Test unpublished rules from your console if you use Akamai hosting.
The Switcher plugin is often the easiest way to test. See Search Discovery Plugins in the Dynamic Tag Management Product Documentation for more information.
Access your web console on your site and type
_satellite.setDebug(true), then press Enter.
Refresh the page.
This action loads your staging library and sets the debugger, so that you can see details of all available (published / unpublished) rules firing on the page.
When finished, run
localStorage.setItem('sdsat_stagingLibrary', false), then press Enter.