From: David Garcia <david.garcia@canonical.com>
Date: Wed, 3 Feb 2021 10:10:28 +0000 (+0100)
Subject: Add tox tests for osm charms in devops
X-Git-Tag: branch-sol006v331-start~43
X-Git-Url: https://osm.etsi.org/gitweb/?a=commitdiff_plain;h=refs%2Fchanges%2F47%2F10247%2F17;p=osm%2Fdevops.git

Add tox tests for osm charms in devops

Change-Id: Ibbf1154e514bf8a91ed6d19b6bbf5fce0079da0c
Signed-off-by: David Garcia <david.garcia@canonical.com>
---

diff --git a/Dockerfile b/Dockerfile
index d08f3bb6..ffc36135 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,24 @@
-FROM ubuntu:16.04
+# Copyright 2021 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
 
-RUN apt-get update && apt-get -y install git build-essential dh-make
+FROM ubuntu:18.04
+
+RUN apt-get update && apt-get -y install git build-essential dh-make tox python python3.8 python3-dev python3-pip
diff --git a/devops-stages/stage-test.sh b/devops-stages/stage-test.sh
index 1a248525..3e5196f0 100755
--- a/devops-stages/stage-test.sh
+++ b/devops-stages/stage-test.sh
@@ -1 +1,26 @@
 #!/bin/sh
+#   Copyright 2021 Canonical Ltd.
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+set -eux
+CURRENT_DIR=`pwd`
+
+# Execute tests for charms
+CHARM_PATH="./installers/charm"
+CHARM_NAMES="keystone lcm mon nbi ng-ui pla pol prometheus ro"
+for charm in $CHARM_NAMES; do
+    cd $CHARM_PATH/$charm
+    tox --recreate
+    cd $CURRENT_DIR
+done
\ No newline at end of file
diff --git a/installers/charm/grafana/.gitignore b/installers/charm/grafana/.gitignore
index 3ca6f3ae..01ec352a 100644
--- a/installers/charm/grafana/.gitignore
+++ b/installers/charm/grafana/.gitignore
@@ -23,6 +23,6 @@ venv
 .vscode
 build
 grafana.charm
-.coverage
+.coverage*
 .stestr
 cover
diff --git a/installers/charm/grafana/tox.ini b/installers/charm/grafana/tox.ini
index 12a1f85d..069cf105 100644
--- a/installers/charm/grafana/tox.ini
+++ b/installers/charm/grafana/tox.ini
@@ -26,7 +26,7 @@ sitepackages = False
 skip_missing_interpreters = False
 
 [testenv]
-basepython = python3
+basepython = python3.8
 setenv =
   PYTHONHASHSEED=0
   PYTHONPATH = {toxinidir}/src
diff --git a/installers/charm/keystone/.gitignore b/installers/charm/keystone/.gitignore
index 97fc8b44..43fcb62c 100644
--- a/installers/charm/keystone/.gitignore
+++ b/installers/charm/keystone/.gitignore
@@ -14,4 +14,7 @@
 .vscode
 .tox
 build
-keystone.charm
\ No newline at end of file
+keystone.charm
+.stestr
+.coverage*
+cover/
\ No newline at end of file
diff --git a/installers/charm/keystone/src/charm.py b/installers/charm/keystone/src/charm.py
index 637461e3..d5c169b6 100755
--- a/installers/charm/keystone/src/charm.py
+++ b/installers/charm/keystone/src/charm.py
@@ -68,6 +68,7 @@ class KeystoneEvents(CharmEvents):
 
     configure_pod = EventSource(ConfigurePodEvent)
 
+
 class KeystoneCharm(CharmBase):
     """Keystone K8s Charm"""
 
@@ -142,7 +143,7 @@ class KeystoneCharm(CharmBase):
             event (EventBase): DB relation event to access database
                                information.
         """
-        if not event.unit in event.relation.data:
+        if event.unit not in event.relation.data:
             return
         relation_data = event.relation.data[event.unit]
         db_host = relation_data.get("host")
@@ -168,7 +169,6 @@ class KeystoneCharm(CharmBase):
             self.state.db_password = db_password
             self.on.configure_pod.emit()
 
