My iMac will not boot into the Apple Hard Ware test. Why is this?

I have a late 2012 27 inch iMac. It will not boot into the Apple Hard Ware test. I do have File Vault turned on. Will this stop it from booting in to the test?

See Using Apple Hardware Test. For some Apple computers that shipped with OS X Lion, if Apple Hardware Test cannot be found on the hard drive, an Internet-based version starts up instead. An Internet-enabled connection via ethernet or Wi-Fi is required to use this feature. Some computers that shipped with Lion require a software update to use this feature. See Computers that can be upgraded to use OS X Internet Recovery for more information.
Note: your machine cannot be running Mac OS X (10.6.7).
27" i7 iMac (Mid 2011) refurb, OS X Mavericks (10.9.4), ML & SL, G4 450 MP w/Leopard, 9.2.2

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