Adding integration tests for async fire-and-forget checking

Also updated the CHANGELOG for the feature

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

@@ -62,3 +62,28 @@
   async: 15
   poll: 0
   when: False
+
+# test async "fire and forget, but check later"
+
+- name: 'start a task with "fire-and-forget"'
+  command: sleep 15
+  async: 30
+  poll: 0
+  register: fnf_task
+
+- name: assert task was successfully started
+  assert:
+    that:
+    - fnf_task.started
+    - "'ansible_job_id' in fnf_task"
+
+- name: 'check on task started as a "fire-and-forget"'
+  async_status: jid={{ fnf_task.ansible_job_id }}
+  register: fnf_result
+  until: fnf_result.finished
+  retries: 30
+
+- name: assert task was successfully checked
+  assert:
+    that:
+    - fnf_result.finished