Debian 8: mdadm mail test problem

[^rooker]

[PROBLEM]
I've setup my /etc/mdadm/mdadm.conf to send mails to my email-address if problems with the SoftRAID occur.
According to documentation found online, the following command should cause mdadm to send a test e-mail:

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$ mdadm --monitor --scan --test

But in my case it replies:

mdadm: Only one autorebuild process allowed in scan mode, aborting

[SOLUTION]
The command was wrong.
Use this one instead:

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$ mdadm --monitor --scan --test --oneshot

Another mystery solved!