diff --git a/.travis.yml b/.travis.yml
index e05159b..908ebe4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -36,7 +36,8 @@ script:
     && (echo 'Idempotence test: pass' && exit 0)
     || (echo 'Idempotence test: fail' && exit 1)
 
-  # TODO: Test whether Docker is running correctly.
+  # Test whether Docker is running correctly (Dockerception!).
+  - docker exec --tty "$(cat ${container_id})" docker run hello-world
 
 notifications:
   webhooks: https://galaxy.ansible.com/api/v1/notifications/