pip: Idempotency tests (#74473)

Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>
Co-authored-by: David Moreau Simard <dmsimard@redhat.com>

test/integration/targets/pip/tasks/pip.yml

@@ -310,18 +310,51 @@
       - "not (pip_install_empty is changed)"
 
 # https://github.com/ansible/ansible/issues/41043
+- block:
+    - name: Ensure previous virtualenv no longer exists
+      file:
+        state: absent
+        name: "{{ output_dir }}/pipenv"
+
     - name: do not consider an empty string as a version
       pip:
         name: q
         state: present
         version: ""
         virtualenv: "{{ output_dir }}/pipenv"
-  register: pip_install_empty_version_string
+      register: pip_empty_version_string
 
-- name: ensure that task installation did not fail
+    - name: test idempotency with empty string
+      pip:
+        name: q
+        state: present
+        version: ""
+        virtualenv: "{{ output_dir }}/pipenv"
+      register: pip_empty_version_string_idempotency
+
+    - name: test idempotency without empty string
+      pip:
+        name: q
+        state: present
+        virtualenv: "{{ output_dir }}/pipenv"
+      register: pip_no_empty_version_string_idempotency
+
+      # 'present' and version=="" is analogous to latest when first installed
+    - name: ensure we installed the latest version
+      pip:
+        name: q
+        state: latest
+        virtualenv: "{{ output_dir }}/pipenv"
+      register: pip_empty_version_idempotency
+
+    - name: ensure that installation worked and is idempotent
       assert:
         that:
-      - pip_install_empty_version_string is successful
+          - pip_empty_version_string is changed
+          - pip_empty_version_string is successful
+          - pip_empty_version_idempotency is not changed
+          - pip_no_empty_version_string_idempotency is not changed
+          - pip_empty_version_string_idempotency is not changed
 
 # test version specifiers
 - name: make sure no test_package installed now