-
     def _on_db_relation_departed(self, event: EventBase) -> NoReturn:
         """Clears data from db relation.
 
diff --git a/installers/charm/keystone/tests/__init__.py b/installers/charm/keystone/tests/__init__.py
new file mode 100644
index 00000000..6004c6d5
--- /dev/null
+++ b/installers/charm/keystone/tests/__init__.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+# Copyright 2020 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
+
+"""Init mocking for unit tests."""
+
+# import sys
+# import mock
+
+# sys.path.append("src")
+
+# oci_image = mock.MagicMock()
+# sys.modules["oci_image"] = oci_image
diff --git a/installers/charm/keystone/tests/test_charm.py b/installers/charm/keystone/tests/test_charm.py
new file mode 100644
index 00000000..8cb86048
--- /dev/null
+++ b/installers/charm/keystone/tests/test_charm.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+# Copyright 2020 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
+
+from typing import NoReturn
+import unittest
+
+from ops.testing import Harness
+
+from charm import KeystoneCharm
+
+
+class TestCharm(unittest.TestCase):
+    """Keystone Charm unit tests."""
+
+    def setUp(self) -> NoReturn:
+        """Test setup"""
+        self.harness = Harness(KeystoneCharm)
+        self.harness.set_leader(is_leader=True)
+        self.harness.begin()
+
+    def test_on_start_without_relations(self) -> NoReturn:
+        """Test installation without any relation."""
+        self.harness.charm.on.config_changed.emit()
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/installers/charm/keystone/tox.ini b/installers/charm/keystone/tox.ini
index cff5193b..781f74ee 100644
--- a/installers/charm/keystone/tox.ini
+++ b/installers/charm/keystone/tox.ini
@@ -1,47 +1,82 @@
 # Copyright 2020 Canonical Ltd.
 #
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
 #
-#     http://www.apache.org/licenses/LICENSE-2.0
+#         http://www.apache.org/licenses/LICENSE-2.0
 #
-#     Unless required by applicable law or agreed to in writing, software
-#     distributed under the License is distributed on an "AS IS" BASIS,
-#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#     See the License for the specific language governing permissions and
-#     limitations under the License.
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
+
 [tox]
-envlist = pep8
 skipsdist = True
+envlist = unit, lint
+sitepackages = False
+skip_missing_interpreters = False
 
 [testenv]
-setenv = VIRTUAL_ENV={envdir}
-         PYTHONHASHSEED=0
-install_command =
-  pip install {opts} {packages}
+basepython = python3.8
+setenv =
+  PYTHONHASHSEED=0
+  PYTHONPATH = {toxinidir}/src
+  CHARM_NAME = keystone
 
 [testenv:build]
-basepython = python3
 passenv=HTTP_PROXY HTTPS_PROXY NO_PROXY
-whitelist_externals = charmcraft
-                      rm
-                      unzip
+whitelist_externals =
+  charmcraft
+  rm
+  unzip
 commands =
-    rm -rf release
-    charmcraft build
-    unzip keystone.charm -d release
+  rm -rf release keystone.charm
+  charmcraft build
+  unzip keystone.charm -d release
+
+[testenv:unit]
+commands =
+  coverage erase
+  stestr run --slowest --test-path=./tests --top-dir=./
+  coverage combine
+  coverage html -d cover
+  coverage xml -o cover/coverage.xml
+  coverage report
+deps =
+  coverage
+  stestr
+  mock
+  ops
+  -rrequirements.txt
+setenv =
+  {[testenv]setenv}
+  PYTHON=coverage run
 
 [testenv:lint]
-basepython = python3
 deps =
-    black
-    yamllint
-    flake8
+  black
+  yamllint
+  flake8
 commands =
-    black --check --diff . --exclude "build/|.tox/|mod/|lib/"
-    yamllint .
-    flake8 . --max-line-length=100 --exclude "build/ .tox/ mod/ lib/"
+  black --check --diff . --exclude "build/|.tox/|mod/|lib/|release/"
+  yamllint .
+  flake8 . --max-line-length=100 --ignore="E501,W503,W504,F722" --exclude "build/ .tox/ mod/ lib/ release/"
 
