This is to be placed at the end of a language article, in the same way as the {{InterWiki}} template is used now, but for test Wikipedias on Incubator. Type {{Incubator|code= languagecode}} for test Wikipedias. If the test is not a Wikipedia, add |project= projectname at the end (before the }}). If the language name is different to the name of the article, add |language= languagename. If the prefix begins with something other than Test-wp, add |prefix= prefixstart.