Marketing-tags app has been migrated some time ago. 
The old version had a UI test it.info.magnolia.eeintegrationtests.uitest.MarketingTagsAppUITest. 
Now a couple of all the tests of this old test-class fail.

Instead of re-implementing or fix these old tests - we rather define scenarios properly, then we implement the tests with new test-fwk.

Please read https://wiki.magnolia-cms.com/display/DEV/The+process+of+creating+int.+and+functional+tests+-+simplified about how to specify scenarios in case you don't know.