-[testenv:venv]
-commands = {posargs}
+[coverage:run]
+branch = True
+concurrency = multiprocessing
+parallel = True
+source =
+  .
+omit =  
+  .tox/*
+  tests/*
diff --git a/installers/charm/lcm/tox.ini b/installers/charm/lcm/tox.ini
index bc7ee37a..068b4c55 100644
--- a/installers/charm/lcm/tox.ini
+++ b/installers/charm/lcm/tox.ini
@@ -26,7 +26,7 @@ sitepackages = False
 skip_missing_interpreters = False
 
 [testenv]
-basepython = python3
+basepython = python3.8
 setenv =
   PYTHONHASHSEED=0
   PYTHONPATH = {toxinidir}/src
diff --git a/installers/charm/mon/tox.ini b/installers/charm/mon/tox.ini
index 0b1ab82c..7ddaf8d1 100644
--- a/installers/charm/mon/tox.ini
+++ b/installers/charm/mon/tox.ini
@@ -26,7 +26,7 @@ sitepackages = False
 skip_missing_interpreters = False
 
 [testenv]
-basepython = python3
+basepython = python3.8
 setenv =
   PYTHONHASHSEED=0
   PYTHONPATH = {toxinidir}/src
@@ -66,10 +66,9 @@ deps =
   yamllint
   flake8
 commands =
-  black --check --diff . --exclude "build/|.tox/|mod/|lib/"
+  black --check --diff . --exclude "build/|.tox/|mod/|lib/|release/"
   yamllint .
-  flake8 . --max-line-length=100 --ignore="E501,W503,W504,F722" --exclude "build/ .tox/ mod/ lib/"
-
+  flake8 . --max-line-length=100 --ignore="E501,W503,W504,F722" --exclude "build/ .tox/ mod/ lib/ release/"
 [coverage:run]
 branch = True
 concurrency = multiprocessing
diff --git a/installers/charm/nbi/.gitignore b/installers/charm/nbi/.gitignore
index f920a7f1..05bdb52d 100644
--- a/installers/charm/nbi/.gitignore
+++ b/installers/charm/nbi/.gitignore
@@ -23,6 +23,6 @@ venv
 .vscode
 build
 nbi.charm
-.coverage
+.coverage*
 .stestr
 cover
\ No newline at end of file
diff --git a/installers/charm/nbi/tox.ini b/installers/charm/nbi/tox.ini
index b7b09123..5989669d 100644
--- a/installers/charm/nbi/tox.ini
+++ b/installers/charm/nbi/tox.ini
@@ -26,7 +26,7 @@ sitepackages = False
 skip_missing_interpreters = False
 
