Great question. I'm assuming that the question here is about running tests in parallel on a single iOS device. If that is the case, then no, it is not currently possible to run tests in parallel on a single device. The reason for this is that unit tests run in the context of your app process, and iOS does not support launching multiple instances of the same app at the same time. Xcode needs at least one other device that it can launch your application on, in order to distribute the unit tests among the app instances (one per device).
ejvaughan
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