Refactoring RO Charm to use Operator Framework

This refactoring work includes tests.

Note 1: old charm is in ro-k8s folder.
Note 2: relation-departed is currently not tested because there is
        no function to remove a relation in the Testing Harness.
        There is currently one issue open and the Charmcraft team
        should provide feedback soon.

Change-Id: Ia97de802aec2c4e10a1d2c86ba2515d3f17f55af
Signed-off-by: sousaedu <eduardo.sousa@canonical.com>
diff --git a/installers/charm/ro/tests/__init__.py b/installers/charm/ro/tests/__init__.py
new file mode 100644
index 0000000..d0d973a
--- /dev/null
+++ b/installers/charm/ro/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/ro/tests/test_charm.py b/installers/charm/ro/tests/test_charm.py
new file mode 100644
index 0000000..cdc384f
--- /dev/null
+++ b/installers/charm/ro/tests/test_charm.py
@@ -0,0 +1,353 @@
+#!/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.model import BlockedStatus
+
+from ops.testing import Harness
+
+from charm import RoCharm
+
+
+class TestCharm(unittest.TestCase):
+    """RO Charm unit tests."""
+
+    def setUp(self) -> NoReturn:
+        """Test setup"""
+        self.harness = Harness(RoCharm)
+        self.harness.set_leader(is_leader=True)
+        self.harness.begin()
+
+    def test_on_start_without_relations_ng_ro(self) -> NoReturn:
+        """Test installation without any relation."""
+        self.harness.charm.on.start.emit()
+
+        # Verifying status
+        self.assertIsInstance(self.harness.charm.unit.status, BlockedStatus)
+
+        # Verifying status message
+        self.assertGreater(len(self.harness.charm.unit.status.message), 0)
+        self.assertTrue(
+            self.harness.charm.unit.status.message.startswith("Waiting for ")
+        )
+        self.assertIn("kafka", self.harness.charm.unit.status.message)
+        self.assertIn("mongodb", self.harness.charm.unit.status.message)
+        self.assertTrue(self.harness.charm.unit.status.message.endswith(" relations"))
+
+    def test_on_start_without_relations_no_ng_ro(self) -> NoReturn:
+        """Test installation without any relation."""
+        self.harness.update_config({"enable_ng_ro": False})
+
+        self.harness.charm.on.start.emit()
+
+        # Verifying status
+        self.assertIsInstance(self.harness.charm.unit.status, BlockedStatus)
+
+        # Verifying status message
+        self.assertGreater(len(self.harness.charm.unit.status.message), 0)
+        self.assertTrue(
+            self.harness.charm.unit.status.message.startswith("Waiting for ")
+        )
+        self.assertIn("mysql", self.harness.charm.unit.status.message)
+        self.assertTrue(self.harness.charm.unit.status.message.endswith(" relation"))
+
+    def test_on_start_with_relations_ng_ro(self) -> NoReturn:
+        """Test deployment with NG-RO."""
+        expected_result = {
+            "version": 3,
+            "containers": [
+                {
+                    "name": "ro",
+                    "imageDetails": self.harness.charm.image.fetch(),
+                    "imagePullPolicy": "Always",
+                    "ports": [
+                        {
+                            "name": "ro",
+                            "containerPort": 9090,
+                            "protocol": "TCP",
+                        }
+                    ],
+                    "envConfig": {
+                        "OSMRO_LOG_LEVEL": "INFO",
+                        "OSMRO_MESSAGE_DRIVER": "kafka",
+                        "OSMRO_MESSAGE_HOST": "kafka",
+                        "OSMRO_MESSAGE_PORT": 9090,
+                        "OSMRO_DATABASE_DRIVER": "mongo",
+                        "OSMRO_DATABASE_URI": "mongodb://mongo",
+                        "OSMRO_DATABASE_COMMONKEY": "osm",
+                    },
+                    "kubernetes": {
+                        "startupProbe": {
+                            "exec": {"command": ["/usr/bin/pgrep", "python3"]},
+                            "initialDelaySeconds": 60,
+                            "timeoutSeconds": 5,
+                        },
+                        "readinessProbe": {
+                            "httpGet": {
+                                "path": "/openmano/tenants",
+                                "port": 9090,
+                            },
+                            "periodSeconds": 10,
+                            "timeoutSeconds": 5,
+                            "successThreshold": 1,
+                            "failureThreshold": 3,
+                        },
+                        "livenessProbe": {
+                            "httpGet": {
+                                "path": "/openmano/tenants",
+                                "port": 9090,
+                            },
+                            "initialDelaySeconds": 600,
+                            "periodSeconds": 10,
+                            "timeoutSeconds": 5,
+                            "successThreshold": 1,