 [testenv]
-basepython = python3
+basepython = python3.8
 setenv =
   PYTHONHASHSEED=0
   PYTHONPATH = {toxinidir}/src
diff --git a/installers/charm/ng-ui/.gitignore b/installers/charm/ng-ui/.gitignore
index dfaa805f..9c7c0495 100644
--- a/installers/charm/ng-ui/.gitignore
+++ b/installers/charm/ng-ui/.gitignore
@@ -13,4 +13,7 @@
 #     limitations under the License.
 .vscode
 build
-ng-ui.charm
\ No newline at end of file
+ng-ui.charm
+.stestr
+.coverage*
+cover/
\ No newline at end of file
diff --git a/installers/charm/ng-ui/src/charm.py b/installers/charm/ng-ui/src/charm.py
index 21102e4c..944d8cec 100755
--- a/installers/charm/ng-ui/src/charm.py
+++ b/installers/charm/ng-ui/src/charm.py
@@ -93,7 +93,7 @@ class NgUiCharm(CharmBase):
         Args:
             event (EventBase): NBI relation event.
         """
-        if not event.unit in event.relation.data:
+        if event.unit not in event.relation.data:
             return
         relation_data = event.relation.data[event.unit]
         nbi_host = relation_data.get("host")
diff --git a/installers/charm/ng-ui/tests/__init__.py b/installers/charm/ng-ui/tests/__init__.py
new file mode 100644
index 00000000..6004c6d5
--- /dev/null
+++ b/installers/charm/ng-ui/tests/__init__.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+# Copyright 2020 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
+
+"""Init mocking for unit tests."""
+
+# import sys
+# import mock
+
+# sys.path.append("src")
+
+# oci_image = mock.MagicMock()
+# sys.modules["oci_image"] = oci_image
diff --git a/installers/charm/ng-ui/tests/test_charm.py b/installers/charm/ng-ui/tests/test_charm.py
new file mode 100644
index 00000000..1cde2dfa
--- /dev/null
+++ b/installers/charm/ng-ui/tests/test_charm.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+# Copyright 2020 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
+
+from typing import NoReturn
+import unittest
+
+from ops.testing import Harness
+
+from charm import NgUiCharm
+
+
+class TestCharm(unittest.TestCase):
+    """PLA Charm unit tests."""
+
+    def setUp(self) -> NoReturn:
+        """Test setup"""
+        self.harness = Harness(NgUiCharm)
+        self.harness.set_leader(is_leader=True)
+        self.harness.begin()
+
+    def test_on_start_without_relations(self) -> NoReturn:
+        """Test installation without any relation."""
+        self.harness.charm.on.config_changed.emit()
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/installers/charm/ng-ui/tox.ini b/installers/charm/ng-ui/tox.ini
index 1c22bd55..e60f0b8c 100644
--- a/installers/charm/ng-ui/tox.ini
+++ b/installers/charm/ng-ui/tox.ini
@@ -1,65 +1,82 @@
-#   Copyright 2020 Canonical Ltd.
+# Copyright 2020 Canonical Ltd.
 #
-#   Licensed under the Apache License, Version 2.0 (the "License");
-#   you may not use this file except in compliance with the License.
-#   You may obtain a copy of the License at
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
 #
-#       http://www.apache.org/licenses/LICENSE-2.0
+#         http://www.apache.org/licenses/LICENSE-2.0
 #
-#   Unless required by applicable law or agreed to in writing, software
-#   distributed under the License is distributed on an "AS IS" BASIS,
-#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#   See the License for the specific language governing permissions and
-#   limitations under the License.
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
+
 [tox]
-envlist = pep8
 skipsdist = True
+envlist = unit, lint
+sitepackages = False
+skip_missing_interpreters = False
 
 [testenv]
-setenv = VIRTUAL_ENV={envdir}
-         PYTHONHASHSEED=0
-whitelist_externals = juju
-passenv = HOME TERM CS_API_* OS_* AMULET_*
-install_command =
-  pip install {opts} {packages}
+basepython = python3.8
+setenv =
+  PYTHONHASHSEED=0
+  PYTHONPATH = {toxinidir}/src
+  CHARM_NAME = ng-ui
 
 [testenv:build]
-basepython = python3
 passenv=HTTP_PROXY HTTPS_PROXY NO_PROXY
-whitelist_externals = charmcraft
-                      rm
-                      unzip
+whitelist_externals =
+  charmcraft
+  rm
+  unzip
 commands =
-    rm -rf release
-    charmcraft build
-    unzip ng-ui.charm -d release
+  rm -rf release ng-ui.charm
+  charmcraft build
+  unzip ng-ui.charm -d release
 
-[testenv:black]
-basepython = python3
-deps =
-    black
-    yamllint
+[testenv:unit]
 commands =
-    black --check --diff src
-    yamllint .
-
-[testenv:pep8]
-basepython = python3
-deps=charm-tools
-commands = charm-proof
+  coverage erase
+  stestr run --slowest --test-path=./tests --top-dir=./
+  coverage combine
+  coverage html -d cover
+  coverage xml -o cover/coverage.xml
+  coverage report
+deps =
+  coverage
+  stestr
+  mock
+  ops
+  -rrequirements.txt
+setenv =
+  {[testenv]setenv}
+  PYTHON=coverage run
 
-[testenv:func-noop]
-basepython = python3
+[testenv:lint]
+deps =
+  black
+  yamllint
+  flake8
 commands =
-    true
-
-[testenv:func]
-basepython = python3
-commands = functest-run-suite
-
-[testenv:func-smoke]
-basepython = python3
-commands = functest-run-suite --keep-model --smoke
+  black --check --diff . --exclude "build/|.tox/|mod/|lib/|release/"
+  yamllint .
+  flake8 . --max-line-length=100 --ignore="E501,W503,W504,F722" --exclude "build/ .tox/ mod/ lib/ release/"
 
