Allow app bundle integration tests to check the content of sent emails

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.0.X EE, Master
• Component/s: Testing > Arquillian, Testing > Plugins, Testing > Portal
• Labels:
  • QA-AUTOMATION
  • fw_test_integration
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Priority Level: Low
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/49854

Sometimes, we need to test if a method sent a specific email. Right now, portal-test-integration has an exported class named com.liferay.portal.test.util.MailServiceTestUtil that allows us to get sent messages. However, these messages are instances from com.dumbster.smtp.MailMessage, a exported yet private class from portal-test-integration. Since it is private, we cannot create references to these objects with the correct type and so we cannot call methods from these objects, from modules.

We need a way to get mail message objects and assert their values.