Misc fixes for unit tests

Resolve issues with compatibility with SIMULATE_CAN_CONNECT changes
in ops.testing.

Add Python 3.10 testing.

ops-sunbeam/.github/workflows/tox.yaml

@@ -9,8 +9,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9]
-
+        python-version:
+          - "3.8"
+          - "3.9"
+          - "3.10"
     steps:
     - uses: actions/checkout@v1
     - name: Set up Python ${{ matrix.python-version }}

ops-sunbeam/advanced_sunbeam_openstack/test_utils.py

@@ -35,7 +35,12 @@ sys.path.append("src")  # noqa
 
 from ops import framework, model
 
-from ops.testing import Harness, _TestingModelBackend, _TestingPebbleClient
+from ops.testing import (
+    Harness,
+    _TestingModelBackend,
+    _TestingPebbleClient,
+    SIMULATE_CAN_CONNECT,
+)
 
 
 TEST_CA = '''-----BEGIN CERTIFICATE-----
@@ -552,6 +557,7 @@ def get_harness(
                 # /charm/containers/placement-api/pebble.socket
                 client.container_name = socket_path.split('/')[3]
                 self._pebble_clients[socket_path] = client
+            self._pebble_clients_can_connect[client] = not SIMULATE_CAN_CONNECT
             return client
 
         def network_get(

ops-sunbeam/tox.ini

@@ -47,17 +47,17 @@ basepython = python3
 deps = -r{toxinidir}/cookie-requirements.txt
 commands = /bin/true
 
-[testenv:py38]
+[testenv:py3.8]
 basepython = python3.8
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 
-[testenv:py39]
+[testenv:py3.9]
 basepython = python3.9
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 
-[testenv:py310]
+[testenv:py3.10]
 basepython = python3.10
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt

ops-sunbeam/unit_tests/__init__.py

@@ -13,3 +13,5 @@
 # limitations under the License.
 
 """Unit tests for aso."""
+import ops.testing
+ops.testing.SIMULATE_CAN_CONNECT = True

ops-sunbeam/unit_tests/test_core.py

@@ -47,9 +47,7 @@ class TestOSBaseOperatorCharm(test_utils.CharmTestCase):
 
     def set_pebble_ready(self) -> None:
         """Set pebble ready event."""
-        container = self.harness.model.unit.get_container("my-service")
-        # Emit the PebbleReadyEvent
-        self.harness.charm.on.my_service_pebble_ready.emit(container)
+        self.harness.container_pebble_ready('my-service')
 
     def test_pebble_ready_handler(self) -> None:
         """Test is raised and observed."""