-[testenv:venv]
-commands = {posargs}
+[coverage:run]
+branch = True
+concurrency = multiprocessing
+parallel = True
+source =
+  .
+omit =  
+  .tox/*
+  tests/*
diff --git a/installers/charm/pla/.gitignore b/installers/charm/pla/.gitignore
index db6d41ae..dad4b21d 100644
--- a/installers/charm/pla/.gitignore
+++ b/installers/charm/pla/.gitignore
@@ -13,4 +13,7 @@
 #     limitations under the License.
 .vscode
 build
-pla.charm
\ No newline at end of file
+pla.charm
+.stestr
+.coverage*
+cover/
\ No newline at end of file
diff --git a/installers/charm/pla/src/charm.py b/installers/charm/pla/src/charm.py
index 16e7303f..6847580f 100755
--- a/installers/charm/pla/src/charm.py
+++ b/installers/charm/pla/src/charm.py
@@ -13,21 +13,17 @@
 #   See the License for the specific language governing permissions and
 #   limitations under the License.
 
-from glob import glob
 import logging
-from pathlib import Path
-from string import Template
-import sys
 
 from ops.charm import CharmBase
-from ops.framework import StoredState, Object
+from ops.framework import StoredState
 from ops.main import main
 from ops.model import (
     ActiveStatus,
     MaintenanceStatus,
     WaitingStatus,
 )
-
+from typing import NoReturn
 
 logger = logging.getLogger(__name__)
 
@@ -35,8 +31,8 @@ logger = logging.getLogger(__name__)
 class PLACharm(CharmBase):
     state = StoredState()
 
-    def __init__(self, framework, key):
-        super().__init__(framework, key)
+    def __init__(self, *args) -> NoReturn:
+        super().__init__(*args)
         self.state.set_default(spec=None)
         self.state.set_default(kafka_host=None)
         self.state.set_default(kafka_port=None)
diff --git a/installers/charm/pla/tests/__init__.py b/installers/charm/pla/tests/__init__.py
new file mode 100644
index 00000000..6004c6d5
--- /dev/null
+++ b/installers/charm/pla/tests/__init__.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+# Copyright 2020 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
+
+"""Init mocking for unit tests."""
+
+# import sys
+# import mock
+
+# sys.path.append("src")
+
+# oci_image = mock.MagicMock()
+# sys.modules["oci_image"] = oci_image
diff --git a/installers/charm/pla/tests/test_charm.py b/installers/charm/pla/tests/test_charm.py
new file mode 100644
index 00000000..dbc7be3b
--- /dev/null
+++ b/installers/charm/pla/tests/test_charm.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+# Copyright 2020 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
+
+from typing import NoReturn
+import unittest
+
+from ops.testing import Harness
+
+from charm import PLACharm
+
+
+class TestCharm(unittest.TestCase):
+    """PLA Charm unit tests."""
+
+    def setUp(self) -> NoReturn:
+        """Test setup"""
+        self.harness = Harness(PLACharm)
+        self.harness.set_leader(is_leader=True)
+        self.harness.begin()
+
+    def test_on_start_without_relations(self) -> NoReturn:
+        """Test installation without any relation."""
+        self.harness.charm.on.config_changed.emit()
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/installers/charm/pla/tox.ini b/installers/charm/pla/tox.ini
index 678a5ec5..32d78d3b 100644
--- a/installers/charm/pla/tox.ini
+++ b/installers/charm/pla/tox.ini
@@ -1,67 +1,81 @@
-#   Copyright 2020 Canonical Ltd.
+# Copyright 2020 Canonical Ltd.
 #
-#   Licensed under the Apache License, Version 2.0 (the "License");
-#   you may not use this file except in compliance with the License.
-#   You may obtain a copy of the License at
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
 #
-#       http://www.apache.org/licenses/LICENSE-2.0
+#         http://www.apache.org/licenses/LICENSE-2.0
 #
-#   Unless required by applicable law or agreed to in writing, software
-#   distributed under the License is distributed on an "AS IS" BASIS,
-#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#   See the License for the specific language governing permissions and
-#   limitations under the License.
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
 
