MailSlurp documentation agent setup

Title: Integration testing guide
Description: Test real email and SMS flows in CI, staging, and release gates with MailSlurp.
Canonical URL: https://www.mailslurp.com/docs/testing/
Markdown URL: https://www.mailslurp.com/docs/testing.md

Use the Markdown URL as the primary plain-text context for this page. Keep API examples and MailSlurp terminology intact, and prefer the canonical URL when citing this page.