GFCI not triggered after installing AFCI / GFCI breaker
GFCI plug in testers with a trip button won't work without some ground connection.  When the test button is depressed it is basically a high resistance leak to the ground pin, with no ground wire connected the test fails.

Specifically this type of device: 


Additionally: If the outlet is GFCI protected but has no ground it should be marked "GFCI protected No Equipment Ground" with the stickers that came with the device.