Test include_vars reserved variable matching (#84678)

* Add test case for include_vars

* Revise test to catch erroneous warnings

test/integration/targets/var_reserved/tasks/include_vars.yml

@@ -0,0 +1,5 @@
+- hosts: localhost
+  gather_facts: no
+  tasks:
+  - include_vars:
+      file: ../vars/set_host_variable.yml

test/integration/targets/var_reserved/tasks/main.yml

@@ -2,22 +2,32 @@
   vars:
     canary: Found variable using reserved name
   block:
-  - shell: ansible-playbook '{{[ role_path, "tasks", item ~ ".yml"] | path_join }}'
+  - shell: ansible-playbook '{{[ role_path, "tasks", item.file ~ ".yml"] | path_join }}'
     environment:
       ANSIBLE_LOCALHOST_WARNING: 0
+      ANSIBLE_FORCE_COLOR: 0
     failed_when: false
     loop:
-    - play_vars
-    - block_vars
-    - task_vars
-    - task_vars_used
-    - set_fact
+    - file: play_vars
+      name: lipsum
+    - file: block_vars
+      name: query
+    - file: task_vars
+      name: query
+    - file: task_vars_used
+      name: q
+    - file: set_fact
+      name: lookup
+    - file: include_vars
+      name: query
     register: play_out
 
   - name: check they all complain about bad defined var
     assert:
       that:
-        - canary in item['stderr']
+        - item.stderr == warning_message
     loop: '{{play_out.results}}'
     loop_control:
-      label: '{{item.item}}'
+      label: '{{item.item.file}}'
+    vars:
+      warning_message: "[WARNING]: {{ canary }}: {{ item.item.name }}"

test/integration/targets/var_reserved/vars/set_host_variable.yml

@@ -0,0 +1 @@
+query: overwrite global Jinja2 function