Use a temporary file and cleanup at the end.

XXX we must use delegate_to: localhost instead of hosts: localhost
because of the braindamaged localhost group.

tests/tests_default_wrapper.yml

@@ -1,19 +1,34 @@
-
+---
 - name: Create static inventory from hostvars
   hosts: all
   tasks:
+    - name: create temporary file
+      tempfile:
+        state: file
+        suffix: .inventory.yaml
+      register: tempinventory
+      delegate_to: localhost
+
     - name: Create static inventory from hostvars
       template:
         src: inventory.yaml.j2
-        dest: inventory.yaml
+        dest: "{{ tempinventory.path }}"
       delegate_to: localhost
 
+
 - name: Run tests_default.yml normally
   import_playbook: tests_default.yml
 
 - name: Run tests_default.yml in check_mode
   hosts: all
   tasks:
     - name: Run ansible-playbook with tests_default.yml in check mode
-      command: ansible-playbook -vvv -i inventory.yaml --check tests_default.yml
+      command: ansible-playbook -vvv -i {{ tempinventory.path }} --check tests_default.yml
+      delegate_to: localhost
+
+    - name: remove the temporary file
+      file:
+        path: "{{ tempinventory.path }}"
+        state: absent
+      when: tempinventory.path is defined
       delegate_to: localhost