Fixed the missing "charset=utf-8" in content type in unittests.
Fixed the missing "charset=utf-8" in content type in unittests.

trigrass2/gmcadmin,imadige/gmcadmin,imadige/gmcadmin,trigrass2/gmcadmin,codeb2cc/gmcadmin,imadige/gmcadmin,trigrass2/gmcadmin,codeb2cc/gmcadmin