WP_UnitTestCase::knownPluginBug() – Skips the current test if there is an open plugin ticket with id $ticket_id
WP_UnitTestCase::knownUTBug() – Skips the current test if there is an open unit tests ticket with id $ticket_id
WP_UnitTestCase::knownWPBug() – Skips the current test if there is an open WordPress ticket with id $ticket_id