diff --git a/tox.ini b/tox.ini
index cc5b2ef11..bc90ae528 100644
--- a/tox.ini
+++ b/tox.ini
@@ -256,6 +256,11 @@ commands=
       ireallymeanit=yes \
       delegate_facts_host={env:DELEGATE_FACTS_HOST:True} \
   "
+  # idempotency test
+  ansible-playbook -vv -i {changedir}/{env:INVENTORY} {toxinidir}/infrastructure-playbooks/cephadm-adopt.yml --extra-vars "\
+      ireallymeanit=yes \
+      delegate_facts_host={env:DELEGATE_FACTS_HOST:True} \
+  "
 
 [testenv]
 whitelist_externals =