Add tests around the loader-metadata chart

Refs. swh/infra/sysadm-environment#4794

swh/tests/loader_metadata_configmap_test.yaml

+suite: test loader_metadata configmap deployment
+templates:
+  - loader-metadata/configmap.yaml
+tests:
+  - it: loader-metadata configmap should be deployed when activated
+    # set:
+    #   loader_metadata.enabled: true
+    values:
+      - values/loader-metadata.yaml
+    asserts:
+      # - containsDocument:
+      #      kind: ConfigMap
+      #      apiVersion: v1
+      #      name: loader-metadata-utils
+      #      namespace: swh
+       - containsDocument:
+           kind: ConfigMap
+           apiVersion: v1
+           name: loader-metadata-template
+           namespace: swh
+        # not testable as there is a dot in the entry name
+        # - contains:
+        #     path: data.config.yml
+        #     content:
+        #       debug: false
+        #     count: 1
+  - it: loader metadata configmap namespace should be overridable
+    values:
+      - values/loader-metadata.yaml
+    set:
+      namespace: mynamespace
+    asserts:
+      - equal:
+          path: metadata.namespace
+          value: mynamespace
+      - hasDocuments:
+          count: 1
+  - it: loader metadata configmap absent when not activated
+    set:
+      loader_metadata.enabled: false
+    asserts:
+      - hasDocuments:
+          count: 0

swh/tests/loader_metadata_configmap_utils_test.yaml

+suite: test loader_metadata configmap utils deployment
+templates:
+  - loader-metadata/configmap-utils.yaml
+tests:
+  - it: loader-metadata configmap utils should be deployed when activated
+    values:
+      - values/loader-metadata.yaml
+    asserts:
+      - containsDocument:
+           kind: ConfigMap
+           apiVersion: v1
+           name: loader-metadata-utils
+           namespace: swh
+  - it: loader metadata configmap utils namespace should be overridable
+    values:
+      - values/loader-metadata.yaml
+    set:
+      namespace: mynamespace
+    asserts:
+      - equal:
+          path: metadata.namespace
+          value: mynamespace
+      - hasDocuments:
+          count: 1
+  - it: loader metadata configmap utils absent when not activated
+    set:
+      loader_metadata.enabled: false
+    asserts:
+      - hasDocuments:
+          count: 0

swh/tests/loader_metadata_deployment_test.yaml

+suite: test loader_metadata deployment
+templates:
+  - loader-metadata/configmap.yaml
+  - loader-metadata/configmap-utils.yaml
+  - loader-metadata/deployment.yaml
+tests:
+  - it: Loader metadata deployment should be deployed with default values
+    templates:
+      - loader-metadata/deployment.yaml
+    values:
+      - ./values/loader-metadata.yaml
+    asserts:
+      - containsDocument:
+          kind: Deployment
+          apiVersion: apps/v1
+          namespace: swh
+          name: loader-metadata
+      - lengthEqual:
+          path: spec.template.spec.containers
+          count: 1
+      - equal:
+          path: spec.template.spec.containers[?(@.name == "loader_metadata")].image
+          value: image:version
+      - equal:
+          path: spec.template.spec.containers[?(@.name == "loader_metadata")].env[?(@.name == "LOGLEVEL")].value
+          value: INFO
+      - equal:
+          path: spec.template.spec.containers[?(@.name == "loader_metadata")].env[?(@.name == "SWH_SENTRY_ENVIRONMENT")].value
+          value: production
+      - isNull:
+          path: spec.template.spec.containers[?(@.name == "loader_metadata")].env[?(@.name == "SWH_MAIN_PACKAGE")].value
+      - equal:
+          path: spec.template.spec.containers[?(@.name == "loader_metadata")].env[?(@.name == "SWH_SENTRY_DSN")].valueFrom.secretKeyRef.name
+          value: common-secrets
+      - equal:
+          path: spec.template.spec.containers[?(@.name == "loader_metadata")].env[?(@.name == "SWH_SENTRY_DSN")].valueFrom.secretKeyRef.key
+          value: loader-metadata-sentry-dsn

swh/tests/loader_metadata_global_test.yaml

+suite: test global loader metadata deployment
+templates:
+  - loader-metadata/deployment.yaml
+  - loader-metadata/configmap.yaml
+  - loader-metadata/configmap-utils.yaml
+  - loader-metadata/keda-autoscaling.yaml
+tests:
+  - it: Metadata Loader is not deployed by default
+    values:
+      - ../values.yaml
+    asserts:
+      - hasDocuments:
+          count: 0

swh/tests/values/loader-metadata.yaml

+loader_metadata:
+  enabled: true
+  storage:
+    host: storage.test.org
+    port: 2005
+  scheduler:
+    host: scheduler.test.org
+    port: 8005
+  consumerGroup: test.loader_metadata.journal_client
+  prefix: test.journal.objects
+  journalBrokers:
+    hosts:
+      - journal.test.org
+    user: ""
+  autoScaling:
+    maxReplicaCount: 2
+
+swh_loader_metadata_image: image
+swh_loader_metadata_image_version: version