+                            "failureThreshold": 3,
+                        },
+                    },
+                }
+            ],
+            "kubernetesResources": {"ingressResources": []},
+        }
+
+        self.harness.charm.on.start.emit()
+
+        # Initializing the kafka relation
+        relation_id = self.harness.add_relation("kafka", "kafka")
+        self.harness.add_relation_unit(relation_id, "kafka/0")
+        self.harness.update_relation_data(
+            relation_id,
+            "kafka/0",
+            {
+                "host": "kafka",
+                "port": 9090,
+            },
+        )
+
+        # Initializing the mongodb relation
+        relation_id = self.harness.add_relation("mongodb", "mongodb")
+        self.harness.add_relation_unit(relation_id, "mongodb/0")
+        self.harness.update_relation_data(
+            relation_id,
+            "mongodb/0",
+            {
+                "connection_string": "mongodb://mongo",
+            },
+        )
+
+        # Verifying status
+        self.assertNotIsInstance(self.harness.charm.unit.status, BlockedStatus)
+
+        pod_spec, _ = self.harness.get_pod_spec()
+
+        self.assertDictEqual(expected_result, pod_spec)
+
+    def test_on_start_with_relations_no_ng_ro(self) -> NoReturn:
+        """Test deployment with old RO."""
+        self.harness.update_config({"enable_ng_ro": False})
+
+        expected_result = {
+            "version": 3,
+            "containers": [
+                {
+                    "name": "ro",
+                    "imageDetails": self.harness.charm.image.fetch(),
+                    "imagePullPolicy": "Always",
+                    "ports": [
+                        {
+                            "name": "ro",
+                            "containerPort": 9090,
+                            "protocol": "TCP",
+                        }
+                    ],
+                    "envConfig": {
+                        "OSMRO_LOG_LEVEL": "INFO",
+                        "RO_DB_HOST": "mysql",
+                        "RO_DB_OVIM_HOST": "mysql",
+                        "RO_DB_PORT": 3306,
+                        "RO_DB_OVIM_PORT": 3306,
+                        "RO_DB_USER": "mano",
+                        "RO_DB_OVIM_USER": "mano",
+                        "RO_DB_PASSWORD": "manopw",
+                        "RO_DB_OVIM_PASSWORD": "manopw",
+                        "RO_DB_ROOT_PASSWORD": "rootmanopw",
+                        "RO_DB_OVIM_ROOT_PASSWORD": "rootmanopw",
+                        "RO_DB_NAME": "mano_db",
+                        "RO_DB_OVIM_NAME": "mano_vim_db",
+                        "OPENMANO_TENANT": "osm",
+                    },
+                    "kubernetes": {
+                        "startupProbe": {
+                            "exec": {"command": ["/usr/bin/pgrep", "python3"]},
+                            "initialDelaySeconds": 60,
+                            "timeoutSeconds": 5,
+                        },
+                        "readinessProbe": {
+                            "httpGet": {
+                                "path": "/openmano/tenants",
+                                "port": 9090,
+                            },
+                            "periodSeconds": 10,
+                            "timeoutSeconds": 5,
+                            "successThreshold": 1,
+                            "failureThreshold": 3,
+                        },
+                        "livenessProbe": {
+                            "httpGet": {
+                                "path": "/openmano/tenants",
+                                "port": 9090,
+                            },
+                            "initialDelaySeconds": 600,
+                            "periodSeconds": 10,
+                            "timeoutSeconds": 5,
+                            "successThreshold": 1,
+                            "failureThreshold": 3,
+                        },
+                    },
+                }
+            ],
+            "kubernetesResources": {"ingressResources": []},
+        }
+
+        self.harness.charm.on.start.emit()
+
+        # Initializing the mysql relation
+        relation_id = self.harness.add_relation("mysql", "mysql")
+        self.harness.add_relation_unit(relation_id, "mysql/0")
+        self.harness.update_relation_data(
+            relation_id,
+            "mysql/0",
+            {
+                "host": "mysql",
+                "port": 3306,
+                "user": "mano",
+                "password": "manopw",
+                "root_password": "rootmanopw",
+            },
+        )
+
+        # Verifying status
+        self.assertNotIsInstance(self.harness.charm.unit.status, BlockedStatus)
+
+        pod_spec, _ = self.harness.get_pod_spec()
+
+        self.assertDictEqual(expected_result, pod_spec)
+
+    def test_on_kafka_unit_relation_changed(self) -> NoReturn:
+        """Test to see if kafka relation is updated."""
