Wait should work for deployments when replicas is 0

molecule/default/tasks/waiter.yml

@@ -244,6 +244,30 @@
           - deploy.result.status.availableReplicas == deploy.result.status.replicas
           - updated_deploy_pods.resources[0].spec.containers[0].image.endswith(":2")
 
+    - name: scale a deployment to 0 replicas
+      k8s:
+        definition:
+          apiVersion: apps/v1
+          kind: Deployment
+          metadata:
+            name: wait-deploy
+            namespace: "{{ wait_namespace }}"
+          spec:
+            replicas: 0
+            selector:
+              matchLabels:
+                app: "{{ k8s_pod_name }}"
+            template: "{{ k8s_pod_template }}"
+        wait: yes
+      vars:
+        k8s_pod_name: wait-deploy
+        k8s_pod_image: gcr.io/kuar-demo/kuard-amd64:2
+        k8s_pod_ports:
+          - containerPort: 8080
+            name: http
+            protocol: TCP
+      register: scale_down_deploy
+
     - name: Pause a deployment
       k8s:
         definition:

plugins/module_utils/raw.py

@@ -462,7 +462,8 @@ def wait(self, resource, definition, sleep, timeout, state='present', condition=
         def _deployment_ready(deployment):
             # FIXME: frustratingly bool(deployment.status) is True even if status is empty
             # Furthermore deployment.status.availableReplicas == deployment.status.replicas == None if status is empty
-            return (deployment.status and deployment.status.replicas is not None and
+            # deployment.status.replicas is None is perfectly ok if desired replicas == 0
+            return (deployment.status and
                     deployment.status.availableReplicas == deployment.status.replicas and
                     deployment.status.observedGeneration == deployment.metadata.generation and
                     not deployment.status.unAvailableReplicas)