Add a test for removal of at command

tests/integration/targets/at/aliases

@@ -1,3 +1,2 @@
 shippable/posix/group1
 destructive
-disabled # fixme package

tests/integration/targets/at/tasks/main.yml

@@ -60,3 +60,28 @@
       - 'at_test0.script_file is defined'
       - 'at_test0.state is defined'
       - 'at_test0.units is defined'
+
+- name: add a at useless command
+  at:
+    command: /bin/logger 'AT task ran from Ansible'
+    count: 1
+    units: minutes
+    unique: yes
+  register: at_add
+
+- debug var=at_add
+
+- name: pause, giving the time the at runs once
+  pause:
+    minutes: 1
+
+- name: add a at useless command
+  at:
+    command: /bin/logger 'AT task ran from Ansible'
+    count: 1
+    units: minutes
+    unique: yes
+    state: absent
+  register: at_removal
+
+- debug var=at_removal