diff --git a/roles/xmpp_server/molecule/default/group_vars/parameters-optional.yml b/roles/xmpp_server/molecule/default/group_vars/parameters-optional.yml
new file mode 100644
index 0000000000000000000000000000000000000000..743e7ee86474d6e6123aebbe6d1c6eb8bec47172
--- /dev/null
+++ b/roles/xmpp_server/molecule/default/group_vars/parameters-optional.yml
@@ -0,0 +1,33 @@
+---
+
+xmpp_administrators:
+  - jane.doe@domain2
+  - mick.doe@domain3
+xmpp_domains:
+  - domain2
+  - domain3
+xmpp_ldap_base_dn: dc=local
+xmpp_ldap_password: prosodypassword
+xmpp_ldap_server: ldap-server
+xmpp_tls_certificate: "{{ lookup('file', 'tests/data/x509/parameters-optional_xmpp.cert.pem') }}"
+xmpp_tls_key: "{{ lookup('file', 'tests/data/x509/parameters-optional_xmpp.key.pem') }}"
+
+# Common parameters (general, not role).
+tls_certificate_dir: tests/data/x509/
+tls_private_key_dir: tests/data/x509/
+
+# common
+ca_certificates:
+  testca: "{{ lookup('file', 'tests/data/x509/ca.cert.pem') }}"
+
+# backup_client
+enable_backup: true
+backup_client_username: bak-parameters-optional
+backup_encryption_key: "{{ lookup('file', 'tests/data/gnupg/parameters-optional.asc') }}"
+backup_server: backup-server
+backup_server_host_ssh_public_keys:
+  - "{{ lookup('file', 'tests/data/ssh/server_dsa.pub') }}"
+  - "{{ lookup('file', 'tests/data/ssh/server_rsa.pub') }}"
+  - "{{ lookup('file', 'tests/data/ssh/server_ed25519.pub') }}"
+  - "{{ lookup('file', 'tests/data/ssh/server_ecdsa.pub') }}"
+backup_ssh_key: "{{ lookup('file', 'tests/data/ssh/parameters-optional' ) }}"