+        self.harness.charm.on.start.emit()
+
+        relation_id = self.harness.add_relation("kafka", "kafka")
+        self.harness.add_relation_unit(relation_id, "kafka/0")
+        self.harness.update_relation_data(
+            relation_id,
+            "kafka/0",
+            {
+                "host": "kafka",
+                "port": 9090,
+            },
+        )
+
+        # Verifying status
+        self.assertIsInstance(self.harness.charm.unit.status, BlockedStatus)
+
+        # Verifying status message
+        self.assertGreater(len(self.harness.charm.unit.status.message), 0)
+        self.assertTrue(
+            self.harness.charm.unit.status.message.startswith("Waiting for ")
+        )
+        self.assertIn("mongodb", self.harness.charm.unit.status.message)
+        self.assertTrue(self.harness.charm.unit.status.message.endswith(" relation"))
+
+    def test_on_mongodb_unit_relation_changed(self) -> NoReturn:
+        """Test to see if mongodb relation is updated."""
+        self.harness.charm.on.start.emit()
+
+        relation_id = self.harness.add_relation("mongodb", "mongodb")
+        self.harness.add_relation_unit(relation_id, "mongodb/0")
+        self.harness.update_relation_data(
+            relation_id,
+            "mongodb/0",
+            {
+                "connection_string": "mongodb://mongo",
+            },
+        )
+
+        # Verifying status
+        self.assertIsInstance(self.harness.charm.unit.status, BlockedStatus)
+
+        # Verifying status message
+        self.assertGreater(len(self.harness.charm.unit.status.message), 0)
+        self.assertTrue(
+            self.harness.charm.unit.status.message.startswith("Waiting for ")
+        )
+        self.assertIn("kafka", self.harness.charm.unit.status.message)
+        self.assertTrue(self.harness.charm.unit.status.message.endswith(" relation"))
+
+    def test_on_mysql_unit_relation_changed(self) -> NoReturn:
+        """Test to see if mysql relation is updated."""
+        self.harness.charm.on.start.emit()
+
+        relation_id = self.harness.add_relation("mysql", "mysql")
+        self.harness.add_relation_unit(relation_id, "mysql/0")
+        self.harness.update_relation_data(
+            relation_id,
+            "mysql/0",
+            {
+                "host": "mysql",
+                "port": 3306,
+                "user": "mano",
+                "password": "manopw",
+                "root_password": "rootmanopw",
+            },
+        )
+
+        # Verifying status
+        self.assertIsInstance(self.harness.charm.unit.status, BlockedStatus)
+
+        # Verifying status message
+        self.assertGreater(len(self.harness.charm.unit.status.message), 0)
+        self.assertTrue(
+            self.harness.charm.unit.status.message.startswith("Waiting for ")
+        )
+        self.assertIn("kafka", self.harness.charm.unit.status.message)
+        self.assertIn("mongodb", self.harness.charm.unit.status.message)
+        self.assertTrue(self.harness.charm.unit.status.message.endswith(" relations"))
+
+    def test_publish_ro_info(self) -> NoReturn:
+        """Test to see if ro relation is updated."""
+        expected_result = {
+            "host": "ro",
+            "port": "9090",
+        }
+
+        self.harness.charm.on.start.emit()
+
+        relation_id = self.harness.add_relation("ro", "lcm")
+        self.harness.add_relation_unit(relation_id, "lcm/0")
+        relation_data = self.harness.get_relation_data(relation_id, "ro")
+
+        self.assertDictEqual(expected_result, relation_data)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/installers/charm/ro/tests/test_pod_spec.py b/installers/charm/ro/tests/test_pod_spec.py
new file mode 100644
index 0000000..2dc1104
--- /dev/null
+++ b/installers/charm/ro/tests/test_pod_spec.py
@@ -0,0 +1,389 @@
+#!/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
+
+import pod_spec
+
+
+class TestPodSpec(unittest.TestCase):
+    """Pod spec unit tests."""
