.9.5, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
plugins: asyncio-0.15.1, operator-0.6.1

How to reproduce:

• run tox -e integration on top of this commit

Error:

_________________________________________________________________________________________________________________________________ test_build_and_deploy __________________________________________________________________________________________________________________________________
Traceback (most recent call last):
  File "/home/rg/canonical/charm-openstack-integrator/tests/integration/test_openstack_integrator_integration.py", line 16, in test_build_and_deploy
    await ops_test.model.deploy(bundle, trust=True)
  File "/home/rg/canonical/charm-openstack-integrator/.tox/integration/lib/python3.9/site-packages/juju/model.py", line 1446, in deploy
    await handler.execute_plan()
  File "/home/rg/canonical/charm-openstack-integrator/.tox/integration/lib/python3.9/site-packages/juju/bundle.py", line 167, in execute_plan 
    self.references[step.id_] = await change.run(self)
  File "/home/rg/canonical/charm-openstack-integrator/.tox/integration/lib/python3.9/site-packages/juju/bundle.py", line 825, in run
    return await context.model.applications[application].expose(self.exposed_endpoints)
AttributeError: 'ExposeChange' object has no attribute 'exposed_endpoints'
================================================================================================================================ short test summary info =================================================================================================================================
FAILED tests/integration/test_openstack_integrator_integration.py::test_build_and_deploy - AttributeError: 'ExposeChange' object has no attribute 'exposed_endpoints'