Is ATG Dust outdated or still in use?

Is ATG Dust outdated or still in use ? If YES, then where is the proper documentation ? I did not find it on the Oracle site. If NO, then what are the best alternatives ? How can we implement them to start up the Nucleus & initialize components ?

PS: I have around 4 years of experience in ATG Commerce, but haven't encountered its usage anywhere. We are currently working in ATG 10.x but still do not have an idea of how are we gonna unit test our applixation.

Thanks!!!