Unit test: Add message in test_wp_mail_sends_attachments_with_*()
#3856
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Trac ticket: https://core.trac.wordpress.org/ticket/28407
Props to @costdev as he raised it on Slack channel
This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.