installers/charm/pla/tests/test_charm.py

#!/usr/bin/env python3
# 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
##

import sys
from typing import NoReturn
import unittest


from charm import PlaCharm
from ops.model import ActiveStatus, BlockedStatus
from ops.testing import Harness


class TestCharm(unittest.TestCase):
    """Pla Charm unit tests."""

    def setUp(self) -> NoReturn:
        """Test setup"""
        self.image_info = sys.modules["oci_image"].OCIImageResource().fetch()
        self.harness = Harness(PlaCharm)
        self.harness.set_leader(is_leader=True)
        self.harness.begin()
        self.config = {
            "log_level": "INFO",
            "mongodb_uri": "",
        }
        self.harness.update_config(self.config)

    def test_config_changed_no_relations(
        self,
    ) -> NoReturn:
        """Test ingress resources without HTTP."""

        self.harness.charm.on.config_changed.emit()

        # Assertions
        self.assertIsInstance(self.harness.charm.unit.status, BlockedStatus)
        self.assertTrue(
            all(
                relation in self.harness.charm.unit.status.message
                for relation in ["mongodb", "kafka"]
            )
        )

    def test_config_changed_non_leader(
        self,
    ) -> NoReturn:
        """Test ingress resources without HTTP."""
        self.harness.set_leader(is_leader=False)
        self.harness.charm.on.config_changed.emit()

        # Assertions
        self.assertIsInstance(self.harness.charm.unit.status, ActiveStatus)

    def test_with_relations_and_mongodb_config(
        self,
    ) -> NoReturn:
        "Test with relations and mongodb config (internal)"
        self.initialize_kafka_relation()
        self.initialize_mongo_config()
        # Verifying status
        self.assertNotIsInstance(self.harness.charm.unit.status, BlockedStatus)

    def test_with_relations(
        self,
    ) -> NoReturn:
        "Test with relations (internal)"
        self.initialize_kafka_relation()
        self.initialize_mongo_relation()
        # Verifying status
        self.assertNotIsInstance(self.harness.charm.unit.status, BlockedStatus)

    def test_exception_mongodb_relation_and_config(
        self,
    ) -> NoReturn:
        "Test with relation and config for Mongodb. Test must fail"
        self.initialize_mongo_relation()
        self.initialize_mongo_config()
        # Verifying status
        self.assertIsInstance(self.harness.charm.unit.status, BlockedStatus)

    def initialize_kafka_relation(self):
        kafka_relation_id = self.harness.add_relation("kafka", "kafka")
        self.harness.add_relation_unit(kafka_relation_id, "kafka/0")
        self.harness.update_relation_data(
            kafka_relation_id, "kafka", {"host": "kafka", "port": 9092}
        )

    def initialize_mongo_config(self):
        self.harness.update_config({"mongodb_uri": "mongodb://mongo:27017"})

    def initialize_mongo_relation(self):
        mongodb_relation_id = self.harness.add_relation("mongodb", "mongodb")
        self.harness.add_relation_unit(mongodb_relation_id, "mongodb/0")
        self.harness.update_relation_data(
            mongodb_relation_id,
            "mongodb/0",
            {"connection_string": "mongodb://mongo:27017"},
        )


if __name__ == "__main__":
    unittest.main()