Function send_test 

pub async fn send_test(pool: &PgPool, actor: &Actor) -> AppResult<()>

Sends a test notification to the actor (checks e-mail and Mattermost).

Invariants

• Permission: any signed-in actor; the actor is the only recipient.
• Locks: none.
• Data: the test kind is delivered even if the actor muted kinds; e-mail and Mattermost delivery are queued per the actor’s settings.
• Audit: none.
• Webhooks: none.
• Atomic: one transaction.