+
+    def test_make_pod_ports(self) -> NoReturn:
+        """Testing make pod ports."""
+        port = 9090
+
+        expected_result = [
+            {
+                "name": "ro",
+                "containerPort": port,
+                "protocol": "TCP",
+            }
+        ]
+
+        pod_ports = pod_spec._make_pod_ports(port)
+
+        self.assertListEqual(expected_result, pod_ports)
+
+    def test_make_pod_envconfig_ng_ro(self) -> NoReturn:
+        """Teting make pod envconfig."""
+        config = {
+            "enable_ng_ro": True,
+            "database_commonkey": "osm",
+            "log_level": "INFO",
+        }
+        relation_state = {
+            "kafka_host": "kafka",
+            "kafka_port": 9090,
+            "mongodb_connection_string": "mongodb://mongo",
+        }
+
+        expected_result = {
+            "OSMRO_LOG_LEVEL": config["log_level"],
+            "OSMRO_MESSAGE_DRIVER": "kafka",
+            "OSMRO_MESSAGE_HOST": relation_state["kafka_host"],
+            "OSMRO_MESSAGE_PORT": relation_state["kafka_port"],
+            "OSMRO_DATABASE_DRIVER": "mongo",
+            "OSMRO_DATABASE_URI": relation_state["mongodb_connection_string"],
+            "OSMRO_DATABASE_COMMONKEY": config["database_commonkey"],
+        }
+
+        pod_envconfig = pod_spec._make_pod_envconfig(config, relation_state)
+
+        self.assertDictEqual(expected_result, pod_envconfig)
+
+    def test_make_pod_envconfig_no_ng_ro(self) -> NoReturn:
+        """Teting make pod envconfig."""
+        config = {
+            "log_level": "INFO",
+            "enable_ng_ro": False,
+            "vim_database": "mano_vim_db",
+            "ro_database": "mano_db",
+            "openmano_tenant": "osm",
+        }
+        relation_state = {
+            "mysql_host": "mysql",
+            "mysql_port": 3306,
+            "mysql_user": "mano",
+            "mysql_password": "manopw",
+            "mysql_root_password": "rootmanopw",
+        }
+
+        expected_result = {
+            "OSMRO_LOG_LEVEL": config["log_level"],
+            "RO_DB_HOST": relation_state["mysql_host"],
+            "RO_DB_OVIM_HOST": relation_state["mysql_host"],
+            "RO_DB_PORT": relation_state["mysql_port"],
+            "RO_DB_OVIM_PORT": relation_state["mysql_port"],
+            "RO_DB_USER": relation_state["mysql_user"],
+            "RO_DB_OVIM_USER": relation_state["mysql_user"],
+            "RO_DB_PASSWORD": relation_state["mysql_password"],
+            "RO_DB_OVIM_PASSWORD": relation_state["mysql_password"],
+            "RO_DB_ROOT_PASSWORD": relation_state["mysql_root_password"],
+            "RO_DB_OVIM_ROOT_PASSWORD": relation_state["mysql_root_password"],
+            "RO_DB_NAME": config["ro_database"],
+            "RO_DB_OVIM_NAME": config["vim_database"],
+            "OPENMANO_TENANT": config["openmano_tenant"],
+        }
+
+        pod_envconfig = pod_spec._make_pod_envconfig(config, relation_state)
+
+        self.assertDictEqual(expected_result, pod_envconfig)
+
+    def test_make_startup_probe(self) -> NoReturn:
+        """Testing make startup probe."""
+        expected_result = {
+            "exec": {"command": ["/usr/bin/pgrep", "python3"]},
+            "initialDelaySeconds": 60,
+            "timeoutSeconds": 5,
+        }
+
+        startup_probe = pod_spec._make_startup_probe()
+
+        self.assertDictEqual(expected_result, startup_probe)
+
+    def test_make_readiness_probe(self) -> NoReturn:
+        """Testing make readiness probe."""
