Add test for python2.6 json bug to its own file

test/integration/roles/test_filters/tasks/main.yml

@@ -22,6 +22,9 @@
 
 - debug: var=some_registered_var
 
+- name: Verify that we workaround a py26 json bug
+  template: src=py26json.j2 dest={{output_dir}}/py26json.templated mode=0644
+
 - name: fill in a basic template
   template: src=foo.j2 dest={{output_dir}}/foo.templated mode=0644
   register: template_result

test/integration/roles/test_filters/templates/py26json.j2

+Provoke a python2.6 json bug
+{{ hostvars | to_nice_json }}