useless test....
not one picture taken with a lens cap on or in a pitch black room.... 
Absolutely
I'm thinking should I write an indignant post on here about how I am going to change to Nikon, or just demanding a full refund and replacement of every bit of kit I have ever bought off Canon.
So whats my problem? Well I saw a unicorn tap dancing but after composing the image, checking the ISO, checking it could not possibly be anything to do with a lack of skill on my part, I took the shot that was going to make me world famous, exceedingly rich and very attractive to women. However Canon have not put on a warning that you should remove the lens cap.

There was definitely grain visible in the image, but no unicorn!
I'm disgusted don't they realise that I have paid loads of dosh for a professional camera and I expect it to be fool proof?