+        port = 9090
+
+        expected_result = {
+            "httpGet": {
+                "path": "/openmano/tenants",
+                "port": port,
+            },
+            "periodSeconds": 10,
+            "timeoutSeconds": 5,
+            "successThreshold": 1,
+            "failureThreshold": 3,
+        }
+
+        readiness_probe = pod_spec._make_readiness_probe(port)
+
+        self.assertDictEqual(expected_result, readiness_probe)
+
+    def test_make_liveness_probe(self) -> NoReturn:
+        """Testing make liveness probe."""
+        port = 9090
+
+        expected_result = {
+            "httpGet": {
+                "path": "/openmano/tenants",
+                "port": port,
+            },
+            "initialDelaySeconds": 600,
+            "periodSeconds": 10,
+            "timeoutSeconds": 5,
+            "successThreshold": 1,
+            "failureThreshold": 3,
+        }
+
+        liveness_probe = pod_spec._make_liveness_probe(port)
+
+        self.assertDictEqual(expected_result, liveness_probe)
+
+    def test_make_pod_spec_ng_ro(self) -> NoReturn:
+        """Testing make pod spec."""
+        image_info = {"upstream-source": "opensourcemano/ro:8"}
+        config = {
+            "database_commonkey": "osm",
+            "log_level": "INFO",
+            "enable_ng_ro": True,
+        }
+        relation_state = {
+            "kafka_host": "kafka",
+            "kafka_port": 9090,
+            "mongodb_connection_string": "mongodb://mongo",
+        }
+        app_name = "ro"
+        port = 9090
+
+        expected_result = {
+            "version": 3,
+            "containers": [
+                {
+                    "name": app_name,
+                    "imageDetails": image_info,
+                    "imagePullPolicy": "Always",
+                    "ports": [
+                        {
+                            "name": app_name,
+                            "containerPort": port,
+                            "protocol": "TCP",
+                        }
+                    ],
+                    "envConfig": {
+                        "OSMRO_LOG_LEVEL": config["log_level"],
+                        "OSMRO_MESSAGE_DRIVER": "kafka",
+                        "OSMRO_MESSAGE_HOST": relation_state["kafka_host"],
+                        "OSMRO_MESSAGE_PORT": relation_state["kafka_port"],
+                        "OSMRO_DATABASE_DRIVER": "mongo",
+                        "OSMRO_DATABASE_URI": relation_state[
+                            "mongodb_connection_string"
+                        ],
+                        "OSMRO_DATABASE_COMMONKEY": config["database_commonkey"],
+                    },
+                    "kubernetes": {
+                        "startupProbe": {
+                            "exec": {"command": ["/usr/bin/pgrep", "python3"]},
+                            "initialDelaySeconds": 60,
+                            "timeoutSeconds": 5,
+                        },
+                        "readinessProbe": {
+                            "httpGet": {
+                                "path": "/openmano/tenants",
+                                "port": port,
+                            },
+                            "periodSeconds": 10,
+                            "timeoutSeconds": 5,
+                            "successThreshold": 1,
+                            "failureThreshold": 3,
+                        },
+                        "livenessProbe": {
+                            "httpGet": {
+                                "path": "/openmano/tenants",
+                                "port": port,
+                            },
+                            "initialDelaySeconds": 600,
+                            "periodSeconds": 10,
+                            "timeoutSeconds": 5,
+                            "successThreshold": 1,
+                            "failureThreshold": 3,
+                        },
+                    },
+                }
+            ],
+            "kubernetesResources": {"ingressResources": []},
+        }
+
+        spec = pod_spec.make_pod_spec(
+            image_info, config, relation_state, app_name, port
+        )
+
+        self.assertDictEqual(expected_result, spec)
+
+    def test_make_pod_spec_no_ng_ro(self) -> NoReturn:
+        """Testing make pod spec."""
