To verify that your Cloud Pub/Sub topic is receiving messages from your job:
- 
Invoke the following command:
 gcloud pubsub subscriptions pull cron-sub --limit 5
 
- 
View the results. You should see output that looks roughly like the following
 +-------------+----------------+------------+-----------------------------+
 | DATA        | MESSAGE_ID     | ATTRIBUTES | ACK_ID                      |
 +-------------+----------------+------------+-----------------------------+
 | hello cron! | 56344662920621 |            | EkwnGERJUytDCypYEU4EISE-... |
 +-------------+----------------+------------+-----------------------------+
 | hello cron! | 56340561244339 |            | EkwnGERJUytDCypYEU4EISE-... |
 +-------------+----------------+------------+-----------------------------+
 | hello cron! | 56340388879975 |            | EkwnGERJUytDCypYEU4EISE-... |
 +-------------+----------------+------------+-----------------------------+
 | hello cron! | 56337745052761 |            | EkwnGERJUytDCypYEU4EISE...  |
 +-------------+----------------+------------+-----------------------------+
 | hello cron! | 56337890896134 |            | EkwnGERJUytDCypYEU4EISE-... |
 +-------------+----------------+------------+-----------------------------+