Share Email Facebook Twitter LinkedIn To Exit the Test Environment (AutoCAD Mechanical Toolset) Click Content Editor tabClose panelClose Test Content. Related Concepts About Testing Content (AutoCAD Mechanical Toolset) Related Tasks To Test the Content Being Edited (AutoCAD Mechanical Toolset)To Insert Another Instance of the Content Being Tested (AutoCAD Mechanical Toolset) Related Reference Commands for Authoring, Publishing and Distributing Content Libraries (AutoCAD Mechanical Toolset)