SQL Server Alerts (notify operator when job failed) I setup database mail, created an operator today and enable notify operator when job failed.

Is that all or do I need to create an alert too?

My boss just needs emails if any job failed.

Also how to test it to see it will work in the future?

Thanks
Regarding the status of job run, that's the correct steps.

However, its recommended you configure the alerts for any database corruption, HW/SW failures or any other cause for an outage. Read here to configure the same.

In order to test, create a TEST job and purposefully make it fail and see if you receive the failure notification email or not.