+        image_info = {"upstream-source": "opensourcemano/ro:8"}
+        config = {
+            "log_level": "INFO",
+            "enable_ng_ro": False,
+            "vim_database": "mano_vim_db",
+            "ro_database": "mano_db",
+            "openmano_tenant": "osm",
+        }
+        relation_state = {
+            "mysql_host": "mysql",
+            "mysql_port": 3306,
+            "mysql_user": "mano",
+            "mysql_password": "manopw",
+            "mysql_root_password": "rootmanopw",
+        }
+        app_name = "ro"
+        port = 9090
+
+        expected_result = {
+            "version": 3,
+            "containers": [
+                {
+                    "name": app_name,
+                    "imageDetails": image_info,
+                    "imagePullPolicy": "Always",
+                    "ports": [
+                        {
+                            "name": app_name,
+                            "containerPort": port,
+                            "protocol": "TCP",
+                        }
+                    ],
+                    "envConfig": {
+                        "OSMRO_LOG_LEVEL": config["log_level"],
+                        "RO_DB_HOST": relation_state["mysql_host"],
+                        "RO_DB_OVIM_HOST": relation_state["mysql_host"],
+                        "RO_DB_PORT": relation_state["mysql_port"],
+                        "RO_DB_OVIM_PORT": relation_state["mysql_port"],
+                        "RO_DB_USER": relation_state["mysql_user"],
+                        "RO_DB_OVIM_USER": relation_state["mysql_user"],
+                        "RO_DB_PASSWORD": relation_state["mysql_password"],
+                        "RO_DB_OVIM_PASSWORD": relation_state["mysql_password"],
+                        "RO_DB_ROOT_PASSWORD": relation_state["mysql_root_password"],
+                        "RO_DB_OVIM_ROOT_PASSWORD": relation_state[
+                            "mysql_root_password"
+                        ],
+                        "RO_DB_NAME": config["ro_database"],
+                        "RO_DB_OVIM_NAME": config["vim_database"],
+                        "OPENMANO_TENANT": config["openmano_tenant"],
+                    },
+                    "kubernetes": {
+                        "startupProbe": {
+                            "exec": {"command": ["/usr/bin/pgrep", "python3"]},
+                            "initialDelaySeconds": 60,
+                            "timeoutSeconds": 5,
+                        },
+                        "readinessProbe": {
+                            "httpGet": {
+                                "path": "/openmano/tenants",
+                                "port": port,
+                            },
+                            "periodSeconds": 10,
+                            "timeoutSeconds": 5,
+                            "successThreshold": 1,
+                            "failureThreshold": 3,
+                        },
+                        "livenessProbe": {
+                            "httpGet": {
+                                "path": "/openmano/tenants",
+                                "port": port,
+                            },
+                            "initialDelaySeconds": 600,
+                            "periodSeconds": 10,
+                            "timeoutSeconds": 5,
+                            "successThreshold": 1,
+                            "failureThreshold": 3,
+                        },
+                    },
+                }
+            ],
+            "kubernetesResources": {"ingressResources": []},
+        }
+
+        spec = pod_spec.make_pod_spec(
+            image_info, config, relation_state, app_name, port
+        )
+
+        self.assertDictEqual(expected_result, spec)
+
+    def test_make_pod_spec_without_image_info(self) -> NoReturn:
+        """Testing make pod spec without image_info."""
+        image_info = None
+        config = {
+            "enable_ng_ro": True,
+            "database_commonkey": "osm",
+            "log_level": "INFO",
+        }
+        relation_state = {
+            "kafka_host": "kafka",
+            "kafka_port": 9090,
+            "mongodb_connection_string": "mongodb://mongo",
+        }
+        app_name = "ro"
+        port = 9090
+
+        spec = pod_spec.make_pod_spec(
+            image_info, config, relation_state, app_name, port
+        )
+
+        self.assertIsNone(spec)
+
+    def test_make_pod_spec_without_config(self) -> NoReturn:
+        """Testing make pod spec without config."""
+        image_info = {"upstream-source": "opensourcemano/ro:8"}
+        config = {}
+        relation_state = {
+            "kafka_host": "kafka",
+            "kafka_port": 9090,
+            "mongodb_connection_string": "mongodb://mongo",
+        }
+        app_name = "ro"
+        port = 9090
+
+        with self.assertRaises(ValueError):
+            pod_spec.make_pod_spec(image_info, config, relation_state, app_name, port)
+
+    def test_make_pod_spec_without_relation_state(self) -> NoReturn:
+        """Testing make pod spec without relation_state."""
+        image_info = {"upstream-source": "opensourcemano/ro:8"}
+        config = {
+            "enable_ng_ro": True,
+            "database_commonkey": "osm",
+            "log_level": "INFO",
+        }
+        relation_state = {}
+        app_name = "ro"
+        port = 9090
+
+        with self.assertRaises(ValueError):
+            pod_spec.make_pod_spec(image_info, config, relation_state, app_name, port)
+
+
+if __name__ == "__main__":
+    unittest.main()