 [tox]
-envlist = pep8
 skipsdist = True
+envlist = unit, lint
+sitepackages = False
+skip_missing_interpreters = False
 
 [testenv]
-setenv = VIRTUAL_ENV={envdir}
-         PYTHONHASHSEED=0
-whitelist_externals = juju
-passenv = HOME TERM CS_API_* OS_* AMULET_*
-install_command =
-  pip install {opts} {packages}
-
+basepython = python3.8
+setenv =
+  PYTHONHASHSEED=0
+  PYTHONPATH = {toxinidir}/src
+  CHARM_NAME = pla
 
 [testenv:build]
-basepython = python3
 passenv=HTTP_PROXY HTTPS_PROXY NO_PROXY
-whitelist_externals = charmcraft
-                      rm
-                      unzip
+whitelist_externals =
+  charmcraft
+  rm
+  unzip
 commands =
-    rm -rf release
-    charmcraft build
-    unzip pla.charm -d release
+  rm -rf release pla.charm
+  charmcraft build
+  unzip pla.charm -d release
 
-[testenv:black]
-basepython = python3
-deps =
-    black
-    yamllint
+[testenv:unit]
 commands =
-    black --check --diff src
-    yamllint .
-
-[testenv:pep8]
-basepython = python3
-deps=charm-tools
-commands = charm-proof
+  coverage erase
+  stestr run --slowest --test-path=./tests --top-dir=./
+  coverage combine
+  coverage html -d cover
+  coverage xml -o cover/coverage.xml
+  coverage report
+deps =
+  coverage
+  stestr
+  mock
+  ops
+setenv =
+  {[testenv]setenv}
+  PYTHON=coverage run
 
-[testenv:func-noop]
-basepython = python3
+[testenv:lint]
+deps =
+  black
+  yamllint
+  flake8
 commands =
-    true
-
-[testenv:func]
-basepython = python3
-commands = functest-run-suite
-
-[testenv:func-smoke]
-basepython = python3
-commands = functest-run-suite --keep-model --smoke
+  black --check --diff . --exclude "build/|.tox/|mod/|lib/|release/"
+  yamllint .
+  flake8 . --max-line-length=100 --ignore="E501,W503,W504,F722" --exclude "build/ .tox/ mod/ lib/ release/"
 
-[testenv:venv]
-commands = {posargs}
+[coverage:run]
+branch = True
+concurrency = multiprocessing
+parallel = True
+source =
+  .
+omit =  
+  .tox/*
+  tests/*
diff --git a/installers/charm/pol/tox.ini b/installers/charm/pol/tox.ini
index 25bf8306..ae324f82 100644
--- a/installers/charm/pol/tox.ini
+++ b/installers/charm/pol/tox.ini
@@ -26,7 +26,7 @@ sitepackages = False
 skip_missing_interpreters = False
 
 [testenv]
-basepython = python3
+basepython = python3.8
 setenv =
   PYTHONHASHSEED=0
   PYTHONPATH = {toxinidir}/src
diff --git a/installers/charm/prometheus/tox.ini b/installers/charm/prometheus/tox.ini
index a7625a6a..5491c07a 100644
--- a/installers/charm/prometheus/tox.ini
+++ b/installers/charm/prometheus/tox.ini
@@ -26,7 +26,7 @@ sitepackages = False
 skip_missing_interpreters = False
 
 [testenv]
-basepython = python3
+basepython = python3.8
 setenv =
   PYTHONHASHSEED=0
   PYTHONPATH = {toxinidir}/src
diff --git a/installers/charm/ro/tox.ini b/installers/charm/ro/tox.ini
index 44461453..8fd07d3d 100644
--- a/installers/charm/ro/tox.ini
+++ b/installers/charm/ro/tox.ini
@@ -26,7 +26,7 @@ sitepackages = False
 skip_missing_interpreters = False
 
 [testenv]
-basepython = python3
+basepython = python3.8
 setenv =
   PYTHONHASHSEED=0
   PYTHONPATH = {toxinidir}/src