yum: fix reporting group changes in check_mode (#28331)

test/integration/targets/yum/tasks/yum.yml

@@ -255,7 +255,7 @@
     state: present
   register: yum_result
 
-- name: verify nothing changed
+- name: verify sos is installed
   assert:
     that:
         - "yum_result.rc == 0"
@@ -269,6 +269,25 @@
         - "'rc' in yum_result"
         - "'results' in yum_result"
 
+- name: try to install the group again, with --check to check 'changed'
+  yum:
+    name: "@Development Tools"
+    state: present
+  check_mode: yes
+  register: yum_result
+
+- name: verify nothing changed
+  assert:
+    that:
+        - "not yum_result.changed"
+
+- name: verify yum module outputs
+  assert:
+    that:
+        - "'changed' in yum_result"
+        - "'msg' in yum_result"
+        - "'results' in yum_result"
+
 - name: try to install non existing group
   yum:
     name: "@non-existing-group"