The BlackBerry Virtual Expert is a simple app from BlackBerry that lets you run various diagnostics on your device to test everything from the display to speakers to the keyboard. It looks like it's been available for a while and somehow flew under the radar, but it's also a very cool app.
It's available for BlackBerry 10 devices as well as most legacy devices and is totally free. When you start it up you're presented with a few screens that run you through the basics and tell you about the various tests. You can run display, audio or keyboard tests as well as checking the camera, headset plug, LED, SD card, speaker and pretty much everything else on your device.
The app is designed for those that may be having issues with a device but anyone can use it to check things out. After the tests you'll get a summary to read over and you can also send it along to BlackBerry should you want to.
The BlackBerry Virtual Expert app is available free in BlackBerry World.