Add basic unit test.
Add basic unit test.

Uncovers issue #2213.

audiokit/AudioKit,audiokit/AudioKit,adamnemecek/AudioKit,eljeff/AudioKit,adamnemecek/AudioKit,eljeff/AudioKit,audiokit/AudioKit,eljeff/AudioKit,eljeff/AudioKit,adamnemecek/AudioKit,adamnemecek/AudioKit,audiokit/AudioKit