kubernetes.core/molecule/default/tasks/json_patch.yml

- vars:
    namespace: json-patch
    pod: json-patch
    deployment: json-patch

  block:
    - name: Ensure namespace exists
      kubernetes.core.k8s:
        kind: namespace
        name: "{{ namespace }}"

    - name: Create a simple pod
      kubernetes.core.k8s:
        definition:
          apiVersion: v1
          kind: Pod
          metadata:
            namespace: "{{ namespace }}"
            name: "{{ pod }}"
            labels:
              label1: foo
          spec:
            containers:
              - image: busybox:musl
                name: busybox
                command:
                  - sh
                  - -c
                  - while true; do echo $(date); sleep 10; done
        wait: yes

    - name: Add a label and replace the image in checkmode
      kubernetes.core.k8s_json_patch:
        kind: Pod
        namespace: "{{ namespace }}"
        name: "{{ pod }}"
        patch:
          - op: add
            path: /metadata/labels/label2
            value: bar
          - op: replace
            path: /spec/containers/0/image
            value: busybox:glibc
      check_mode: yes
      register: result
      diff: yes

    - name: Assert patch was made
      assert:
        that:
          - result.changed
          - result.result.metadata.labels.label2 == "bar"
          - result.result.spec.containers[0].image == "busybox:glibc"
          - result.diff

    - name: Describe pod
      kubernetes.core.k8s_info:
        kind: Pod
        name: "{{ pod }}"
        namespace: "{{ namespace }}"
      register: result

    - name: Assert pod has not changed
      assert:
        that:
          - result.resources[0].metadata.labels.label2 is not defined
          - result.resources[0].spec.containers[0].image == "busybox:musl"

    - name: Add a label and replace the image
      kubernetes.core.k8s_json_patch:
        kind: Pod
        namespace: "{{ namespace }}"
        name: "{{ pod }}"
        patch:
          - op: add
            path: /metadata/labels/label2
            value: bar
          - op: replace
            path: /spec/containers/0/image
            value: busybox:glibc
      register: result

    - name: Assert patch was made
      assert:
        that:
          - result.changed
          - result.diff is not defined

    - name: Describe pod
      kubernetes.core.k8s_info:
        kind: Pod
        name: "{{ pod }}"
        namespace: "{{ namespace }}"
      register: result

    - name: Assert that both patch operations have been applied
      assert:
        that:
          - result.resources[0].metadata.labels.label2 == "bar"
          - result.resources[0].spec.containers[0].image == "busybox:glibc"

    - name: Apply the same patch to the pod
      kubernetes.core.k8s_json_patch:
        kind: Pod
        namespace: "{{ namespace }}"
        name: "{{ pod }}"
        patch:
          - op: add
            path: /metadata/labels/label2
            value: bar
          - op: replace
            path: /spec/containers/0/image
            value: busybox:glibc
      register: result

    - name: Assert that no changes were made
      assert:
        that:
          - not result.changed

    - name: Create a simple deployment
      kubernetes.core.k8s:
        wait: yes
        definition:
          apiVersion: apps/v1
          kind: Deployment
          metadata:
            namespace: "{{ namespace }}"
            name: "{{ deployment }}"
            labels:
              name: "{{ deployment }}"
          spec:
            replicas: 2
            selector:
              matchLabels:
                app: busybox
            template:
              metadata:
                labels:
                  app: busybox
              spec:
                containers:
                  - name: busybox
                    image: busybox
                    command:
                      - sh
                      - -c
                      - while true; do echo $(date); sleep 10; done

    - name: Apply patch and wait for deployment to be ready
      kubernetes.core.k8s_json_patch:
        kind: Deployment
        namespace: "{{ namespace }}"
        name: "{{ deployment }}"
        patch:
          - op: replace
            path: /spec/replicas
            value: 3
        wait: yes
      register: result

    - name: Assert all replicas are available
      assert:
        that:
          - result.result.status.availableReplicas == 3

  always:
    - name: Ensure namespace has been deleted
      kubernetes.core.k8s:
        kind: Namespace
        name: "{{ namespace }}"
        state: absent
      ignore_errors: yes