Add tests for MimeType helpers#1999

swg-bsi wants to merge 1 commit intoeclipse-scout:releases/26.1eclipse-scout/scout.rt:releases/26.1from

swg-bsi:features/swg/26.1/mime_type_testsswg-bsi/scout.rt:features/swg/26.1/mime_type_testsCopy head branch name to clipboard