diff --git a/molecule/default/molecule.yml b/molecule/default/molecule.yml
index 6189242..39df0e5 100644
--- a/molecule/default/molecule.yml
+++ b/molecule/default/molecule.yml
@@ -132,5 +132,6 @@ scenario:
     - create
     - prepare
     - converge
+    - idempotence
     - cleanup
     - destroy
\ No newline at end of file
diff --git a/tasks/apt.yml b/tasks/apt.yml
index 948a8f6..6d92860 100644
--- a/tasks/apt.yml
+++ b/tasks/apt.yml
@@ -1,4 +1,9 @@
 ---
+- name: Check if apt config file exists
+  stat:
+    path: /etc/apt/apt.conf.d/proxy.conf
+  register: stat_result
+
 - name: Create apt config file
   file:
     path: /etc/apt/apt.conf.d/proxy.conf
@@ -6,6 +11,7 @@
     mode: 0600
   when:
     - ansible_pkg_mgr == "apt"
+    - not stat_result.stat.exists
 
 - name: Ensure HTTP Proxy server is in apt.conf
   lineinfile: