Disk Diagnostics won't work...

Hello.
I'm on a MacBook Air - 2014 which brought installed OS X Mavericks 10.9.4.
The day after buying it, I installed OS X Yosemite. Then I erased it's SDD! I installed OS X Yosemite again, via internet!
Apple Disc Diagnostics doesn't work! I used every information I could obtain from Apple's website, but it still soonest work! Not by pressing 'D' will my Mac boots.
I created a partition and installed OS X Mavericks 10.9.5. I decided to use Disk Diagnostics with it, but still it didn't work!
Could this be a bug?! If yes, how could I repair it? I don't have any problem with my Mac, I just wanted to use Disk Diagnostics for the first time!
Thank you for any help you may give me.
All the best.

These are the Apple instructions:
http://support.apple.com/en-us/HT5781
As a guess, try booting the MBA holding the OPTION+D keys.  It may work, it may not.
An Apple store genius bar appointment is the best option id you cannot get it to work.
Ciao.

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