Add more tests

tests/integration/targets/test_mysql_user/tasks/test_user_plugin_auth.yml

@@ -581,6 +581,7 @@
 
         - name: Plugin auth | Connect with user and password
           ansible.builtin.command: '{{ mysql_command }} -u {{ test_user_name }} -p{{ test_plugin_auth_string }} -e "SELECT 1"'
+          changed_when: false
 
         - name: Plugin auth | Change auth user plugin in check mode
           community.mysql.mysql_user:
@@ -636,3 +637,25 @@
           vars:
             user_name: "{{ test_user_name }}"
             plugin_type: caching_sha2_password
+
+        - name: Plugin auth | Change user password
+          community.mysql.mysql_user:
+            <<: *mysql_params
+            name: "{{ test_user_name }}"
+            host: '%'
+            plugin: caching_sha2_password
+            plugin_auth_string: newpass
+            salt: "{{ test_salt }}"
+            priv: "{{ test_default_priv }}"
+          register: result
+          failed_when: result is not changed
+
+        - name: Plugin auth | Connect with user and password
+          ansible.builtin.command: '{{ mysql_command }} -u {{ test_user_name }} -pnewpass -e "SELECT 1"'
+          changed_when: false
+
+        - name: Plugin auth | Check that the expected plugin type is set after change
+          ansible.builtin.include_tasks: utils/assert_plugin.yml
+          vars:
+            user_name: "{{ test_user_name }}"
+            plugin_type: caching_sha2_password